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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `src/common/function/src/scalars/json/json_get_rewriter.rs`."><title>json_get_rewriter.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Italic-81dc35de.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-MediumItalic-ccf7e434.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2"href="../../../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../../../static.files/rustdoc-17e0aaed.css"><meta name="rustdoc-vars" data-root-path="../../../../" data-static-root-path="../../../../static.files/" data-current-crate="common_function" data-themes="" data-resource-suffix="" data-rustdoc-version="1.96.0-nightly (ac7f9ec7d 2026-03-20)" data-channel="nightly" data-search-js="search-63369b7b.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../../../static.files/storage-41dd4d93.js"></script><script defer src="../../../../static.files/src-script-813739b1.js"></script><script defer src="../../../../src-files.js"></script><script defer src="../../../../static.files/main-5013f961.js"></script><noscript><link rel="stylesheet" href="../../../../static.files/noscript-f7c3ffd8.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../static.files/favicon-32x32-eab170b8.png"><link rel="icon" type="image/svg+xml" href="../../../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><a class="skip-main-content" href="#main-content">Skip to main content</a><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><h1><div class="sub-heading">common_function/scalars/json/</div>json_get_rewriter.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap digits-3"><pre class="rust"><code><a href=#1 id=1 data-nosnippet>1</a><span class="comment">// Copyright 2023 Greptime Team
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<a href=#2 id=2 data-nosnippet>2</a>//
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<a href=#3 id=3 data-nosnippet>3</a>// Licensed under the Apache License, Version 2.0 (the "License");
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<a href=#4 id=4 data-nosnippet>4</a>// you may not use this file except in compliance with the License.
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<a href=#5 id=5 data-nosnippet>5</a>// You may obtain a copy of the License at
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<a href=#6 id=6 data-nosnippet>6</a>//
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<a href=#7 id=7 data-nosnippet>7</a>// http://www.apache.org/licenses/LICENSE-2.0
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<a href=#8 id=8 data-nosnippet>8</a>//
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<a href=#9 id=9 data-nosnippet>9</a>// Unless required by applicable law or agreed to in writing, software
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<a href=#10 id=10 data-nosnippet>10</a>// distributed under the License is distributed on an "AS IS" BASIS,
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<a href=#11 id=11 data-nosnippet>11</a>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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<a href=#12 id=12 data-nosnippet>12</a>// See the License for the specific language governing permissions and
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<a href=#13 id=13 data-nosnippet>13</a>// limitations under the License.
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<a href=#14 id=14 data-nosnippet>14</a>
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<a href=#15 id=15 data-nosnippet>15</a></span><span class="attr">#[cfg(test)]
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<a href=#16 id=16 data-nosnippet>16</a></span><span class="kw">use </span>std::sync::Arc;
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<a href=#17 id=17 data-nosnippet>17</a>
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<a href=#18 id=18 data-nosnippet>18</a><span class="kw">use </span>arrow_schema::{DataType, TimeUnit};
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<a href=#19 id=19 data-nosnippet>19</a><span class="kw">use </span>datafusion::common::config::ConfigOptions;
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<a href=#20 id=20 data-nosnippet>20</a><span class="kw">use </span>datafusion::common::tree_node::Transformed;
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<a href=#21 id=21 data-nosnippet>21</a><span class="kw">use </span>datafusion::common::{DFSchema, <span class="prelude-ty">Result</span>};
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<a href=#22 id=22 data-nosnippet>22</a><span class="kw">use </span>datafusion::logical_expr::expr_rewriter::FunctionRewrite;
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<a href=#23 id=23 data-nosnippet>23</a><span class="kw">use </span>datafusion::scalar::ScalarValue;
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<a href=#24 id=24 data-nosnippet>24</a><span class="kw">use </span>datafusion_expr::expr::ScalarFunction;
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<a href=#25 id=25 data-nosnippet>25</a><span class="kw">use </span>datafusion_expr::{Cast, Expr};
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<a href=#26 id=26 data-nosnippet>26</a>
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<a href=#27 id=27 data-nosnippet>27</a><span class="kw">use </span><span class="kw">crate</span>::scalars::json::JsonGetWithType;
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<a href=#28 id=28 data-nosnippet>28</a>
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<a href=#29 id=29 data-nosnippet>29</a><span class="attr">#[derive(Debug)]
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<a href=#30 id=30 data-nosnippet>30</a></span><span class="kw">pub struct </span>JsonGetRewriter;
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<a href=#31 id=31 data-nosnippet>31</a>
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<a href=#32 id=32 data-nosnippet>32</a><span class="kw">impl </span>FunctionRewrite <span class="kw">for </span>JsonGetRewriter {
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<a href=#33 id=33 data-nosnippet>33</a> <span class="kw">fn </span>name(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span><span class="lifetime">'static </span>str {
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<a href=#34 id=34 data-nosnippet>34</a> <span class="string">"JsonGetRewriter"
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<a href=#35 id=35 data-nosnippet>35</a> </span>}
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<a href=#36 id=36 data-nosnippet>36</a>
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<a href=#37 id=37 data-nosnippet>37</a> <span class="kw">fn </span>rewrite(
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<a href=#38 id=38 data-nosnippet>38</a> <span class="kw-2">&</span><span class="self">self</span>,
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<a href=#39 id=39 data-nosnippet>39</a> expr: Expr,
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<a href=#40 id=40 data-nosnippet>40</a> _schema: <span class="kw-2">&</span>DFSchema,
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<a href=#41 id=41 data-nosnippet>41</a> _config: <span class="kw-2">&</span>ConfigOptions,
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<a href=#42 id=42 data-nosnippet>42</a> ) -> <span class="prelude-ty">Result</span><Transformed<Expr>> {
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<a href=#43 id=43 data-nosnippet>43</a> <span class="kw">let </span>transform = <span class="kw">match </span><span class="kw-2">&</span>expr {
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<a href=#44 id=44 data-nosnippet>44</a> Expr::Cast(cast) => rewrite_json_get_cast(cast),
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<a href=#45 id=45 data-nosnippet>45</a> Expr::ScalarFunction(scalar_func) => rewrite_arrow_cast_json_get(scalar_func),
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<a href=#46 id=46 data-nosnippet>46</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>,
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<a href=#47 id=47 data-nosnippet>47</a> };
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<a href=#48 id=48 data-nosnippet>48</a> <span class="prelude-val">Ok</span>(transform.unwrap_or_else(|| Transformed::no(expr)))
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<a href=#49 id=49 data-nosnippet>49</a> }
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<a href=#50 id=50 data-nosnippet>50</a>}
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<a href=#51 id=51 data-nosnippet>51</a>
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<a href=#52 id=52 data-nosnippet>52</a><span class="kw">fn </span>is_json_get_function_call(scalar_func: <span class="kw-2">&</span>ScalarFunction) -> bool {
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<a href=#53 id=53 data-nosnippet>53</a> scalar_func.func.name().to_ascii_lowercase() == JsonGetWithType::NAME
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<a href=#54 id=54 data-nosnippet>54</a> && scalar_func.args.len() == <span class="number">2
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<a href=#55 id=55 data-nosnippet>55</a></span>}
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<a href=#56 id=56 data-nosnippet>56</a>
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<a href=#57 id=57 data-nosnippet>57</a><span class="kw">fn </span>rewrite_json_get_cast(cast: <span class="kw-2">&</span>Cast) -> <span class="prelude-ty">Option</span><Transformed<Expr>> {
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<a href=#58 id=58 data-nosnippet>58</a> <span class="kw">let </span>scalar_func = extract_scalar_function(<span class="kw-2">&</span>cast.expr)<span class="question-mark">?</span>;
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<a href=#59 id=59 data-nosnippet>59</a> <span class="kw">if </span>is_json_get_function_call(scalar_func) {
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<a href=#60 id=60 data-nosnippet>60</a> <span class="kw">let </span>null_expr = Expr::Literal(ScalarValue::Null, <span class="prelude-val">None</span>);
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<a href=#61 id=61 data-nosnippet>61</a> <span class="kw">let </span>null_cast = Expr::Cast(datafusion::logical_expr::expr::Cast {
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<a href=#62 id=62 data-nosnippet>62</a> expr: Box::new(null_expr),
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<a href=#63 id=63 data-nosnippet>63</a> data_type: cast.data_type.clone(),
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<a href=#64 id=64 data-nosnippet>64</a> });
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<a href=#65 id=65 data-nosnippet>65</a>
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<a href=#66 id=66 data-nosnippet>66</a> <span class="kw">let </span><span class="kw-2">mut </span>args = scalar_func.args.clone();
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<a href=#67 id=67 data-nosnippet>67</a> args.push(null_cast);
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<a href=#68 id=68 data-nosnippet>68</a>
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<a href=#69 id=69 data-nosnippet>69</a> <span class="prelude-val">Some</span>(Transformed::yes(Expr::ScalarFunction(ScalarFunction {
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<a href=#70 id=70 data-nosnippet>70</a> func: scalar_func.func.clone(),
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<a href=#71 id=71 data-nosnippet>71</a> args,
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<a href=#72 id=72 data-nosnippet>72</a> })))
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<a href=#73 id=73 data-nosnippet>73</a> } <span class="kw">else </span>{
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<a href=#74 id=74 data-nosnippet>74</a> <span class="prelude-val">None
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<a href=#75 id=75 data-nosnippet>75</a> </span>}
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<a href=#76 id=76 data-nosnippet>76</a>}
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<a href=#77 id=77 data-nosnippet>77</a>
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<a href=#78 id=78 data-nosnippet>78</a><span class="comment">// Handle Arrow cast function: cast(json_get(a, 'path'), 'Int64')
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<a href=#79 id=79 data-nosnippet>79</a></span><span class="kw">fn </span>rewrite_arrow_cast_json_get(scalar_func: <span class="kw-2">&</span>ScalarFunction) -> <span class="prelude-ty">Option</span><Transformed<Expr>> {
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<a href=#80 id=80 data-nosnippet>80</a> <span class="comment">// Check if this is an Arrow cast function
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<a href=#81 id=81 data-nosnippet>81</a> // The function name might be "arrow_cast" or similar
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<a href=#82 id=82 data-nosnippet>82</a> </span><span class="kw">let </span>func_name = scalar_func.func.name().to_ascii_lowercase();
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<a href=#83 id=83 data-nosnippet>83</a> <span class="kw">if </span>!func_name.contains(<span class="string">"arrow_cast"</span>) {
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<a href=#84 id=84 data-nosnippet>84</a> <span class="kw">return </span><span class="prelude-val">None</span>;
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<a href=#85 id=85 data-nosnippet>85</a> }
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<a href=#86 id=86 data-nosnippet>86</a>
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<a href=#87 id=87 data-nosnippet>87</a> <span class="comment">// Arrow cast function should have exactly 2 arguments:
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<a href=#88 id=88 data-nosnippet>88</a> // 1. The expression to cast (could be json_get)
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<a href=#89 id=89 data-nosnippet>89</a> // 2. The target type as a string literal
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<a href=#90 id=90 data-nosnippet>90</a> </span><span class="kw">if </span>scalar_func.args.len() != <span class="number">2 </span>{
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<a href=#91 id=91 data-nosnippet>91</a> <span class="kw">return </span><span class="prelude-val">None</span>;
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<a href=#92 id=92 data-nosnippet>92</a> }
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<a href=#93 id=93 data-nosnippet>93</a>
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<a href=#94 id=94 data-nosnippet>94</a> <span class="comment">// Extract the inner json_get function
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<a href=#95 id=95 data-nosnippet>95</a> </span><span class="kw">let </span>json_get_func = extract_scalar_function(<span class="kw-2">&</span>scalar_func.args[<span class="number">0</span>])<span class="question-mark">?</span>;
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<a href=#96 id=96 data-nosnippet>96</a>
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<a href=#97 id=97 data-nosnippet>97</a> <span class="comment">// Check if it's a json_get function
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<a href=#98 id=98 data-nosnippet>98</a> </span><span class="kw">if </span>is_json_get_function_call(json_get_func) {
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<a href=#99 id=99 data-nosnippet>99</a> <span class="comment">// Get the target type from the second argument
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<a href=#100 id=100 data-nosnippet>100</a> </span><span class="kw">let </span>target_type = extract_string_literal(<span class="kw-2">&</span>scalar_func.args[<span class="number">1</span>])<span class="question-mark">?</span>;
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<a href=#101 id=101 data-nosnippet>101</a> <span class="kw">let </span>data_type = parse_data_type_from_string(<span class="kw-2">&</span>target_type)<span class="question-mark">?</span>;
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<a href=#102 id=102 data-nosnippet>102</a>
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<a href=#103 id=103 data-nosnippet>103</a> <span class="comment">// Create the null expression with the same type
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<a href=#104 id=104 data-nosnippet>104</a> </span><span class="kw">let </span>null_expr = Expr::Literal(ScalarValue::Null, <span class="prelude-val">None</span>);
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<a href=#105 id=105 data-nosnippet>105</a> <span class="kw">let </span>null_cast = Expr::Cast(datafusion::logical_expr::expr::Cast {
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<a href=#106 id=106 data-nosnippet>106</a> expr: Box::new(null_expr),
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<a href=#107 id=107 data-nosnippet>107</a> data_type,
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<a href=#108 id=108 data-nosnippet>108</a> });
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<a href=#109 id=109 data-nosnippet>109</a>
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<a href=#110 id=110 data-nosnippet>110</a> <span class="comment">// Create the new json_get_with_type function with the null parameter
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<a href=#111 id=111 data-nosnippet>111</a> </span><span class="kw">let </span><span class="kw-2">mut </span>args = json_get_func.args.clone();
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<a href=#112 id=112 data-nosnippet>112</a> args.push(null_cast);
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<a href=#113 id=113 data-nosnippet>113</a>
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<a href=#114 id=114 data-nosnippet>114</a> <span class="prelude-val">Some</span>(Transformed::yes(Expr::ScalarFunction(ScalarFunction {
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<a href=#115 id=115 data-nosnippet>115</a> func: json_get_func.func.clone(),
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<a href=#116 id=116 data-nosnippet>116</a> args,
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<a href=#117 id=117 data-nosnippet>117</a> })))
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<a href=#118 id=118 data-nosnippet>118</a> } <span class="kw">else </span>{
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<a href=#119 id=119 data-nosnippet>119</a> <span class="prelude-val">None
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<a href=#120 id=120 data-nosnippet>120</a> </span>}
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<a href=#121 id=121 data-nosnippet>121</a>}
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<a href=#122 id=122 data-nosnippet>122</a>
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<a href=#123 id=123 data-nosnippet>123</a><span class="comment">// Extract string literal from an expression
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<a href=#124 id=124 data-nosnippet>124</a></span><span class="kw">fn </span>extract_string_literal(expr: <span class="kw-2">&</span>Expr) -> <span class="prelude-ty">Option</span><String> {
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<a href=#125 id=125 data-nosnippet>125</a> <span class="kw">match </span>expr {
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<a href=#126 id=126 data-nosnippet>126</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(s)), <span class="kw">_</span>) => <span class="prelude-val">Some</span>(s.clone()),
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<a href=#127 id=127 data-nosnippet>127</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>,
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<a href=#128 id=128 data-nosnippet>128</a> }
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<a href=#129 id=129 data-nosnippet>129</a>}
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<a href=#130 id=130 data-nosnippet>130</a>
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<a href=#131 id=131 data-nosnippet>131</a><span class="comment">// Parse a data type from a string representation
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<a href=#132 id=132 data-nosnippet>132</a></span><span class="kw">fn </span>parse_data_type_from_string(type_str: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><DataType> {
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<a href=#133 id=133 data-nosnippet>133</a> <span class="kw">match </span>type_str.to_lowercase().as_str() {
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<a href=#134 id=134 data-nosnippet>134</a> <span class="string">"int8" </span>| <span class="string">"tinyint" </span>=> <span class="prelude-val">Some</span>(DataType::Int8),
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<a href=#135 id=135 data-nosnippet>135</a> <span class="string">"int16" </span>| <span class="string">"smallint" </span>=> <span class="prelude-val">Some</span>(DataType::Int16),
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<a href=#136 id=136 data-nosnippet>136</a> <span class="string">"int32" </span>| <span class="string">"integer" </span>=> <span class="prelude-val">Some</span>(DataType::Int32),
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<a href=#137 id=137 data-nosnippet>137</a> <span class="string">"int64" </span>| <span class="string">"bigint" </span>=> <span class="prelude-val">Some</span>(DataType::Int64),
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<a href=#138 id=138 data-nosnippet>138</a> <span class="string">"uint8" </span>=> <span class="prelude-val">Some</span>(DataType::UInt8),
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<a href=#139 id=139 data-nosnippet>139</a> <span class="string">"uint16" </span>=> <span class="prelude-val">Some</span>(DataType::UInt16),
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<a href=#140 id=140 data-nosnippet>140</a> <span class="string">"uint32" </span>=> <span class="prelude-val">Some</span>(DataType::UInt32),
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<a href=#141 id=141 data-nosnippet>141</a> <span class="string">"uint64" </span>=> <span class="prelude-val">Some</span>(DataType::UInt64),
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<a href=#142 id=142 data-nosnippet>142</a> <span class="string">"float32" </span>| <span class="string">"real" </span>=> <span class="prelude-val">Some</span>(DataType::Float32),
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<a href=#143 id=143 data-nosnippet>143</a> <span class="string">"float64" </span>| <span class="string">"double" </span>=> <span class="prelude-val">Some</span>(DataType::Float64),
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<a href=#144 id=144 data-nosnippet>144</a> <span class="string">"boolean" </span>| <span class="string">"bool" </span>=> <span class="prelude-val">Some</span>(DataType::Boolean),
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<a href=#145 id=145 data-nosnippet>145</a> <span class="string">"string" </span>| <span class="string">"text" </span>| <span class="string">"varchar" </span>=> <span class="prelude-val">Some</span>(DataType::Utf8),
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<a href=#146 id=146 data-nosnippet>146</a> <span class="string">"timestamp" </span>=> <span class="prelude-val">Some</span>(DataType::Timestamp(TimeUnit::Microsecond, <span class="prelude-val">None</span>)),
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<a href=#147 id=147 data-nosnippet>147</a> <span class="string">"date" </span>=> <span class="prelude-val">Some</span>(DataType::Date32),
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<a href=#148 id=148 data-nosnippet>148</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>,
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<a href=#149 id=149 data-nosnippet>149</a> }
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<a href=#150 id=150 data-nosnippet>150</a>}
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<a href=#151 id=151 data-nosnippet>151</a>
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<a href=#152 id=152 data-nosnippet>152</a><span class="kw">fn </span>extract_scalar_function(expr: <span class="kw-2">&</span>Expr) -> <span class="prelude-ty">Option</span><<span class="kw-2">&</span>ScalarFunction> {
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<a href=#153 id=153 data-nosnippet>153</a> <span class="kw">match </span>expr {
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<a href=#154 id=154 data-nosnippet>154</a> Expr::ScalarFunction(func) => <span class="prelude-val">Some</span>(func),
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<a href=#155 id=155 data-nosnippet>155</a> <span class="kw">_ </span>=> <span class="prelude-val">None</span>,
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<a href=#156 id=156 data-nosnippet>156</a> }
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<a href=#157 id=157 data-nosnippet>157</a>}
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<a href=#158 id=158 data-nosnippet>158</a>
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<a href=#159 id=159 data-nosnippet>159</a><span class="attr">#[cfg(test)]
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<a href=#160 id=160 data-nosnippet>160</a></span><span class="kw">mod </span>tests {
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<a href=#161 id=161 data-nosnippet>161</a> <span class="kw">use </span>arrow_schema::DataType;
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<a href=#162 id=162 data-nosnippet>162</a> <span class="kw">use </span>datafusion::common::DFSchema;
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<a href=#163 id=163 data-nosnippet>163</a> <span class="kw">use </span>datafusion::common::config::ConfigOptions;
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<a href=#164 id=164 data-nosnippet>164</a> <span class="kw">use </span>datafusion::logical_expr::expr::Cast;
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<a href=#165 id=165 data-nosnippet>165</a> <span class="kw">use </span>datafusion::scalar::ScalarValue;
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<a href=#166 id=166 data-nosnippet>166</a> <span class="kw">use </span>datafusion_expr::Expr;
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<a href=#167 id=167 data-nosnippet>167</a> <span class="kw">use </span>datafusion_expr::expr::ScalarFunction;
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<a href=#168 id=168 data-nosnippet>168</a>
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<a href=#169 id=169 data-nosnippet>169</a> <span class="kw">use </span>super::<span class="kw-2">*</span>;
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<a href=#170 id=170 data-nosnippet>170</a>
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<a href=#171 id=171 data-nosnippet>171</a> <span class="attr">#[test]
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<a href=#172 id=172 data-nosnippet>172</a> </span><span class="kw">fn </span>test_rewrite_regular_cast() {
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<a href=#173 id=173 data-nosnippet>173</a> <span class="kw">let </span>rewriter = JsonGetRewriter;
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<a href=#174 id=174 data-nosnippet>174</a> <span class="kw">let </span>schema = DFSchema::empty();
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<a href=#175 id=175 data-nosnippet>175</a> <span class="kw">let </span>config = ConfigOptions::new();
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<a href=#176 id=176 data-nosnippet>176</a>
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<a href=#177 id=177 data-nosnippet>177</a> <span class="comment">// Create a json_get function
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<a href=#178 id=178 data-nosnippet>178</a> </span><span class="kw">let </span>json_expr = Expr::ScalarFunction(ScalarFunction {
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<a href=#179 id=179 data-nosnippet>179</a> func: Arc::new(<span class="kw">crate</span>::scalars::udf::create_udf(Arc::new(
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<a href=#180 id=180 data-nosnippet>180</a> <span class="kw">crate</span>::scalars::json::JsonGetWithType::default(),
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<a href=#181 id=181 data-nosnippet>181</a> ))),
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<a href=#182 id=182 data-nosnippet>182</a> args: <span class="macro">vec!</span>[
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<a href=#183 id=183 data-nosnippet>183</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(<span class="string">"{\"a\":1}"</span>.to_string())), <span class="prelude-val">None</span>),
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<a href=#184 id=184 data-nosnippet>184</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(<span class="string">"$.a"</span>.to_string())), <span class="prelude-val">None</span>),
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<a href=#185 id=185 data-nosnippet>185</a> ],
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<a href=#186 id=186 data-nosnippet>186</a> });
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<a href=#187 id=187 data-nosnippet>187</a>
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<a href=#188 id=188 data-nosnippet>188</a> <span class="comment">// Create a cast expression: json_get(...)::int8
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<a href=#189 id=189 data-nosnippet>189</a> </span><span class="kw">let </span>cast_expr = Expr::Cast(Cast {
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<a href=#190 id=190 data-nosnippet>190</a> expr: Box::new(json_expr),
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<a href=#191 id=191 data-nosnippet>191</a> data_type: DataType::Int8,
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<a href=#192 id=192 data-nosnippet>192</a> });
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<a href=#193 id=193 data-nosnippet>193</a>
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<a href=#194 id=194 data-nosnippet>194</a> <span class="comment">// Apply the rewriter
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<a href=#195 id=195 data-nosnippet>195</a> </span><span class="kw">let </span>result = rewriter.rewrite(cast_expr, <span class="kw-2">&</span>schema, <span class="kw-2">&</span>config).unwrap();
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<a href=#196 id=196 data-nosnippet>196</a>
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<a href=#197 id=197 data-nosnippet>197</a> <span class="comment">// Verify the result is transformed
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<a href=#198 id=198 data-nosnippet>198</a> </span><span class="macro">assert!</span>(result.transformed);
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<a href=#199 id=199 data-nosnippet>199</a>
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<a href=#200 id=200 data-nosnippet>200</a> <span class="comment">// Verify the result is a ScalarFunction
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<a href=#201 id=201 data-nosnippet>201</a> </span><span class="kw">match </span>result.data {
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<a href=#202 id=202 data-nosnippet>202</a> Expr::ScalarFunction(func) => {
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<a href=#203 id=203 data-nosnippet>203</a> <span class="comment">// Should have 3 arguments now (original 2 + null cast)
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<a href=#204 id=204 data-nosnippet>204</a> </span><span class="macro">assert_eq!</span>(func.args.len(), <span class="number">3</span>);
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<a href=#205 id=205 data-nosnippet>205</a>
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<a href=#206 id=206 data-nosnippet>206</a> <span class="comment">// First argument should be the original json
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<a href=#207 id=207 data-nosnippet>207</a> </span><span class="kw">match </span><span class="kw-2">&</span>func.args[<span class="number">0</span>] {
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<a href=#208 id=208 data-nosnippet>208</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(json)), <span class="kw">_</span>) => {
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<a href=#209 id=209 data-nosnippet>209</a> <span class="macro">assert_eq!</span>(json, <span class="string">"{\"a\":1}"</span>);
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<a href=#210 id=210 data-nosnippet>210</a> }
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<a href=#211 id=211 data-nosnippet>211</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"First argument should be a string literal"</span>),
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<a href=#212 id=212 data-nosnippet>212</a> }
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<a href=#213 id=213 data-nosnippet>213</a>
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<a href=#214 id=214 data-nosnippet>214</a> <span class="comment">// Second argument should be the path
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<a href=#215 id=215 data-nosnippet>215</a> </span><span class="kw">match </span><span class="kw-2">&</span>func.args[<span class="number">1</span>] {
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<a href=#216 id=216 data-nosnippet>216</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(path)), <span class="kw">_</span>) => {
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<a href=#217 id=217 data-nosnippet>217</a> <span class="macro">assert_eq!</span>(path, <span class="string">"$.a"</span>);
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<a href=#218 id=218 data-nosnippet>218</a> }
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<a href=#219 id=219 data-nosnippet>219</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Second argument should be a string literal"</span>),
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<a href=#220 id=220 data-nosnippet>220</a> }
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<a href=#221 id=221 data-nosnippet>221</a>
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<a href=#222 id=222 data-nosnippet>222</a> <span class="comment">// Third argument should be a null cast to Int8
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<a href=#223 id=223 data-nosnippet>223</a> </span><span class="kw">match </span><span class="kw-2">&</span>func.args[<span class="number">2</span>] {
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<a href=#224 id=224 data-nosnippet>224</a> Expr::Cast(Cast { expr, data_type }) => {
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|
<a href=#225 id=225 data-nosnippet>225</a> <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>data_type, DataType::Int8);
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<a href=#226 id=226 data-nosnippet>226</a> <span class="kw">match </span>expr.as_ref() {
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<a href=#227 id=227 data-nosnippet>227</a> Expr::Literal(ScalarValue::Null, <span class="kw">_</span>) => {}
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|
<a href=#228 id=228 data-nosnippet>228</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Third argument should be a null cast"</span>),
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<a href=#229 id=229 data-nosnippet>229</a> }
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<a href=#230 id=230 data-nosnippet>230</a> }
|
|
<a href=#231 id=231 data-nosnippet>231</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Third argument should be a cast expression"</span>),
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<a href=#232 id=232 data-nosnippet>232</a> }
|
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<a href=#233 id=233 data-nosnippet>233</a> }
|
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<a href=#234 id=234 data-nosnippet>234</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Result should be a ScalarFunction"</span>),
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<a href=#235 id=235 data-nosnippet>235</a> }
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<a href=#236 id=236 data-nosnippet>236</a> }
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<a href=#237 id=237 data-nosnippet>237</a>
|
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<a href=#238 id=238 data-nosnippet>238</a> <span class="attr">#[test]
|
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<a href=#239 id=239 data-nosnippet>239</a> </span><span class="kw">fn </span>test_rewrite_arrow_cast_function() {
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|
<a href=#240 id=240 data-nosnippet>240</a> <span class="kw">let </span>rewriter = JsonGetRewriter;
|
|
<a href=#241 id=241 data-nosnippet>241</a> <span class="kw">let </span>schema = DFSchema::empty();
|
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<a href=#242 id=242 data-nosnippet>242</a> <span class="kw">let </span>config = ConfigOptions::new();
|
|
<a href=#243 id=243 data-nosnippet>243</a>
|
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<a href=#244 id=244 data-nosnippet>244</a> <span class="comment">// Create a parse_json function
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|
<a href=#245 id=245 data-nosnippet>245</a> </span><span class="kw">let </span>parse_json_expr = Expr::ScalarFunction(ScalarFunction {
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<a href=#246 id=246 data-nosnippet>246</a> func: Arc::new(<span class="kw">crate</span>::scalars::udf::create_udf(Arc::new(
|
|
<a href=#247 id=247 data-nosnippet>247</a> <span class="kw">crate</span>::scalars::json::ParseJsonFunction::default(),
|
|
<a href=#248 id=248 data-nosnippet>248</a> ))),
|
|
<a href=#249 id=249 data-nosnippet>249</a> args: <span class="macro">vec!</span>[Expr::Literal(
|
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<a href=#250 id=250 data-nosnippet>250</a> ScalarValue::Utf8(<span class="prelude-val">Some</span>(<span class="string">"{\"a\":1}"</span>.to_string())),
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<a href=#251 id=251 data-nosnippet>251</a> <span class="prelude-val">None</span>,
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|
<a href=#252 id=252 data-nosnippet>252</a> )],
|
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<a href=#253 id=253 data-nosnippet>253</a> });
|
|
<a href=#254 id=254 data-nosnippet>254</a>
|
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<a href=#255 id=255 data-nosnippet>255</a> <span class="comment">// Create a json_get function
|
|
<a href=#256 id=256 data-nosnippet>256</a> </span><span class="kw">let </span>json_get_expr = Expr::ScalarFunction(ScalarFunction {
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<a href=#257 id=257 data-nosnippet>257</a> func: Arc::new(<span class="kw">crate</span>::scalars::udf::create_udf(Arc::new(
|
|
<a href=#258 id=258 data-nosnippet>258</a> <span class="kw">crate</span>::scalars::json::JsonGetWithType::default(),
|
|
<a href=#259 id=259 data-nosnippet>259</a> ))),
|
|
<a href=#260 id=260 data-nosnippet>260</a> args: <span class="macro">vec!</span>[
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|
<a href=#261 id=261 data-nosnippet>261</a> parse_json_expr,
|
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<a href=#262 id=262 data-nosnippet>262</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(<span class="string">"a"</span>.to_string())), <span class="prelude-val">None</span>),
|
|
<a href=#263 id=263 data-nosnippet>263</a> ],
|
|
<a href=#264 id=264 data-nosnippet>264</a> });
|
|
<a href=#265 id=265 data-nosnippet>265</a>
|
|
<a href=#266 id=266 data-nosnippet>266</a> <span class="comment">// Create an arrow cast function: cast(json_get(...), 'Int64')
|
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<a href=#267 id=267 data-nosnippet>267</a> // Note: ArrowCastFunc doesn't exist in this codebase, so this test uses a simple cast instead
|
|
<a href=#268 id=268 data-nosnippet>268</a> </span><span class="kw">let </span>arrow_cast_expr = Expr::Cast(Cast {
|
|
<a href=#269 id=269 data-nosnippet>269</a> expr: Box::new(json_get_expr),
|
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<a href=#270 id=270 data-nosnippet>270</a> data_type: DataType::Int64,
|
|
<a href=#271 id=271 data-nosnippet>271</a> });
|
|
<a href=#272 id=272 data-nosnippet>272</a>
|
|
<a href=#273 id=273 data-nosnippet>273</a> <span class="comment">// Apply the rewriter
|
|
<a href=#274 id=274 data-nosnippet>274</a> </span><span class="kw">let </span>result = rewriter.rewrite(arrow_cast_expr, <span class="kw-2">&</span>schema, <span class="kw-2">&</span>config).unwrap();
|
|
<a href=#275 id=275 data-nosnippet>275</a>
|
|
<a href=#276 id=276 data-nosnippet>276</a> <span class="comment">// Verify the result is transformed
|
|
<a href=#277 id=277 data-nosnippet>277</a> </span><span class="macro">assert!</span>(result.transformed);
|
|
<a href=#278 id=278 data-nosnippet>278</a>
|
|
<a href=#279 id=279 data-nosnippet>279</a> <span class="comment">// Verify the result is a ScalarFunction (json_get_with_type)
|
|
<a href=#280 id=280 data-nosnippet>280</a> </span><span class="kw">match </span>result.data {
|
|
<a href=#281 id=281 data-nosnippet>281</a> Expr::ScalarFunction(func) => {
|
|
<a href=#282 id=282 data-nosnippet>282</a> <span class="comment">// Should have 3 arguments now (original 2 + null cast)
|
|
<a href=#283 id=283 data-nosnippet>283</a> </span><span class="macro">assert_eq!</span>(func.args.len(), <span class="number">3</span>);
|
|
<a href=#284 id=284 data-nosnippet>284</a>
|
|
<a href=#285 id=285 data-nosnippet>285</a> <span class="comment">// First argument should be the original parse_json function
|
|
<a href=#286 id=286 data-nosnippet>286</a> </span><span class="kw">match </span><span class="kw-2">&</span>func.args[<span class="number">0</span>] {
|
|
<a href=#287 id=287 data-nosnippet>287</a> Expr::ScalarFunction(parse_func) => {
|
|
<a href=#288 id=288 data-nosnippet>288</a> <span class="comment">// Verify it's a parse_json function with the right argument
|
|
<a href=#289 id=289 data-nosnippet>289</a> </span><span class="macro">assert!</span>(
|
|
<a href=#290 id=290 data-nosnippet>290</a> parse_func
|
|
<a href=#291 id=291 data-nosnippet>291</a> .func
|
|
<a href=#292 id=292 data-nosnippet>292</a> .name()
|
|
<a href=#293 id=293 data-nosnippet>293</a> .to_ascii_lowercase()
|
|
<a href=#294 id=294 data-nosnippet>294</a> .contains(<span class="string">"parse_json"</span>)
|
|
<a href=#295 id=295 data-nosnippet>295</a> );
|
|
<a href=#296 id=296 data-nosnippet>296</a> <span class="macro">assert_eq!</span>(parse_func.args.len(), <span class="number">1</span>);
|
|
<a href=#297 id=297 data-nosnippet>297</a> <span class="kw">match </span><span class="kw-2">&</span>parse_func.args[<span class="number">0</span>] {
|
|
<a href=#298 id=298 data-nosnippet>298</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(json)), <span class="kw">_</span>) => {
|
|
<a href=#299 id=299 data-nosnippet>299</a> <span class="macro">assert_eq!</span>(json, <span class="string">"{\"a\":1}"</span>);
|
|
<a href=#300 id=300 data-nosnippet>300</a> }
|
|
<a href=#301 id=301 data-nosnippet>301</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Parse json argument should be a string literal"</span>),
|
|
<a href=#302 id=302 data-nosnippet>302</a> }
|
|
<a href=#303 id=303 data-nosnippet>303</a> }
|
|
<a href=#304 id=304 data-nosnippet>304</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"First argument should be a parse_json function"</span>),
|
|
<a href=#305 id=305 data-nosnippet>305</a> }
|
|
<a href=#306 id=306 data-nosnippet>306</a>
|
|
<a href=#307 id=307 data-nosnippet>307</a> <span class="comment">// Second argument should be the path
|
|
<a href=#308 id=308 data-nosnippet>308</a> </span><span class="kw">match </span><span class="kw-2">&</span>func.args[<span class="number">1</span>] {
|
|
<a href=#309 id=309 data-nosnippet>309</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(path)), <span class="kw">_</span>) => {
|
|
<a href=#310 id=310 data-nosnippet>310</a> <span class="macro">assert_eq!</span>(path, <span class="string">"a"</span>);
|
|
<a href=#311 id=311 data-nosnippet>311</a> }
|
|
<a href=#312 id=312 data-nosnippet>312</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Second argument should be a string literal"</span>),
|
|
<a href=#313 id=313 data-nosnippet>313</a> }
|
|
<a href=#314 id=314 data-nosnippet>314</a>
|
|
<a href=#315 id=315 data-nosnippet>315</a> <span class="comment">// Third argument should be a null cast to Int64
|
|
<a href=#316 id=316 data-nosnippet>316</a> </span><span class="kw">match </span><span class="kw-2">&</span>func.args[<span class="number">2</span>] {
|
|
<a href=#317 id=317 data-nosnippet>317</a> Expr::Cast(Cast { expr, data_type }) => {
|
|
<a href=#318 id=318 data-nosnippet>318</a> <span class="macro">assert_eq!</span>(<span class="kw-2">*</span>data_type, DataType::Int64);
|
|
<a href=#319 id=319 data-nosnippet>319</a> <span class="kw">match </span>expr.as_ref() {
|
|
<a href=#320 id=320 data-nosnippet>320</a> Expr::Literal(ScalarValue::Null, <span class="kw">_</span>) => {}
|
|
<a href=#321 id=321 data-nosnippet>321</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Third argument should be a null cast"</span>),
|
|
<a href=#322 id=322 data-nosnippet>322</a> }
|
|
<a href=#323 id=323 data-nosnippet>323</a> }
|
|
<a href=#324 id=324 data-nosnippet>324</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Third argument should be a cast expression"</span>),
|
|
<a href=#325 id=325 data-nosnippet>325</a> }
|
|
<a href=#326 id=326 data-nosnippet>326</a> }
|
|
<a href=#327 id=327 data-nosnippet>327</a> <span class="kw">_ </span>=> <span class="macro">panic!</span>(<span class="string">"Result should be a ScalarFunction"</span>),
|
|
<a href=#328 id=328 data-nosnippet>328</a> }
|
|
<a href=#329 id=329 data-nosnippet>329</a> }
|
|
<a href=#330 id=330 data-nosnippet>330</a>
|
|
<a href=#331 id=331 data-nosnippet>331</a> <span class="attr">#[test]
|
|
<a href=#332 id=332 data-nosnippet>332</a> </span><span class="kw">fn </span>test_no_rewrite_for_other_functions() {
|
|
<a href=#333 id=333 data-nosnippet>333</a> <span class="kw">let </span>rewriter = JsonGetRewriter;
|
|
<a href=#334 id=334 data-nosnippet>334</a> <span class="kw">let </span>schema = DFSchema::empty();
|
|
<a href=#335 id=335 data-nosnippet>335</a> <span class="kw">let </span>config = ConfigOptions::new();
|
|
<a href=#336 id=336 data-nosnippet>336</a>
|
|
<a href=#337 id=337 data-nosnippet>337</a> <span class="comment">// Create a non-json function
|
|
<a href=#338 id=338 data-nosnippet>338</a> </span><span class="kw">let </span>other_func = Expr::ScalarFunction(ScalarFunction {
|
|
<a href=#339 id=339 data-nosnippet>339</a> func: Arc::new(<span class="kw">crate</span>::scalars::udf::create_udf(Arc::new(
|
|
<a href=#340 id=340 data-nosnippet>340</a> <span class="kw">crate</span>::scalars::test::TestAndFunction::default(),
|
|
<a href=#341 id=341 data-nosnippet>341</a> ))),
|
|
<a href=#342 id=342 data-nosnippet>342</a> args: <span class="macro">vec!</span>[Expr::Literal(ScalarValue::Int64(<span class="prelude-val">Some</span>(<span class="number">4</span>)), <span class="prelude-val">None</span>)],
|
|
<a href=#343 id=343 data-nosnippet>343</a> });
|
|
<a href=#344 id=344 data-nosnippet>344</a>
|
|
<a href=#345 id=345 data-nosnippet>345</a> <span class="comment">// Apply the rewriter
|
|
<a href=#346 id=346 data-nosnippet>346</a> </span><span class="kw">let </span>result = rewriter.rewrite(other_func, <span class="kw-2">&</span>schema, <span class="kw-2">&</span>config).unwrap();
|
|
<a href=#347 id=347 data-nosnippet>347</a>
|
|
<a href=#348 id=348 data-nosnippet>348</a> <span class="comment">// Verify the result is not transformed
|
|
<a href=#349 id=349 data-nosnippet>349</a> </span><span class="macro">assert!</span>(!result.transformed);
|
|
<a href=#350 id=350 data-nosnippet>350</a> }
|
|
<a href=#351 id=351 data-nosnippet>351</a>
|
|
<a href=#352 id=352 data-nosnippet>352</a> <span class="attr">#[test]
|
|
<a href=#353 id=353 data-nosnippet>353</a> </span><span class="kw">fn </span>test_no_rewrite_for_non_cast_functions() {
|
|
<a href=#354 id=354 data-nosnippet>354</a> <span class="kw">let </span>rewriter = JsonGetRewriter;
|
|
<a href=#355 id=355 data-nosnippet>355</a> <span class="kw">let </span>schema = DFSchema::empty();
|
|
<a href=#356 id=356 data-nosnippet>356</a> <span class="kw">let </span>config = ConfigOptions::new();
|
|
<a href=#357 id=357 data-nosnippet>357</a>
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<a href=#358 id=358 data-nosnippet>358</a> <span class="comment">// Create a scalar function that doesn't contain "cast"
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<a href=#359 id=359 data-nosnippet>359</a> </span><span class="kw">let </span>other_func = Expr::ScalarFunction(ScalarFunction {
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<a href=#360 id=360 data-nosnippet>360</a> func: Arc::new(<span class="kw">crate</span>::scalars::udf::create_udf(Arc::new(
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<a href=#361 id=361 data-nosnippet>361</a> <span class="kw">crate</span>::scalars::test::TestAndFunction::default(),
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<a href=#362 id=362 data-nosnippet>362</a> ))),
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<a href=#363 id=363 data-nosnippet>363</a> args: <span class="macro">vec!</span>[
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<a href=#364 id=364 data-nosnippet>364</a> Expr::ScalarFunction(ScalarFunction {
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<a href=#365 id=365 data-nosnippet>365</a> func: Arc::new(<span class="kw">crate</span>::scalars::udf::create_udf(Arc::new(
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<a href=#366 id=366 data-nosnippet>366</a> <span class="kw">crate</span>::scalars::json::JsonGetWithType::default(),
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<a href=#367 id=367 data-nosnippet>367</a> ))),
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<a href=#368 id=368 data-nosnippet>368</a> args: <span class="macro">vec!</span>[
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<a href=#369 id=369 data-nosnippet>369</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(<span class="string">"{\"a\":1}"</span>.to_string())), <span class="prelude-val">None</span>),
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<a href=#370 id=370 data-nosnippet>370</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(<span class="string">"$.a"</span>.to_string())), <span class="prelude-val">None</span>),
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<a href=#371 id=371 data-nosnippet>371</a> ],
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<a href=#372 id=372 data-nosnippet>372</a> }),
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<a href=#373 id=373 data-nosnippet>373</a> Expr::Literal(ScalarValue::Utf8(<span class="prelude-val">Some</span>(<span class="string">"Int64"</span>.to_string())), <span class="prelude-val">None</span>),
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<a href=#374 id=374 data-nosnippet>374</a> ],
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<a href=#375 id=375 data-nosnippet>375</a> });
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<a href=#376 id=376 data-nosnippet>376</a>
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<a href=#377 id=377 data-nosnippet>377</a> <span class="comment">// Apply the rewriter
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<a href=#378 id=378 data-nosnippet>378</a> </span><span class="kw">let </span>result = rewriter.rewrite(other_func, <span class="kw-2">&</span>schema, <span class="kw-2">&</span>config).unwrap();
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<a href=#379 id=379 data-nosnippet>379</a>
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<a href=#380 id=380 data-nosnippet>380</a> <span class="comment">// Verify the result is not transformed
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<a href=#381 id=381 data-nosnippet>381</a> </span><span class="macro">assert!</span>(!result.transformed);
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<a href=#382 id=382 data-nosnippet>382</a> }
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<a href=#383 id=383 data-nosnippet>383</a>}
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</code></pre></div></section></main></body></html> |