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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/flow/src/adapter/util.rs`."><title>util.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="flow" data-themes="" data-resource-suffix="" data-rustdoc-version="1.96.1 (31fca3adb 2026-06-26)" data-channel="1.96.1" data-search-js="search-b5634cc7.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">flow/adapter/</div>util.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
<a href=#2 id=2 data-nosnippet>2</a>//
<a href=#3 id=3 data-nosnippet>3</a>// Licensed under the Apache License, Version 2.0 (the "License");
<a href=#4 id=4 data-nosnippet>4</a>// you may not use this file except in compliance with the License.
<a href=#5 id=5 data-nosnippet>5</a>// You may obtain a copy of the License at
<a href=#6 id=6 data-nosnippet>6</a>//
<a href=#7 id=7 data-nosnippet>7</a>// http://www.apache.org/licenses/LICENSE-2.0
<a href=#8 id=8 data-nosnippet>8</a>//
<a href=#9 id=9 data-nosnippet>9</a>// Unless required by applicable law or agreed to in writing, software
<a href=#10 id=10 data-nosnippet>10</a>// distributed under the License is distributed on an "AS IS" BASIS,
<a href=#11 id=11 data-nosnippet>11</a>// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<a href=#12 id=12 data-nosnippet>12</a>// See the License for the specific language governing permissions and
<a href=#13 id=13 data-nosnippet>13</a>// limitations under the License.
<a href=#14 id=14 data-nosnippet>14</a>
<a href=#15 id=15 data-nosnippet>15</a></span><span class="doccomment">//! Util functions for adapter
<a href=#16 id=16 data-nosnippet>16</a>
<a href=#17 id=17 data-nosnippet>17</a></span><span class="kw">use </span>api::helper::ColumnDataTypeWrapper;
<a href=#18 id=18 data-nosnippet>18</a><span class="kw">use </span>api::v1::column_def::options_from_column_schema;
<a href=#19 id=19 data-nosnippet>19</a><span class="kw">use </span>api::v1::{ColumnDataType, ColumnDataTypeExtension, SemanticType};
<a href=#20 id=20 data-nosnippet>20</a><span class="kw">use </span>common_error::ext::BoxedError;
<a href=#21 id=21 data-nosnippet>21</a><span class="kw">use </span>common_meta::key::table_info::TableInfoValue;
<a href=#22 id=22 data-nosnippet>22</a><span class="kw">use </span>datatypes::prelude::ConcreteDataType;
<a href=#23 id=23 data-nosnippet>23</a><span class="kw">use </span>datatypes::schema::{ColumnDefaultConstraint, ColumnSchema};
<a href=#24 id=24 data-nosnippet>24</a><span class="kw">use </span>itertools::Itertools;
<a href=#25 id=25 data-nosnippet>25</a><span class="kw">use </span>operator::expr_helper;
<a href=#26 id=26 data-nosnippet>26</a><span class="kw">use </span>snafu::ResultExt;
<a href=#27 id=27 data-nosnippet>27</a><span class="kw">use </span>table::table_reference::TableReference;
<a href=#28 id=28 data-nosnippet>28</a>
<a href=#29 id=29 data-nosnippet>29</a><span class="kw">use </span><span class="kw">crate</span>::StreamingEngine;
<a href=#30 id=30 data-nosnippet>30</a><span class="kw">use </span><span class="kw">crate</span>::adapter::table_source::TableDesc;
<a href=#31 id=31 data-nosnippet>31</a><span class="kw">use </span><span class="kw">crate</span>::adapter::{AUTO_CREATED_PLACEHOLDER_TS_COL, TableName};
<a href=#32 id=32 data-nosnippet>32</a><span class="kw">use </span><span class="kw">crate</span>::error::{Error, ExternalSnafu};
<a href=#33 id=33 data-nosnippet>33</a><span class="kw">use </span><span class="kw">crate</span>::repr::{ColumnType, RelationDesc, RelationType};
<a href=#34 id=34 data-nosnippet>34</a><span class="kw">impl </span>StreamingEngine {
<a href=#35 id=35 data-nosnippet>35</a> <span class="doccomment">/// Create table from given schema(will adjust to add auto column if needed), return true if table is created
<a href=#36 id=36 data-nosnippet>36</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">async fn </span>create_table_from_relation(
<a href=#37 id=37 data-nosnippet>37</a> <span class="kw-2">&amp;</span><span class="self">self</span>,
<a href=#38 id=38 data-nosnippet>38</a> flow_name: <span class="kw-2">&amp;</span>str,
<a href=#39 id=39 data-nosnippet>39</a> table_name: <span class="kw-2">&amp;</span>TableName,
<a href=#40 id=40 data-nosnippet>40</a> relation_desc: <span class="kw-2">&amp;</span>RelationDesc,
<a href=#41 id=41 data-nosnippet>41</a> ) -&gt; <span class="prelude-ty">Result</span>&lt;bool, Error&gt; {
<a href=#42 id=42 data-nosnippet>42</a> <span class="kw">if </span><span class="self">self</span>.fetch_table_pk_schema(table_name).<span class="kw">await</span><span class="question-mark">?</span>.is_some() {
<a href=#43 id=43 data-nosnippet>43</a> <span class="kw">return </span><span class="prelude-val">Ok</span>(<span class="bool-val">false</span>);
<a href=#44 id=44 data-nosnippet>44</a> }
<a href=#45 id=45 data-nosnippet>45</a> <span class="kw">let </span>(pks, tys, <span class="kw">_</span>) = <span class="self">self</span>.adjust_auto_created_table_schema(relation_desc).<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#46 id=46 data-nosnippet>46</a>
<a href=#47 id=47 data-nosnippet>47</a> <span class="comment">//create sink table using pks, column types and is_ts_auto
<a href=#48 id=48 data-nosnippet>48</a>
<a href=#49 id=49 data-nosnippet>49</a> </span><span class="kw">let </span>proto_schema = column_schemas_to_proto(tys.clone(), <span class="kw-2">&amp;</span>pks)<span class="question-mark">?</span>;
<a href=#50 id=50 data-nosnippet>50</a>
<a href=#51 id=51 data-nosnippet>51</a> <span class="comment">// create sink table
<a href=#52 id=52 data-nosnippet>52</a> </span><span class="kw">let </span>create_expr = expr_helper::create_table_expr_by_column_schemas(
<a href=#53 id=53 data-nosnippet>53</a> <span class="kw-2">&amp;</span>TableReference {
<a href=#54 id=54 data-nosnippet>54</a> catalog: <span class="kw-2">&amp;</span>table_name[<span class="number">0</span>],
<a href=#55 id=55 data-nosnippet>55</a> schema: <span class="kw-2">&amp;</span>table_name[<span class="number">1</span>],
<a href=#56 id=56 data-nosnippet>56</a> table: <span class="kw-2">&amp;</span>table_name[<span class="number">2</span>],
<a href=#57 id=57 data-nosnippet>57</a> },
<a href=#58 id=58 data-nosnippet>58</a> <span class="kw-2">&amp;</span>proto_schema,
<a href=#59 id=59 data-nosnippet>59</a> <span class="string">"mito"</span>,
<a href=#60 id=60 data-nosnippet>60</a> <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="macro">format!</span>(<span class="string">"Sink table for flow {}"</span>, flow_name)),
<a href=#61 id=61 data-nosnippet>61</a> )
<a href=#62 id=62 data-nosnippet>62</a> .map_err(BoxedError::new)
<a href=#63 id=63 data-nosnippet>63</a> .context(ExternalSnafu)<span class="question-mark">?</span>;
<a href=#64 id=64 data-nosnippet>64</a>
<a href=#65 id=65 data-nosnippet>65</a> <span class="self">self</span>.frontend_client
<a href=#66 id=66 data-nosnippet>66</a> .create(create_expr, <span class="kw-2">&amp;</span>table_name[<span class="number">0</span>], <span class="kw-2">&amp;</span>table_name[<span class="number">1</span>])
<a href=#67 id=67 data-nosnippet>67</a> .<span class="kw">await</span><span class="question-mark">?</span>;
<a href=#68 id=68 data-nosnippet>68</a> <span class="prelude-val">Ok</span>(<span class="bool-val">true</span>)
<a href=#69 id=69 data-nosnippet>69</a> }
<a href=#70 id=70 data-nosnippet>70</a>
<a href=#71 id=71 data-nosnippet>71</a> <span class="doccomment">/// Try fetch table with adjusted schema(added auto column if needed)
<a href=#72 id=72 data-nosnippet>72</a> </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">async fn </span>try_fetch_existing_table(
<a href=#73 id=73 data-nosnippet>73</a> <span class="kw-2">&amp;</span><span class="self">self</span>,
<a href=#74 id=74 data-nosnippet>74</a> table_name: <span class="kw-2">&amp;</span>TableName,
<a href=#75 id=75 data-nosnippet>75</a> ) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="prelude-ty">Option</span>&lt;(bool, Vec&lt;api::v1::ColumnSchema&gt;)&gt;, Error&gt; {
<a href=#76 id=76 data-nosnippet>76</a> <span class="kw">if let </span><span class="prelude-val">Some</span>((primary_keys, time_index, schema)) =
<a href=#77 id=77 data-nosnippet>77</a> <span class="self">self</span>.fetch_table_pk_schema(table_name).<span class="kw">await</span><span class="question-mark">?
<a href=#78 id=78 data-nosnippet>78</a> </span>{
<a href=#79 id=79 data-nosnippet>79</a> <span class="comment">// check if the last column is the auto created timestamp column, hence the table is auto created from
<a href=#80 id=80 data-nosnippet>80</a> // flow's plan type
<a href=#81 id=81 data-nosnippet>81</a> </span><span class="kw">let </span>is_auto_create = {
<a href=#82 id=82 data-nosnippet>82</a> <span class="kw">let </span>correct_name = schema
<a href=#83 id=83 data-nosnippet>83</a> .last()
<a href=#84 id=84 data-nosnippet>84</a> .map(|s| s.name == AUTO_CREATED_PLACEHOLDER_TS_COL)
<a href=#85 id=85 data-nosnippet>85</a> .unwrap_or(<span class="bool-val">false</span>);
<a href=#86 id=86 data-nosnippet>86</a> <span class="kw">let </span>correct_time_index = time_index == <span class="prelude-val">Some</span>(schema.len() - <span class="number">1</span>);
<a href=#87 id=87 data-nosnippet>87</a> correct_name &amp;&amp; correct_time_index
<a href=#88 id=88 data-nosnippet>88</a> };
<a href=#89 id=89 data-nosnippet>89</a> <span class="kw">let </span>proto_schema = column_schemas_to_proto(schema, <span class="kw-2">&amp;</span>primary_keys)<span class="question-mark">?</span>;
<a href=#90 id=90 data-nosnippet>90</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">Some</span>((is_auto_create, proto_schema)))
<a href=#91 id=91 data-nosnippet>91</a> } <span class="kw">else </span>{
<a href=#92 id=92 data-nosnippet>92</a> <span class="prelude-val">Ok</span>(<span class="prelude-val">None</span>)
<a href=#93 id=93 data-nosnippet>93</a> }
<a href=#94 id=94 data-nosnippet>94</a> }
<a href=#95 id=95 data-nosnippet>95</a>}
<a href=#96 id=96 data-nosnippet>96</a>
<a href=#97 id=97 data-nosnippet>97</a><span class="kw">pub fn </span>table_info_value_to_relation_desc(
<a href=#98 id=98 data-nosnippet>98</a> table_info_value: TableInfoValue,
<a href=#99 id=99 data-nosnippet>99</a>) -&gt; <span class="prelude-ty">Result</span>&lt;TableDesc, Error&gt; {
<a href=#100 id=100 data-nosnippet>100</a> <span class="kw">let </span>raw_schema = table_info_value.table_info.meta.schema;
<a href=#101 id=101 data-nosnippet>101</a> <span class="kw">let </span>(column_types, col_names): (Vec&lt;<span class="kw">_</span>&gt;, Vec&lt;<span class="kw">_</span>&gt;) = raw_schema
<a href=#102 id=102 data-nosnippet>102</a> .column_schemas()
<a href=#103 id=103 data-nosnippet>103</a> .to_vec()
<a href=#104 id=104 data-nosnippet>104</a> .into_iter()
<a href=#105 id=105 data-nosnippet>105</a> .map(|col| {
<a href=#106 id=106 data-nosnippet>106</a> (
<a href=#107 id=107 data-nosnippet>107</a> ColumnType {
<a href=#108 id=108 data-nosnippet>108</a> nullable: col.is_nullable(),
<a href=#109 id=109 data-nosnippet>109</a> scalar_type: col.data_type,
<a href=#110 id=110 data-nosnippet>110</a> },
<a href=#111 id=111 data-nosnippet>111</a> <span class="prelude-val">Some</span>(col.name),
<a href=#112 id=112 data-nosnippet>112</a> )
<a href=#113 id=113 data-nosnippet>113</a> })
<a href=#114 id=114 data-nosnippet>114</a> .unzip();
<a href=#115 id=115 data-nosnippet>115</a>
<a href=#116 id=116 data-nosnippet>116</a> <span class="kw">let </span>key = table_info_value.table_info.meta.primary_key_indices;
<a href=#117 id=117 data-nosnippet>117</a> <span class="kw">let </span>keys = <span class="macro">vec!</span>[<span class="kw">crate</span>::repr::Key::from(key)];
<a href=#118 id=118 data-nosnippet>118</a>
<a href=#119 id=119 data-nosnippet>119</a> <span class="kw">let </span>time_index = raw_schema.timestamp_index();
<a href=#120 id=120 data-nosnippet>120</a> <span class="kw">let </span>relation_desc = RelationDesc {
<a href=#121 id=121 data-nosnippet>121</a> typ: RelationType {
<a href=#122 id=122 data-nosnippet>122</a> column_types,
<a href=#123 id=123 data-nosnippet>123</a> keys,
<a href=#124 id=124 data-nosnippet>124</a> time_index,
<a href=#125 id=125 data-nosnippet>125</a> <span class="comment">// by default table schema's column are all non-auto
<a href=#126 id=126 data-nosnippet>126</a> </span>auto_columns: <span class="macro">vec!</span>[],
<a href=#127 id=127 data-nosnippet>127</a> },
<a href=#128 id=128 data-nosnippet>128</a> names: col_names,
<a href=#129 id=129 data-nosnippet>129</a> };
<a href=#130 id=130 data-nosnippet>130</a> <span class="kw">let </span>default_values = raw_schema
<a href=#131 id=131 data-nosnippet>131</a> .column_schemas()
<a href=#132 id=132 data-nosnippet>132</a> .iter()
<a href=#133 id=133 data-nosnippet>133</a> .map(|c| {
<a href=#134 id=134 data-nosnippet>134</a> c.default_constraint().cloned().or_else(|| {
<a href=#135 id=135 data-nosnippet>135</a> <span class="kw">if </span>c.is_nullable() {
<a href=#136 id=136 data-nosnippet>136</a> <span class="prelude-val">Some</span>(ColumnDefaultConstraint::null_value())
<a href=#137 id=137 data-nosnippet>137</a> } <span class="kw">else </span>{
<a href=#138 id=138 data-nosnippet>138</a> <span class="prelude-val">None
<a href=#139 id=139 data-nosnippet>139</a> </span>}
<a href=#140 id=140 data-nosnippet>140</a> })
<a href=#141 id=141 data-nosnippet>141</a> })
<a href=#142 id=142 data-nosnippet>142</a> .collect_vec();
<a href=#143 id=143 data-nosnippet>143</a>
<a href=#144 id=144 data-nosnippet>144</a> <span class="prelude-val">Ok</span>(TableDesc::new(relation_desc, default_values))
<a href=#145 id=145 data-nosnippet>145</a>}
<a href=#146 id=146 data-nosnippet>146</a>
<a href=#147 id=147 data-nosnippet>147</a><span class="kw">pub fn </span>from_proto_to_data_type(
<a href=#148 id=148 data-nosnippet>148</a> column_schema: <span class="kw-2">&amp;</span>api::v1::ColumnSchema,
<a href=#149 id=149 data-nosnippet>149</a>) -&gt; <span class="prelude-ty">Result</span>&lt;ConcreteDataType, Error&gt; {
<a href=#150 id=150 data-nosnippet>150</a> <span class="kw">let </span>wrapper = ColumnDataTypeWrapper::try_new(
<a href=#151 id=151 data-nosnippet>151</a> column_schema.datatype,
<a href=#152 id=152 data-nosnippet>152</a> column_schema.datatype_extension.clone(),
<a href=#153 id=153 data-nosnippet>153</a> )
<a href=#154 id=154 data-nosnippet>154</a> .map_err(BoxedError::new)
<a href=#155 id=155 data-nosnippet>155</a> .context(ExternalSnafu)<span class="question-mark">?</span>;
<a href=#156 id=156 data-nosnippet>156</a> <span class="kw">let </span>cdt = ConcreteDataType::from(wrapper);
<a href=#157 id=157 data-nosnippet>157</a>
<a href=#158 id=158 data-nosnippet>158</a> <span class="prelude-val">Ok</span>(cdt)
<a href=#159 id=159 data-nosnippet>159</a>}
<a href=#160 id=160 data-nosnippet>160</a>
<a href=#161 id=161 data-nosnippet>161</a><span class="doccomment">/// convert `ColumnSchema` lists to it's corresponding proto type
<a href=#162 id=162 data-nosnippet>162</a></span><span class="kw">pub fn </span>column_schemas_to_proto(
<a href=#163 id=163 data-nosnippet>163</a> column_schemas: Vec&lt;ColumnSchema&gt;,
<a href=#164 id=164 data-nosnippet>164</a> primary_keys: <span class="kw-2">&amp;</span>[String],
<a href=#165 id=165 data-nosnippet>165</a>) -&gt; <span class="prelude-ty">Result</span>&lt;Vec&lt;api::v1::ColumnSchema&gt;, Error&gt; {
<a href=#166 id=166 data-nosnippet>166</a> <span class="kw">let </span>column_datatypes: Vec&lt;(ColumnDataType, <span class="prelude-ty">Option</span>&lt;ColumnDataTypeExtension&gt;)&gt; = column_schemas
<a href=#167 id=167 data-nosnippet>167</a> .iter()
<a href=#168 id=168 data-nosnippet>168</a> .map(|c| {
<a href=#169 id=169 data-nosnippet>169</a> ColumnDataTypeWrapper::try_from(c.data_type.clone())
<a href=#170 id=170 data-nosnippet>170</a> .map(|w| w.to_parts())
<a href=#171 id=171 data-nosnippet>171</a> .map_err(BoxedError::new)
<a href=#172 id=172 data-nosnippet>172</a> .context(ExternalSnafu)
<a href=#173 id=173 data-nosnippet>173</a> })
<a href=#174 id=174 data-nosnippet>174</a> .try_collect()<span class="question-mark">?</span>;
<a href=#175 id=175 data-nosnippet>175</a>
<a href=#176 id=176 data-nosnippet>176</a> <span class="kw">let </span>ret = column_schemas
<a href=#177 id=177 data-nosnippet>177</a> .iter()
<a href=#178 id=178 data-nosnippet>178</a> .zip(column_datatypes)
<a href=#179 id=179 data-nosnippet>179</a> .map(|(schema, datatype)| {
<a href=#180 id=180 data-nosnippet>180</a> <span class="kw">let </span>semantic_type = <span class="kw">if </span>schema.is_time_index() {
<a href=#181 id=181 data-nosnippet>181</a> SemanticType::Timestamp
<a href=#182 id=182 data-nosnippet>182</a> } <span class="kw">else if </span>primary_keys.contains(<span class="kw-2">&amp;</span>schema.name) {
<a href=#183 id=183 data-nosnippet>183</a> SemanticType::Tag
<a href=#184 id=184 data-nosnippet>184</a> } <span class="kw">else </span>{
<a href=#185 id=185 data-nosnippet>185</a> SemanticType::Field
<a href=#186 id=186 data-nosnippet>186</a> } <span class="kw">as </span>i32;
<a href=#187 id=187 data-nosnippet>187</a>
<a href=#188 id=188 data-nosnippet>188</a> api::v1::ColumnSchema {
<a href=#189 id=189 data-nosnippet>189</a> column_name: schema.name.clone(),
<a href=#190 id=190 data-nosnippet>190</a> datatype: datatype.<span class="number">0 </span><span class="kw">as </span>i32,
<a href=#191 id=191 data-nosnippet>191</a> semantic_type,
<a href=#192 id=192 data-nosnippet>192</a> datatype_extension: datatype.<span class="number">1</span>,
<a href=#193 id=193 data-nosnippet>193</a> options: options_from_column_schema(schema),
<a href=#194 id=194 data-nosnippet>194</a> }
<a href=#195 id=195 data-nosnippet>195</a> })
<a href=#196 id=196 data-nosnippet>196</a> .collect();
<a href=#197 id=197 data-nosnippet>197</a> <span class="prelude-val">Ok</span>(ret)
<a href=#198 id=198 data-nosnippet>198</a>}
<a href=#199 id=199 data-nosnippet>199</a>
<a href=#200 id=200 data-nosnippet>200</a><span class="doccomment">/// Convert `RelationDesc` to `ColumnSchema` list,
<a href=#201 id=201 data-nosnippet>201</a>/// if the column name is not present, use `col_{idx}` as the column name
<a href=#202 id=202 data-nosnippet>202</a></span><span class="kw">pub fn </span>relation_desc_to_column_schemas_with_fallback(schema: <span class="kw-2">&amp;</span>RelationDesc) -&gt; Vec&lt;ColumnSchema&gt; {
<a href=#203 id=203 data-nosnippet>203</a> schema
<a href=#204 id=204 data-nosnippet>204</a> .typ()
<a href=#205 id=205 data-nosnippet>205</a> .column_types
<a href=#206 id=206 data-nosnippet>206</a> .clone()
<a href=#207 id=207 data-nosnippet>207</a> .into_iter()
<a href=#208 id=208 data-nosnippet>208</a> .enumerate()
<a href=#209 id=209 data-nosnippet>209</a> .map(|(idx, typ)| {
<a href=#210 id=210 data-nosnippet>210</a> <span class="kw">let </span>name = schema
<a href=#211 id=211 data-nosnippet>211</a> .names
<a href=#212 id=212 data-nosnippet>212</a> .get(idx)
<a href=#213 id=213 data-nosnippet>213</a> .cloned()
<a href=#214 id=214 data-nosnippet>214</a> .flatten()
<a href=#215 id=215 data-nosnippet>215</a> .unwrap_or(<span class="macro">format!</span>(<span class="string">"col_{}"</span>, idx));
<a href=#216 id=216 data-nosnippet>216</a> <span class="kw">let </span>ret = ColumnSchema::new(name, typ.scalar_type, typ.nullable);
<a href=#217 id=217 data-nosnippet>217</a> <span class="kw">if </span>schema.typ().time_index == <span class="prelude-val">Some</span>(idx) {
<a href=#218 id=218 data-nosnippet>218</a> ret.with_time_index(<span class="bool-val">true</span>)
<a href=#219 id=219 data-nosnippet>219</a> } <span class="kw">else </span>{
<a href=#220 id=220 data-nosnippet>220</a> ret
<a href=#221 id=221 data-nosnippet>221</a> }
<a href=#222 id=222 data-nosnippet>222</a> })
<a href=#223 id=223 data-nosnippet>223</a> .collect_vec()
<a href=#224 id=224 data-nosnippet>224</a>}
</code></pre></div></section></main></body></html>