greptimedb/servers/prom_row_builder/index.html

<!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="Prometheus row-level helpers for converting proto `Rows` into Arrow `RecordBatch`es and aligning / normalizing their schemas against existing table schemas in the catalog."><title>servers::prom_row_builder - Rust</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-1ed95124.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="servers" data-themes="" data-resource-suffix="" data-rustdoc-version="1.98.1 (48a229cea 2026-09-01)" data-channel="1.98.1" data-search-js="search-9944d736.js" data-stringdex-js="stringdex-2da4960a.js" data-settings-js="settings-170eb4bf.js" ><script src="../../static.files/storage-41dd4d93.js"></script><script defer src="../sidebar-items.js"></script><script defer src="../../static.files/main-417ebf0a.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 mod"><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]--><rustdoc-topbar><h2><a href="#">Module prom_row_builder</a></h2></rustdoc-topbar><nav class="sidebar"><div class="sidebar-crate"><h2><a href="../../servers/index.html">servers</a><span class="version">1.4.0-alpha.0</span></h2></div><div class="sidebar-elems"><section id="rustdoc-toc"><h2 class="location"><a href="#">Module prom_<wbr>row_<wbr>builder</a></h2><h3><a href="#functions">Module Items</a></h3><ul class="block"><li><a href="#functions" title="Functions">Functions</a></li></ul></section><div id="rustdoc-modnav"><h2 class="in-crate"><a href="../index.html">In crate servers</a></h2></div></div></nav><div class="sidebar-resizer" title="Drag to resize sidebar"></div><main><div class="width-limiter"><section id="main-content" class="content" tabindex="-1"><div class="main-heading"><div class="rustdoc-breadcrumbs"><a href="../index.html">servers</a></div><h1>Module <span>prom_<wbr>row_<wbr>builder</span>&nbsp;<button id="copy-path" title="Copy item path to clipboard">Copy item path</button></h1><rustdoc-toolbar></rustdoc-toolbar><span class="sub-heading"><a class="src" href="../../src/servers/prom_row_builder.rs.html#15-767">Source</a> </span></div><details class="toggle top-doc" open><summary class="hideme"><span>Expand description</span></summary><div class="docblock"><p>Prometheus row-level helpers for converting proto <code>Rows</code> into Arrow
<code>RecordBatch</code>es and aligning / normalizing their schemas against
existing table schemas in the catalog.</p>
</div></details><h2 id="functions" class="section-header">Functions<a href="#functions" class="anchor">§</a></h2><dl class="item-table"><dt><a class="fn" href="fn.arrow_time_unit.html" title="fn servers::prom_row_builder::arrow_time_unit">arrow_<wbr>time_<wbr>unit</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Converts an arrow time unit to the common time unit.</dd><dt><a class="fn" href="fn.build_arrow_array.html" title="fn servers::prom_row_builder::build_arrow_array">build_<wbr>arrow_<wbr>array</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Build a single Arrow array for the given column index from proto <code>Rows</code>.</dd><dt><a class="fn" href="fn.build_prom_create_table_schema_from_proto.html" title="fn servers::prom_row_builder::build_prom_create_table_schema_from_proto">build_<wbr>prom_<wbr>create_<wbr>table_<wbr>schema_<wbr>from_<wbr>proto</a></dt><dd>Build a <code>Vec&lt;ColumnSchema&gt;</code> suitable for creating a new Prometheus logical table
directly from the proto <code>rows.schema</code>, avoiding the round-trip through Arrow schema.</dd><dt><a class="fn" href="fn.build_timestamp_array.html" title="fn servers::prom_row_builder::build_timestamp_array">build_<wbr>timestamp_<wbr>array</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Builds a timestamp array of <code>T</code>’s unit from a proto column, appending
each value directly into the builder. Values already in the target unit
are appended without conversion (the unchanged-unit fast path); others
are converted via <code>Timestamp::convert_to</code>, flooring on narrowing.</dd><dt><a class="fn" href="fn.identify_missing_columns_from_proto.html" title="fn servers::prom_row_builder::identify_missing_columns_from_proto">identify_<wbr>missing_<wbr>columns_<wbr>from_<wbr>proto</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Identify tag columns in the proto <code>rows_schema</code> that are absent from the
target region schema, without building an intermediate <code>RecordBatch</code>.</dd><dt><a class="fn" href="fn.rows_to_aligned_record_batch.html" title="fn servers::prom_row_builder::rows_to_aligned_record_batch">rows_<wbr>to_<wbr>aligned_<wbr>record_<wbr>batch</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Directly converts proto <code>Rows</code> into a <code>RecordBatch</code> aligned to the given
<code>target_schema</code>, handling Prometheus column renaming (timestamp/value),
reordering, type casting, and null-filling in a single pass.</dd><dt><a class="fn" href="fn.unzip_logical_region_schema.html" title="fn servers::prom_row_builder::unzip_logical_region_schema">unzip_<wbr>logical_<wbr>region_<wbr>schema</a><span title="Restricted Visibility">&nbsp;🔒</span> </dt><dd>Extract timestamp, field, and tag column names from a logical region schema.</dd></dl></section></div></main></body></html>