| <!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 `arrow-avro/src/codec.rs`."><title>codec.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-46f98efaafac5295.ttf.woff2,FiraSans-Regular-018c141bf0843ffd.woff2,FiraSans-Medium-8f9a781e4970d388.woff2,SourceCodePro-Regular-562dcc5011b6de7d.ttf.woff2,SourceCodePro-Semibold-d899c5a5c4aeb14a.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-76eba96aa4d2e634.css"><link rel="stylesheet" href="../../static.files/rustdoc-dd39b87e5fcfba68.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="arrow_avro" data-themes="" data-resource-suffix="" data-rustdoc-version="1.80.0-nightly (8c127df75 2024-05-16)" data-channel="nightly" data-search-js="search-d52510db62a78183.js" data-settings-js="settings-4313503d2e1961c2.js" ><script src="../../static.files/storage-118b08c4c78b968e.js"></script><script defer src="../../static.files/src-script-e66d777a5a92e9b2.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-20a3ad099b048cf2.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-df360f571f6edeae.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-422f7d1d52889060.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-2c020d218678b618.svg"></head><body class="rustdoc src"><!--[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"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers"><a href="#1" id="1">1</a> |
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| </pre></div><pre class="rust"><code><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you under the Apache License, Version 2.0 (the |
| // "License"); you may not use this file except in compliance |
| // with the License. You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, |
| // software distributed under the License is distributed on an |
| // "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| // KIND, either express or implied. See the License for the |
| // specific language governing permissions and limitations |
| // under the License. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::schema::{Attributes, ComplexType, PrimitiveType, Record, Schema, TypeName}; |
| <span class="kw">use </span>arrow_schema::{ |
| ArrowError, DataType, Field, FieldRef, IntervalUnit, SchemaBuilder, SchemaRef, TimeUnit, |
| }; |
| <span class="kw">use </span>std::borrow::Cow; |
| <span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::sync::Arc; |
| |
| <span class="doccomment">/// Avro types are not nullable, with nullability instead encoded as a union |
| /// where one of the variants is the null type. |
| /// |
| /// To accommodate this we special case two-variant unions where one of the |
| /// variants is the null type, and use this to derive arrow's notion of nullability |
| </span><span class="attr">#[derive(Debug, Copy, Clone)] |
| </span><span class="kw">enum </span>Nulls { |
| <span class="doccomment">/// The nulls are encoded as the first union variant |
| </span>NullFirst, |
| <span class="doccomment">/// The nulls are encoded as the second union variant |
| </span>NullSecond, |
| } |
| |
| <span class="doccomment">/// An Avro datatype mapped to the arrow data model |
| </span><span class="attr">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>AvroDataType { |
| nulls: <span class="prelude-ty">Option</span><Nulls>, |
| metadata: HashMap<String, String>, |
| codec: Codec, |
| } |
| |
| <span class="kw">impl </span>AvroDataType { |
| <span class="doccomment">/// Returns an arrow [`Field`] with the given name |
| </span><span class="kw">pub fn </span>field_with_name(<span class="kw-2">&</span><span class="self">self</span>, name: <span class="kw-2">&</span>str) -> Field { |
| <span class="kw">let </span>d = <span class="self">self</span>.codec.data_type(); |
| Field::new(name, d, <span class="self">self</span>.nulls.is_some()).with_metadata(<span class="self">self</span>.metadata.clone()) |
| } |
| } |
| |
| <span class="doccomment">/// A named [`AvroDataType`] |
| </span><span class="attr">#[derive(Debug, Clone)] |
| </span><span class="kw">pub struct </span>AvroField { |
| name: String, |
| data_type: AvroDataType, |
| } |
| |
| <span class="kw">impl </span>AvroField { |
| <span class="doccomment">/// Returns the arrow [`Field`] |
| </span><span class="kw">pub fn </span>field(<span class="kw-2">&</span><span class="self">self</span>) -> Field { |
| <span class="self">self</span>.data_type.field_with_name(<span class="kw-2">&</span><span class="self">self</span>.name) |
| } |
| |
| <span class="doccomment">/// Returns the [`Codec`] |
| </span><span class="kw">pub fn </span>codec(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="kw-2">&</span>Codec { |
| <span class="kw-2">&</span><span class="self">self</span>.data_type.codec |
| } |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> TryFrom<<span class="kw-2">&</span>Schema<<span class="lifetime">'a</span>>> <span class="kw">for </span>AvroField { |
| <span class="kw">type </span>Error = ArrowError; |
| |
| <span class="kw">fn </span>try_from(schema: <span class="kw-2">&</span>Schema<<span class="lifetime">'a</span>>) -> <span class="prelude-ty">Result</span><<span class="self">Self</span>, <span class="self">Self</span>::Error> { |
| <span class="kw">match </span>schema { |
| Schema::Complex(ComplexType::Record(r)) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>resolver = Resolver::default(); |
| <span class="kw">let </span>data_type = make_data_type(schema, <span class="prelude-val">None</span>, <span class="kw-2">&mut </span>resolver)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(AvroField { |
| data_type, |
| name: r.name.to_string(), |
| }) |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(ArrowError::ParseError(<span class="macro">format!</span>( |
| <span class="string">"Expected record got {schema:?}" |
| </span>))), |
| } |
| } |
| } |
| |
| <span class="doccomment">/// An Avro encoding |
| /// |
| /// <https://avro.apache.org/docs/1.11.1/specification/#encodings> |
| </span><span class="attr">#[derive(Debug, Clone)] |
| </span><span class="kw">pub enum </span>Codec { |
| Null, |
| Boolean, |
| Int32, |
| Int64, |
| Float32, |
| Float64, |
| Binary, |
| Utf8, |
| Date32, |
| TimeMillis, |
| TimeMicros, |
| <span class="doccomment">/// TimestampMillis(is_utc) |
| </span>TimestampMillis(bool), |
| <span class="doccomment">/// TimestampMicros(is_utc) |
| </span>TimestampMicros(bool), |
| Fixed(i32), |
| List(Arc<AvroDataType>), |
| Struct(Arc<[AvroField]>), |
| Duration, |
| } |
| |
| <span class="kw">impl </span>Codec { |
| <span class="kw">fn </span>data_type(<span class="kw-2">&</span><span class="self">self</span>) -> DataType { |
| <span class="kw">match </span><span class="self">self </span>{ |
| <span class="self">Self</span>::Null => DataType::Null, |
| <span class="self">Self</span>::Boolean => DataType::Boolean, |
| <span class="self">Self</span>::Int32 => DataType::Int32, |
| <span class="self">Self</span>::Int64 => DataType::Int64, |
| <span class="self">Self</span>::Float32 => DataType::Float32, |
| <span class="self">Self</span>::Float64 => DataType::Float64, |
| <span class="self">Self</span>::Binary => DataType::Binary, |
| <span class="self">Self</span>::Utf8 => DataType::Utf8, |
| <span class="self">Self</span>::Date32 => DataType::Date32, |
| <span class="self">Self</span>::TimeMillis => DataType::Time32(TimeUnit::Millisecond), |
| <span class="self">Self</span>::TimeMicros => DataType::Time64(TimeUnit::Microsecond), |
| <span class="self">Self</span>::TimestampMillis(is_utc) => { |
| DataType::Timestamp(TimeUnit::Millisecond, is_utc.then(|| <span class="string">"+00:00"</span>.into())) |
| } |
| <span class="self">Self</span>::TimestampMicros(is_utc) => { |
| DataType::Timestamp(TimeUnit::Microsecond, is_utc.then(|| <span class="string">"+00:00"</span>.into())) |
| } |
| <span class="self">Self</span>::Duration => DataType::Interval(IntervalUnit::MonthDayNano), |
| <span class="self">Self</span>::Fixed(size) => DataType::FixedSizeBinary(<span class="kw-2">*</span>size), |
| <span class="self">Self</span>::List(f) => DataType::List(Arc::new(f.field_with_name(<span class="string">"item"</span>))), |
| <span class="self">Self</span>::Struct(f) => DataType::Struct(f.iter().map(|x| x.field()).collect()), |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>From<PrimitiveType> <span class="kw">for </span>Codec { |
| <span class="kw">fn </span>from(value: PrimitiveType) -> <span class="self">Self </span>{ |
| <span class="kw">match </span>value { |
| PrimitiveType::Null => <span class="self">Self</span>::Null, |
| PrimitiveType::Boolean => <span class="self">Self</span>::Boolean, |
| PrimitiveType::Int => <span class="self">Self</span>::Int32, |
| PrimitiveType::Long => <span class="self">Self</span>::Int64, |
| PrimitiveType::Float => <span class="self">Self</span>::Float32, |
| PrimitiveType::Double => <span class="self">Self</span>::Float64, |
| PrimitiveType::Bytes => <span class="self">Self</span>::Binary, |
| PrimitiveType::String => <span class="self">Self</span>::Utf8, |
| } |
| } |
| } |
| |
| <span class="doccomment">/// Resolves Avro type names to [`AvroDataType`] |
| /// |
| /// See <https://avro.apache.org/docs/1.11.1/specification/#names> |
| </span><span class="attr">#[derive(Debug, Default)] |
| </span><span class="kw">struct </span>Resolver<<span class="lifetime">'a</span>> { |
| map: HashMap<(<span class="kw-2">&</span><span class="lifetime">'a </span>str, <span class="kw-2">&</span><span class="lifetime">'a </span>str), AvroDataType>, |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> Resolver<<span class="lifetime">'a</span>> { |
| <span class="kw">fn </span>register(<span class="kw-2">&mut </span><span class="self">self</span>, name: <span class="kw-2">&</span><span class="lifetime">'a </span>str, namespace: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str>, schema: AvroDataType) { |
| <span class="self">self</span>.map.insert((name, namespace.unwrap_or(<span class="string">""</span>)), schema); |
| } |
| |
| <span class="kw">fn </span>resolve(<span class="kw-2">&</span><span class="self">self</span>, name: <span class="kw-2">&</span>str, namespace: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str>) -> <span class="prelude-ty">Result</span><AvroDataType, ArrowError> { |
| <span class="kw">let </span>(namespace, name) = name |
| .rsplit_once(<span class="string">'.'</span>) |
| .unwrap_or_else(|| (namespace.unwrap_or(<span class="string">""</span>), name)); |
| |
| <span class="self">self</span>.map |
| .get(<span class="kw-2">&</span>(namespace, name)) |
| .ok_or_else(|| ArrowError::ParseError(<span class="macro">format!</span>(<span class="string">"Failed to resolve {namespace}.{name}"</span>))) |
| .cloned() |
| } |
| } |
| |
| <span class="doccomment">/// Parses a [`AvroDataType`] from the provided [`Schema`] and the given `name` and `namespace` |
| /// |
| /// `name`: is name used to refer to `schema` in its parent |
| /// `namespace`: an optional qualifier used as part of a type hierarchy |
| /// |
| /// See [`Resolver`] for more information |
| </span><span class="kw">fn </span>make_data_type<<span class="lifetime">'a</span>>( |
| schema: <span class="kw-2">&</span>Schema<<span class="lifetime">'a</span>>, |
| namespace: <span class="prelude-ty">Option</span><<span class="kw-2">&</span><span class="lifetime">'a </span>str>, |
| resolver: <span class="kw-2">&mut </span>Resolver<<span class="lifetime">'a</span>>, |
| ) -> <span class="prelude-ty">Result</span><AvroDataType, ArrowError> { |
| <span class="kw">match </span>schema { |
| Schema::TypeName(TypeName::Primitive(p)) => <span class="prelude-val">Ok</span>(AvroDataType { |
| nulls: <span class="prelude-val">None</span>, |
| metadata: Default::default(), |
| codec: (<span class="kw-2">*</span>p).into(), |
| }), |
| Schema::TypeName(TypeName::Ref(name)) => resolver.resolve(name, namespace), |
| Schema::Union(f) => { |
| <span class="comment">// Special case the common case of nullable primitives |
| </span><span class="kw">let </span>null = f |
| .iter() |
| .position(|x| x == <span class="kw-2">&</span>Schema::TypeName(TypeName::Primitive(PrimitiveType::Null))); |
| <span class="kw">match </span>(f.len() == <span class="number">2</span>, null) { |
| (<span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="number">0</span>)) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>field = make_data_type(<span class="kw-2">&</span>f[<span class="number">1</span>], namespace, resolver)<span class="question-mark">?</span>; |
| field.nulls = <span class="prelude-val">Some</span>(Nulls::NullFirst); |
| <span class="prelude-val">Ok</span>(field) |
| } |
| (<span class="bool-val">true</span>, <span class="prelude-val">Some</span>(<span class="number">1</span>)) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>field = make_data_type(<span class="kw-2">&</span>f[<span class="number">0</span>], namespace, resolver)<span class="question-mark">?</span>; |
| field.nulls = <span class="prelude-val">Some</span>(Nulls::NullSecond); |
| <span class="prelude-val">Ok</span>(field) |
| } |
| <span class="kw">_ </span>=> <span class="prelude-val">Err</span>(ArrowError::NotYetImplemented(<span class="macro">format!</span>( |
| <span class="string">"Union of {f:?} not currently supported" |
| </span>))), |
| } |
| } |
| Schema::Complex(c) => <span class="kw">match </span>c { |
| ComplexType::Record(r) => { |
| <span class="kw">let </span>namespace = r.namespace.or(namespace); |
| <span class="kw">let </span>fields = r |
| .fields |
| .iter() |
| .map(|field| { |
| <span class="prelude-val">Ok</span>(AvroField { |
| name: field.name.to_string(), |
| data_type: make_data_type(<span class="kw-2">&</span>field.r#type, namespace, resolver)<span class="question-mark">?</span>, |
| }) |
| }) |
| .collect::<<span class="prelude-ty">Result</span><<span class="kw">_</span>, ArrowError>>()<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>field = AvroDataType { |
| nulls: <span class="prelude-val">None</span>, |
| codec: Codec::Struct(fields), |
| metadata: r.attributes.field_metadata(), |
| }; |
| resolver.register(r.name, namespace, field.clone()); |
| <span class="prelude-val">Ok</span>(field) |
| } |
| ComplexType::Array(a) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>field = make_data_type(a.items.as_ref(), namespace, resolver)<span class="question-mark">?</span>; |
| <span class="prelude-val">Ok</span>(AvroDataType { |
| nulls: <span class="prelude-val">None</span>, |
| metadata: a.attributes.field_metadata(), |
| codec: Codec::List(Arc::new(field)), |
| }) |
| } |
| ComplexType::Fixed(f) => { |
| <span class="kw">let </span>size = f.size.try_into().map_err(|e| { |
| ArrowError::ParseError(<span class="macro">format!</span>(<span class="string">"Overflow converting size to i32: {e}"</span>)) |
| })<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span>field = AvroDataType { |
| nulls: <span class="prelude-val">None</span>, |
| metadata: f.attributes.field_metadata(), |
| codec: Codec::Fixed(size), |
| }; |
| resolver.register(f.name, namespace, field.clone()); |
| <span class="prelude-val">Ok</span>(field) |
| } |
| ComplexType::Enum(e) => <span class="prelude-val">Err</span>(ArrowError::NotYetImplemented(<span class="macro">format!</span>( |
| <span class="string">"Enum of {e:?} not currently supported" |
| </span>))), |
| ComplexType::Map(m) => <span class="prelude-val">Err</span>(ArrowError::NotYetImplemented(<span class="macro">format!</span>( |
| <span class="string">"Map of {m:?} not currently supported" |
| </span>))), |
| }, |
| Schema::Type(t) => { |
| <span class="kw">let </span><span class="kw-2">mut </span>field = |
| make_data_type(<span class="kw-2">&</span>Schema::TypeName(t.r#type.clone()), namespace, resolver)<span class="question-mark">?</span>; |
| |
| <span class="comment">// https://avro.apache.org/docs/1.11.1/specification/#logical-types |
| </span><span class="kw">match </span>(t.attributes.logical_type, <span class="kw-2">&mut </span>field.codec) { |
| (<span class="prelude-val">Some</span>(<span class="string">"decimal"</span>), c @ Codec::Fixed(<span class="kw">_</span>)) => { |
| <span class="kw">return </span><span class="prelude-val">Err</span>(ArrowError::NotYetImplemented( |
| <span class="string">"Decimals are not currently supported"</span>.to_string(), |
| )) |
| } |
| (<span class="prelude-val">Some</span>(<span class="string">"date"</span>), c @ Codec::Int32) => <span class="kw-2">*</span>c = Codec::Date32, |
| (<span class="prelude-val">Some</span>(<span class="string">"time-millis"</span>), c @ Codec::Int32) => <span class="kw-2">*</span>c = Codec::TimeMillis, |
| (<span class="prelude-val">Some</span>(<span class="string">"time-micros"</span>), c @ Codec::Int64) => <span class="kw-2">*</span>c = Codec::TimeMicros, |
| (<span class="prelude-val">Some</span>(<span class="string">"timestamp-millis"</span>), c @ Codec::Int64) => <span class="kw-2">*</span>c = Codec::TimestampMillis(<span class="bool-val">true</span>), |
| (<span class="prelude-val">Some</span>(<span class="string">"timestamp-micros"</span>), c @ Codec::Int64) => <span class="kw-2">*</span>c = Codec::TimestampMicros(<span class="bool-val">true</span>), |
| (<span class="prelude-val">Some</span>(<span class="string">"local-timestamp-millis"</span>), c @ Codec::Int64) => { |
| <span class="kw-2">*</span>c = Codec::TimestampMillis(<span class="bool-val">false</span>) |
| } |
| (<span class="prelude-val">Some</span>(<span class="string">"local-timestamp-micros"</span>), c @ Codec::Int64) => { |
| <span class="kw-2">*</span>c = Codec::TimestampMicros(<span class="bool-val">false</span>) |
| } |
| (<span class="prelude-val">Some</span>(<span class="string">"duration"</span>), c @ Codec::Fixed(<span class="number">12</span>)) => <span class="kw-2">*</span>c = Codec::Duration, |
| (<span class="prelude-val">Some</span>(logical), <span class="kw">_</span>) => { |
| <span class="comment">// Insert unrecognized logical type into metadata map |
| </span>field.metadata.insert(<span class="string">"logicalType"</span>.into(), logical.into()); |
| } |
| (<span class="prelude-val">None</span>, <span class="kw">_</span>) => {} |
| } |
| |
| <span class="kw">if </span>!t.attributes.additional.is_empty() { |
| <span class="kw">for </span>(k, v) <span class="kw">in </span><span class="kw-2">&</span>t.attributes.additional { |
| field.metadata.insert(k.to_string(), v.to_string()); |
| } |
| } |
| <span class="prelude-val">Ok</span>(field) |
| } |
| } |
| } |
| </code></pre></div></section></main></body></html> |
