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split out MDA into a separate library
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,95 @@ | ||
| using System; | ||
| using System.Collections.Generic; | ||
| using System.IO; | ||
| using System.Linq; | ||
| using System.Reflection; | ||
| using System.Text; | ||
| using System.Threading; | ||
| using System.Threading.Tasks; | ||
| using Microsoft.Data.Analysis; | ||
| using Parquet.Data; | ||
| using Parquet.Data.Analysis; | ||
| using Parquet.Schema; | ||
|
|
||
| namespace Parquet { | ||
| /// <summary> | ||
| /// Defines extension methods to simplify Parquet usage | ||
| /// </summary> | ||
| public static class AnalysisExtensions { | ||
| /// <summary> | ||
| /// | ||
| /// </summary> | ||
| /// <param name="inputStream"></param> | ||
| /// <param name="cancellationToken"></param> | ||
| /// <returns></returns> | ||
| public static async Task<DataFrame> ReadParquetAsDataFrameAsync( | ||
| this Stream inputStream, CancellationToken cancellationToken = default) { | ||
| using ParquetReader reader = await ParquetReader.CreateAsync(inputStream, cancellationToken: cancellationToken); | ||
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| var dfcs = new List<DataFrameColumn>(); | ||
| //var readableFields = reader.Schema.DataFields.Where(df => df.MaxRepetitionLevel == 0).ToList(); | ||
| List<DataField> readableFields = reader.Schema.Fields | ||
| .Select(df => df as DataField) | ||
| .Where(df => df != null) | ||
| .Cast<DataField>() | ||
| .ToList(); | ||
| var columns = new List<DataFrameColumn>(); | ||
|
|
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| for(int rowGroupIndex = 0; rowGroupIndex < reader.RowGroupCount; rowGroupIndex++) { | ||
| using ParquetRowGroupReader rgr = reader.OpenRowGroupReader(rowGroupIndex); | ||
|
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| for(int dataFieldIndex = 0; dataFieldIndex < readableFields.Count; dataFieldIndex++) { | ||
| DataColumn dc = await rgr.ReadColumnAsync(readableFields[dataFieldIndex], cancellationToken); | ||
|
|
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| if(rowGroupIndex == 0) { | ||
| dfcs.Add(DataFrameMapper.ToDataFrameColumn(dc)); | ||
| } else { | ||
| DataFrameMapper.AppendValues(dfcs[dataFieldIndex], dc); | ||
| } | ||
| } | ||
| } | ||
|
|
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| return new DataFrame(dfcs); | ||
| } | ||
|
|
||
| /// <summary> | ||
| /// | ||
| /// </summary> | ||
| /// <param name="df"></param> | ||
| /// <param name="outputStream"></param> | ||
| /// <param name="cancellationToken"></param> | ||
| /// <returns></returns> | ||
| public static async Task WriteAsync(this DataFrame df, Stream outputStream, CancellationToken cancellationToken = default) { | ||
| // create schema | ||
| var schema = new ParquetSchema( | ||
| df.Columns.Select(col => new DataField(col.Name, col.DataType.GetNullable()))); | ||
|
|
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| using ParquetWriter writer = await ParquetWriter.CreateAsync(schema, outputStream, cancellationToken: cancellationToken); | ||
| using ParquetRowGroupWriter rgw = writer.CreateRowGroup(); | ||
|
|
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| int i = 0; | ||
| foreach(DataFrameColumn? col in df.Columns) { | ||
| if(col == null) | ||
| throw new InvalidOperationException("unexpected null column"); | ||
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| Array data = DataFrameMapper.GetTypedDataFast(col); | ||
| var parquetColumn = new DataColumn(schema.DataFields[i], data); | ||
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| await rgw.WriteColumnAsync(parquetColumn, cancellationToken); | ||
|
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| i += 1; | ||
| } | ||
| } | ||
|
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| static Type GetNullable(this Type t) { | ||
| TypeInfo ti = t.GetTypeInfo(); | ||
|
|
||
| if(ti.IsClass) { | ||
| return t; | ||
| } | ||
|
|
||
| Type nt = typeof(Nullable<>); | ||
| return nt.MakeGenericType(t); | ||
| } | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| <Project Sdk="Microsoft.NET.Sdk"> | ||
|
|
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| <PropertyGroup> | ||
| <TargetFrameworks>net8.0;net6.0;netstandard2.1;netstandard2.0</TargetFrameworks> | ||
| <Company></Company> | ||
| <PackageId>Parquet.Net.Data.Analysis</PackageId> | ||
| <GenerateDocumentationFile>true</GenerateDocumentationFile> | ||
| <AllowUnsafeBlocks>true</AllowUnsafeBlocks> | ||
| <TreatWarningsAsErrors>true</TreatWarningsAsErrors> | ||
| <WarningsAsErrors /> | ||
| <DocumentationFile>bin\Debug\$(TargetFramework)\Parquet.Net.Data.Analysis.xml</DocumentationFile> | ||
| <DebugType>full</DebugType> | ||
| <DebugSymbols>true</DebugSymbols> | ||
| <PackageTags>apache parquet dotnet core net c# f# windows linux macos ios android xboxone xbox</PackageTags> | ||
| <LangVersion>latest</LangVersion> | ||
| <Nullable>enable</Nullable> | ||
|
|
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| </PropertyGroup> | ||
|
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| <ItemGroup> | ||
| <ProjectReference Include="..\Parquet\Parquet.csproj" /> | ||
| </ItemGroup> | ||
|
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| <ItemGroup> | ||
| <PackageReference Include="Microsoft.Data.Analysis" Version="0.21.1" /> | ||
| </ItemGroup> | ||
|
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| <ItemGroup> | ||
| <Compile Update="DataFrameMapper.cs"> | ||
| <DependentUpon>DataFrameMapper.tt</DependentUpon> | ||
| <DesignTime>True</DesignTime> | ||
| <AutoGen>True</AutoGen> | ||
| </Compile> | ||
| </ItemGroup> | ||
|
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| <ItemGroup> | ||
| <None Update="DataFrameMapper.tt"> | ||
| <LastGenOutput>DataFrameMapper.cs</LastGenOutput> | ||
| <Generator>TextTemplatingFileGenerator</Generator> | ||
| </None> | ||
| </ItemGroup> | ||
|
|
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|
|
||
|
|
||
| </Project> |
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