Relax `Patch(record, updates...)` field-type strictness and preserve unioned record shape by Copilot · Pull Request #3063 · microsoft/Power-Fx

Copilot · 2026-05-19T18:13:28Z

Patch({a:1,b:"hello"}, {a:3,b:4}) failed because the record overload required exact type matches for overlapping fields across update records. This change relaxes that rule so record patching can evolve field types while still computing a consistent return record type.

Record-overload type-checking change
- Updated PatchRecordFunction.CheckTypes to stop rejecting updates when an existing field appears with a different type.
- Kept non-record argument validation intact.
- Return type is now derived by unioning base/update record types across all update arguments, even when overlapping field kinds differ.
Regression coverage for record patching
- Added focused tests in TexlTests.cs for:
  - literal record patching with new and overlapping fields
  - overlapping field type changes (e.g., b:n -> b:s)
  - variable-based record patching, including Unknown ($) fields
- Updated variable-based test inputs to pass variable names explicitly (avoids brittle parsing from expression text).

Patch({a:1, b:2}, {b:"3", c:4})
// now binds as: ![a:n, b:s, c:n]

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- Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/Power-Fx/Power-Fx/src/Microsoft.PowerFx.sln --packages /tmp/codeql-scratch-65e5a7552fae7ad7/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/tmp/codeql-scratch-65e5a7552fae7ad7/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/tmp/codeql-scratch-65e5a7552fae7ad7/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true (dns block)
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- Triggering command: /usr/bin/dotnet dotnet restore --no-dependencies /home/REDACTED/work/Power-Fx/Power-Fx/src/Microsoft.PowerFx.sln --packages /tmp/codeql-scratch-65e5a7552fae7ad7/dbs/csharp/working/packages /p:DisableImplicitNuGetFallbackFolder=true --verbosity normal /p:TargetFrameworkRootPath=/tmp/codeql-scratch-65e5a7552fae7ad7/dbs/csharp/working/emptyFakeDotnetRoot /p:NetCoreTargetingPackRoot=/tmp/codeql-scratch-65e5a7552fae7ad7/dbs/csharp/working/emptyFakeDotnetRoot /p:AllowMissingPrunePackageData=true (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter FullyQualifiedName~TestPatchRecordFunction --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter FullyQualifiedName~TestPatchRecordFunction --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter FullyQualifiedName~TestPatchRecordFunction --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter FullyQualifiedName~TestPatchRecordFunction --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter FullyQualifiedName~TestPatchRecordFunction --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
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- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
- Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/Power-Fx/Power-Fx/src/tests/.Net7.0/Microsoft.PowerFx.Core.Tests/Microsoft.PowerFx.Core.Tests.csproj --filter TestPatchRecordFunction|TexlPatchWithDataSourceArgumentValidation --nologo (dns block)
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Agent-Logs-Url: https://github.com/microsoft/Power-Fx/sessions/06ca3f33-4583-4197-9410-940f498c6d89 Co-authored-by: CarlosFigueiraMSFT <44986255+CarlosFigueiraMSFT@users.noreply.github.com>

CarlosFigueiraMSFT · 2026-05-19T18:30:23Z

Please add a few entries where coercion is required to the .txt tests at src\tests\Microsoft.PowerFx.Core.Tests.Shared\ExpressionTestCases\Patch_PatchRecord.txt - and make sure that they pass

CarlosFigueiraMSFT · 2026-05-19T18:32:13Z

Please add a few entries where coercion is required to the .txt tests at src\tests\Microsoft.PowerFx.Core.Tests.Shared\ExpressionTestCases\Patch_PatchRecord.txt - and make sure that they pass

For example:

>> Patch({a:1, b:2}, {b:"3", c:4}))
{a:1,b:3,c:4}

>> Patch({a:1, b:"hello"}, {a:3, b:4})
{a:1,b:"4"}

@copilot

Initial plan

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Copilot AI assigned Copilot and CarlosFigueiraMSFT May 19, 2026

Copilot started work on behalf of CarlosFigueiraMSFT May 19, 2026 18:13 View session

Copilot AI linked an issue May 19, 2026 that may be closed by this pull request

Patch(<record1>, <record2>) should allow coercions from the second item to the first #3062

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Copilot AI and others added 2 commits May 19, 2026 18:19

Relax Patch record type matching and add regression tests

c77f003

Agent-Logs-Url: https://github.com/microsoft/Power-Fx/sessions/06ca3f33-4583-4197-9410-940f498c6d89 Co-authored-by: CarlosFigueiraMSFT <44986255+CarlosFigueiraMSFT@users.noreply.github.com>

Harden Patch variable regression tests input setup

2b344c0

Agent-Logs-Url: https://github.com/microsoft/Power-Fx/sessions/06ca3f33-4583-4197-9410-940f498c6d89 Co-authored-by: CarlosFigueiraMSFT <44986255+CarlosFigueiraMSFT@users.noreply.github.com>

Copilot AI changed the title ~~[WIP] Fix Patch function to allow coercions from second item to first~~ Relax Patch(record, updates...) field-type strictness and preserve unioned record shape May 19, 2026

Copilot finished work on behalf of CarlosFigueiraMSFT May 19, 2026 18:24

Copilot AI requested a review from CarlosFigueiraMSFT May 19, 2026 18:24

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Relax `Patch(record, updates...)` field-type strictness and preserve unioned record shape#3063

Relax `Patch(record, updates...)` field-type strictness and preserve unioned record shape#3063
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Copilot AI commented May 19, 2026 •

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