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AVRO-2825: [csharp] Resolve: C# Logical Types throw exception on unkn… #2751

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AVRO-2825

What is the purpose of the change

  • This pull request resolves an outstanding issue with the csharp implementation behavior that is not consistent with the AVRO spec and the java behavior.
  • Per the AVRO Spec:
    • Language implementations must ignore unknown logical types when reading, and should use the underlying Avro type
  • The current csharp implementation throws an exception for unrecognized Logical Types.

NOTE: This PR WILL change the behavior of the current nuget package. It corrects it to align with the AVRO spec.

This is a new version of PR #2741 incorporating all feedback from KalleOlaviNiemitalo

Avoid swallowing any exceptions thrown for other reasons.
Allow applications to parse a schema and read the name of the logical type from LogicalSchema.LogicalTypeName (or even LogicalType.Name) regardless of whether the library recognizes it.
Allow applications to parse a schema and serialize it back to JSON without losing the unrecognized logical types here:
LogicalSchema.LogicalType could then be null, or perhaps an instance of a new NotSupportedLogicalType class that would pass everything through without conversion. (I created a new type: UnknownLogicalType)

Verifying this change

This change is already covered by existing tests:

  • test > AvroGen > AvroGenSchemaTests.cs > NotSupportedSchema

    • corrected expected result of Test
  • test > Schema > SchemaTests.cs > TestUnknownLogical

    • corrected expected result of Test

This change added tests and can be verified as follows:

  • test > Util > LogicalTypeTests.cs > TestUnknownLogicalType
    • added more complex test to confirm underlying AVRO base type is used.

Documentation

  • Does this pull request introduce a new feature? (no)

@github-actions github-actions bot added the C# label Feb 19, 2024
@TomBruns
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resolved all identified issues in new PR

@martin-g
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We need a C# developer/user to review the changes.

@TomBruns
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Is there something I need to do to allow this PR to move forward?

/// </summary>
/// <param name="nullible">A flag indicating whether it should be nullible.</param>
/// <returns>Type.</returns>
public override Type GetCSharpType(bool nullible)
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@a-kalashnikov a-kalashnikov Apr 7, 2024

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perhaps you meant nullable instead of nullible?

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I agree with your comment but that name pre-existed in many files in this codebase so I choose to be consistent.

@TomBruns
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TomBruns commented Apr 8, 2024

I am not sure why this still shows are changes requested, they all have been made to my knowledge.

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TomBruns commented Apr 8, 2024

all changes made

@TomBruns TomBruns closed this Apr 8, 2024
@TomBruns TomBruns reopened this Apr 8, 2024
@martin-g martin-g dismissed their stale review April 9, 2024 12:35

A C# dev should take a look

@martin-g martin-g requested a review from zcsizmadia April 9, 2024 12:44
@zcsizmadia
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LGTM. Thanks @TomBruns!

@@ -45,7 +45,7 @@ private LogicalTypeFactory()
{ TimeMicrosecond.LogicalTypeName, new TimeMicrosecond() },
{ TimestampMillisecond.LogicalTypeName, new TimestampMillisecond() },
{ TimestampMicrosecond.LogicalTypeName, new TimestampMicrosecond() },
{ Uuid.LogicalTypeName, new Uuid() }
{ Uuid.LogicalTypeName, new Uuid() },
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Remove comma plz

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