[SPARK-53553][CONNECT] Fix handling of null values in LiteralValueProtoConverter #52310
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cloud-fan
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sql/connect/client/jvm/src/test/scala/org/apache/spark/sql/PlanGenerationTestSuite.scala
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...t/common/src/main/scala/org/apache/spark/sql/connect/common/LiteralValueProtoConverter.scala
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What changes were proposed in this pull request?
This PR fixes the handling of null literal values in
LiteralValueProtoConverterfor Spark Connect. The main changes include:Added proper null value handling: Created a new
setNullValuemethod that correctly sets null values in proto literals with appropriate data type information.Reordered pattern matching: Moved null and Option handling to the top of the pattern matching in
toLiteralProtoBuilderInternalto ensure null values are processed before other type-specific logic.Fixed converter logic: Updated the
getScalaConvertermethod to properly handle null values by checkinghasNullbefore applying type-specific conversion logic.Why are the changes needed?
The previous implementation had several issues with null value handling:
Incorrect null processing order: Null values were being processed after type-specific logic, which could lead to exceptions.
Missing null checks in converters: The converter functions didn't properly check for null values before applying type-specific conversion logic.
Does this PR introduce any user-facing change?
Yes. This PR fixes a bug where null values in literals (especially in arrays and maps) were not being properly handled in Spark Connect. Users who were experiencing issues with null value serialization in complex types should now see correct behavior.
How was this patch tested?
build/sbt "connect-client-jvm/testOnly *ClientE2ETestSuite -- -z SPARK-53553"build/sbt "connect/testOnly *LiteralExpressionProtoConverterSuite"build/sbt "connect-client-jvm/testOnly org.apache.spark.sql.PlanGenerationTestSuite"build/sbt "connect/testOnly org.apache.spark.sql.connect.ProtoToParsedPlanTestSuite"Was this patch authored or co-authored using generative AI tooling?
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