qlong opened a new pull request, #54394:
URL: https://github.com/apache/spark/pull/54394
Add a VariantGet case in V2ExpressionBuilder.generateExpression() so that
variant_get and try_variant_get predicates can be translated into V2
UserDefinedScalarFunc and pushed down to connectors via
SupportsPushDownV2Filters.
This is to support file-level skipping for shredded variant columns in
Iceberg. Only foldable paths and direct table column references for the variant
column are supported.
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### What changes were proposed in this pull request?
Add a VariantGet case in V2ExpressionBuilder.generateExpression() so that
variant_get and try_variant_get predicates can be translated into V2
UserDefinedScalarFunc and pushed down to connectors via
SupportsPushDownV2Filters.
Jira: https://issues.apache.org/jira/browse/SPARK-55617
### Why are the changes needed?
This is to support file-level skipping for shredded variant columns in
Iceberg. Only foldable paths and direct table column references for the variant
column are supported.
### Does this PR introduce _any_ user-facing change?
No
### How was this patch tested?
Added unit tests.
### Was this patch authored or co-authored using generative AI tooling?
Co-authored with Claude Sonnet.
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