JinkunLiu commented on code in PR #27330:
URL: https://github.com/apache/flink/pull/27330#discussion_r2702341234
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flink-table/flink-table-planner/src/main/scala/org/apache/flink/table/planner/codegen/ExprCodeGenerator.scala:
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@@ -743,7 +743,11 @@ class ExprCodeGenerator(ctx: CodeGeneratorContext,
nullableInput: Boolean)
case LogicalTypeRoot.ROW | LogicalTypeRoot.STRUCTURED_TYPE =>
generateDot(ctx, operands)
- case _ => throw new CodeGenException("Expect an array, a map or a
row.")
+ case LogicalTypeRoot.VARIANT =>
+ val key = operands(1)
+ generateVariantGet(ctx, operands.head, key)
Review Comment:
Thanks for the suggestion. Handling nested access in a single codegen pass
would likely require some special-case logic in upper-level call sites, which
feels a bit hacky and harder to maintain.
For shallow cases, users can use ITEM. For deeper accesses, we plan to
provide a dedicated variantQuery facility (FLIP-521) for more efficient
multi-level extraction:
https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=349637099#FLIP521:IntegratingVariantTypeintoFlink:EnablingEfficientSemiStructuredDataProcessing-Introducebuilt-infunctionsVARIANT_VALUEandVARIANT_QUERYtoextractvaluesfromavariant
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