[SPARK-49110][SQL] Fix reading metadata columns for tables with CHAR columns #51154
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What changes were proposed in this pull request?
This PR modifies
SubqueryAliasto propagate the metadata output of its child if the is aProjectinjected byApplyCharTypePadding.Why are the changes needed?
This is needed because with these changes it is not possible to read metadata columns when reading a table with a CHAR column when read-side padding is enabled. In the case the plan is
SubqueryAlias(Project(LeafNode))), so without this patch the metadata output is not propagated.Does this PR introduce any user-facing change?
Yes, there will be more cases in which the metadata columns can be accessed, and users will no longer get an exception in these cases.
How was this patch tested?
Added a case to
MetadataColumnSuite.Was this patch authored or co-authored using generative AI tooling?
No