[SPARK-52683][SQL] Support ExternalCatalog alterTableSchema #51373
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This was referenced Jul 4, 2025
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/ExternalCatalog.scala
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/catalog/InMemoryCatalog.scala
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| } | ||
| if (changes.exists(_.isInstanceOf[TableChange.ColumnChange])) { | ||
| catalog.alterTableDataSchema(ident.asTableIdentifier, schema) | ||
| catalog.alterTableSchema(ident.asTableIdentifier, schema) |
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ah, so the schema here is already the full schema
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yea i noticed and had a pr to fix that #51372 but we can fix both if we do this one.
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sql/core/src/main/scala/org/apache/spark/sql/execution/command/tables.scala
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thanks, merging to master! |
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What changes were proposed in this pull request?
Add a new ExternalCatalog and SessionCatalog API alterTableSchema that will supersede alterTableDataSchema.
Why are the changes needed?
Because ExternalCatalog::alterTableDataSchema takes dataSchema only (without partition columns), we lost the context of the partition column. This will make it impossible for us to support column order where partition column are not at the end.
See #51342 for context
More generally, this is a better intuitive API than alterTableDataSchema, because the caller no longer needs to strip out partition columns. Also, it is not immediately intuitive that data schema means without partition columns.
Does this PR introduce any user-facing change?
No
How was this patch tested?
Existing test, move test for alterTableDataSchema to the new API
Was this patch authored or co-authored using generative AI tooling?
No