[SPARK-52281][SQL] Change ALTER TABLE ALTER COLUMN TYPE STRING not to apply default collation if original data type was instance of StringType
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ilicmarkodb
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ALTER TABLE ALTER COLUMN TYPE STRING not to apply default collation if original data type was instance of StringTypeALTER TABLE ALTER COLUMN TYPE STRING not to apply default collation if original data type was instance of StringType
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@cloud-fan can you please review? |
sql/core/src/test/scala/org/apache/spark/sql/collation/DefaultCollationTestSuite.scala
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sql/core/src/test/scala/org/apache/spark/sql/collation/DefaultCollationTestSuite.scala
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sql/core/src/test/scala/org/apache/spark/sql/collation/DefaultCollationTestSuite.scala
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...rc/main/scala/org/apache/spark/sql/catalyst/analysis/ApplyDefaultCollationToStringType.scala
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ilicmarkodb
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May 26, 2025
sql/core/src/test/scala/org/apache/spark/sql/execution/command/CharVarcharDDLTestBase.scala
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cloud-fan
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May 27, 2025
| * Query Example: | ||
| * {{{ | ||
| * CREATE TABLE t (c1 STRING COLLATE UNICODE) | ||
| * ALTER TABLE t ALTER COLUMN c1 TYPE STRING -- c1 will remain STRING COLLATE UNICODE |
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Where does this behavior come from? It looks a special case where we inherit the collation from the previous column type if it's a string type. How about nested string type in struct type?
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What changes were proposed in this pull request?
Changed
ALTER TABLE ALTER COLUMN TYPE STRINGnot to apply default collation if original data type was instance ofStringType.Why are the changes needed?
Bug fix.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Tests added to
DefaultCollationTestSuite.Was this patch authored or co-authored using generative AI tooling?
No.