[SPARK-38939][SQL] Support DROP [IF EXISTS] COLUMN syntax#36249
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jackierwzhang wants to merge 3 commits intoapache:masterfrom
jackierwzhang:SPARK-38939-drop-if-exists
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[SPARK-38939][SQL] Support DROP [IF EXISTS] COLUMN syntax#36249jackierwzhang wants to merge 3 commits intoapache:masterfrom jackierwzhang:SPARK-38939-drop-if-exists
jackierwzhang wants to merge 3 commits intoapache:masterfrom
jackierwzhang:SPARK-38939-drop-if-exists
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What changes were proposed in this pull request?
This PR introduces the following:
IF EXISTSsyntax forDROP COLUMN.IF EXISTSWhy are the changes needed?
Currently
ALTER TABLE ... DROP COLUMN(s) ...syntax will always throw error if the column doesn't exist. This PR would like to provide an (IF EXISTS) syntax to provide better user experience for downstream handlers (such as Delta with incoming column dropping support) that support it, and make consistent with some other DMLs such asDROP TABLE (IF EXISTS).Does this PR introduce any user-facing change?
User may now specify
ALTER TABLE xxx DROP IF EXISTS COLUMN(S) a, a.b, c.d.How was this patch tested?
Modified existing unit tests and new unit tests.