cloud-fan commented on a change in pull request #26182: [SPARK-29523][SQL] SHOW
COLUMNS should do multi-catalog resolution.
URL: https://github.com/apache/spark/pull/26182#discussion_r336823683
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File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
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@@ -192,7 +192,7 @@ statement
LIKE pattern=STRING partitionSpec?
#showTable
| SHOW TBLPROPERTIES table=tableIdentifier
('(' key=tablePropertyKey ')')?
#showTblProperties
- | SHOW COLUMNS (FROM | IN) tableIdentifier
+ | SHOW COLUMNS (FROM | IN) multipartIdentifier
((FROM | IN) db=errorCapturingIdentifier)?
#showColumns
Review comment:
https://mariadb.com/kb/en/library/show-columns/
It seems like when `(FROM | IN) db` is specific, the table name must be a
single part. Shall we enforce it as well?
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