huaxingao commented on a change in pull request #34497:
URL: https://github.com/apache/spark/pull/34497#discussion_r746884779
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File path:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4
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@@ -598,6 +598,11 @@ fromClause
: FROM relation (',' relation)* lateralView* pivotClause?
;
+asOf
Review comment:
renamed to `temporalClause`. Also added `SYSTEM_TIME` and
`SYSTEM_VERSION` for compatibility with HIVE `as of` syntax
https://issues.apache.org/jira/browse/HIVE-25344 and temporal features in
SQL2011
https://sigmodrecord.org/publications/sigmodRecord/1209/pdfs/07.industry.kulkarni.pdf
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