HIVE-24635: Support Values clause as operand of set operation #1869
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What changes were proposed in this pull request?
valuesSource
rule alternative fromqueryStatementExpression
parser rule toatomSelectStatement
valuesClause
rule alternative fromregularBody
since it is covered throughselectStatement
->atomSelectStatement
->valuesSource
->valuesClause
Why are the changes needed?
Enable queries which has values clause as operand of set operation. See jira or
values.q
for exampleDoes this PR introduce any user-facing change?
Yes. Users can write queries which has values clause as operand of set operation. This feature was not enabled in the past and Hive thrown exception such cases. Existing queries are not affected.
How was this patch tested?