Internal Jenkins has submitted this change and it was merged.

Change subject: IMPALA-4336: Cast exprs after unnesting union operands.
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IMPALA-4336: Cast exprs after unnesting union operands.

The bug was that we cast the result exprs of operands before
unnesting them. If we unnested an operands, casts were missing
on those unnested operands' result exprs.

The fix is to first unnest operands and then cast result exprs.

Also clarifies the use of resultExprs vs. baseTblResultExprs.

Change-Id: I5e3ab7349df7d67d0d9c2baf4a56342d3f04e76d
Reviewed-on: http://gerrit.cloudera.org:8080/4815
Reviewed-by: Alex Behm <[email protected]>
Tested-by: Internal Jenkins
---
M fe/src/main/java/org/apache/impala/analysis/Expr.java
M fe/src/main/java/org/apache/impala/analysis/UnionStmt.java
M fe/src/main/java/org/apache/impala/planner/SingleNodePlanner.java
M fe/src/main/java/org/apache/impala/planner/UnionNode.java
M testdata/workloads/functional-query/queries/QueryTest/union.test
5 files changed, 137 insertions(+), 104 deletions(-)

Approvals:
  Internal Jenkins: Verified
  Alex Behm: Looks good to me, approved



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Gerrit-MessageType: merged
Gerrit-Change-Id: I5e3ab7349df7d67d0d9c2baf4a56342d3f04e76d
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Alex Behm <[email protected]>
Gerrit-Reviewer: Alex Behm <[email protected]>
Gerrit-Reviewer: Dimitris Tsirogiannis <[email protected]>
Gerrit-Reviewer: Internal Jenkins

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