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From "Yonghyun Hwang (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-4042: count(distinct NULL) fails on a view
Date Mon, 03 Oct 2016 19:10:11 GMT
Yonghyun Hwang has uploaded a new patch set (#2).

Change subject: IMPALA-4042: count(distinct NULL) fails on a view
......................................................................

IMPALA-4042: count(distinct NULL) fails on a view

In case of count(distinct), FunctionCallExpr.analyze() changes type
for "NULL" into "BOOLEAN" to make sure that BE doesn't see any
"NULL_TYPE" exprs. In the meantime, Expr substitution, happening in
Expr.substituteImpl() reverts this change back to original type,
"NULL_TYPE".

This causes an issue when AggregateInfo.checkConsistency() performs
precondition check where slot types from
AggregateInfo.outputTupleDesc_ should be matched with the types from
AggregateInfo.groupingExpr_. The slot type shows "BOOLEAN" while type
from groupingExpr_ is "NULL_TYPE", which makes the precondition fail
and throws an exception.

To resolve the issue, Expr.trySubstitute() is updated not to substitue
NullLiteral.

Change-Id: Icf3b4511234e473e5b9548fbf3e97f333c9980f1
---
M fe/src/main/java/org/apache/impala/analysis/Expr.java
M testdata/workloads/functional-planner/queries/PlannerTest/aggregation.test
2 files changed, 23 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/00/4600/2
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Icf3b4511234e473e5b9548fbf3e97f333c9980f1
Gerrit-PatchSet: 2
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Yonghyun Hwang <yonghyun@cloudera.com>

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