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From "Impala Public Jenkins (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4877: fix precedence of unary -/+
Date Wed, 01 Mar 2017 04:18:15 GMT
Impala Public Jenkins has submitted this change and it was merged.

Change subject: IMPALA-4877: fix precedence of unary -/+

IMPALA-4877: fix precedence of unary -/+

Currently, expressions such as "-2 / 3" parse as "-(2 / 3)". In
practice this usually doesn't cause differences for most common
expressions. However, it does interact with a heuristic that changes
decimal expression types to double when one operand is non-decimal
(see JIRA). For example, before this fix,

  typeof(2.0/3.0) = DECIMAL
  typeof(-2.0/3.0) = DOUBLE

because the latter expression parsed as "-1 * (2.0 / 3.0)".
With this fix, both expressions result in a DECIMAL.

Technically this is a compatibility breaking change but it seems
like no one would expect the current behavior so I think we should
fix it. Let me know if you disagree.

Change-Id: I39cf388ae6e37e1b1e12ddea5fd3878c9c2620d1
Reviewed-by: Dan Hecht <>
Tested-by: Impala Public Jenkins
M be/src/exprs/
M fe/src/main/cup/sql-parser.cup
2 files changed, 21 insertions(+), 0 deletions(-)

  Impala Public Jenkins: Verified
  Dan Hecht: Looks good to me, approved

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Gerrit-MessageType: merged
Gerrit-Change-Id: I39cf388ae6e37e1b1e12ddea5fd3878c9c2620d1
Gerrit-PatchSet: 6
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Dan Hecht <>
Gerrit-Reviewer: Dan Hecht <>
Gerrit-Reviewer: Impala Public Jenkins
Gerrit-Reviewer: Marcel Kornacker <>

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