[Impala-ASF-CR] IMPALA-1861: Simplify conditionals with constant conditions

["Thomas Tauber-Marshall (Code Review)" <ge...@cloudera.org>]

Thomas Tauber-Marshall has uploaded a new patch set (#3).

Change subject: IMPALA-1861: Simplify conditionals with constant conditions
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IMPALA-1861: Simplify conditionals with constant conditions

When there are conditionals with constant values of TRUE or
FALSE we can simplify them during analysis using the ExprRewriter.

This patch introduces the SimplifyConditionalsRule with covers IF,
OR, AND, CASE, and DECODE.

It also introduces NormalizeExprsRule which normalizes AND and OR
such that if either child is a literal, then the left child is a
literal.

Testing:
- Added unit tests to ExprRewriteRulesTest.
- Ran FE planner tests and BE expr-test.

Change-Id: Id70aaf9fd99f64bd98175b7e2dbba28f350e7d3b
---
M fe/src/main/java/org/apache/impala/analysis/AnalysisContext.java
M fe/src/main/java/org/apache/impala/analysis/CaseWhenClause.java
A fe/src/main/java/org/apache/impala/rewrite/NormalizeExprsRule.java
A fe/src/main/java/org/apache/impala/rewrite/SimplifyConditionalsRule.java
M fe/src/test/java/org/apache/impala/analysis/ExprRewriteRulesTest.java
5 files changed, 312 insertions(+), 12 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/85/5585/3
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: Id70aaf9fd99f64bd98175b7e2dbba28f350e7d3b
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Thomas Tauber-Marshall <tm...@cloudera.com>
Gerrit-Reviewer: Alex Behm <al...@cloudera.com>