yu feng has uploaded a new patch set (#3).

Change subject: IMPALA-5016: Try to rewrite coalesce() function in 
SimplifyConditionalsRule.
......................................................................

IMPALA-5016: Try to rewrite coalesce() function in SimplifyConditionalsRule.

try to rewrite coalesce() function with head-most nulls, constant values
and HDFS table partition metadatas. which will make sence in partiton purning

Testing:
add some unit tests for SimplifyConditionalsRule with coalesce() function.
run all test cases in SimplifyConditionalsRule and all passed.

Change-Id: I0325a9e437261b15313bbdf2f22d83376a84b575
---
M fe/src/main/java/org/apache/impala/rewrite/SimplifyConditionalsRule.java
M fe/src/test/java/org/apache/impala/analysis/ExprRewriteRulesTest.java
2 files changed, 121 insertions(+), 17 deletions(-)


  git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/15/7015/3
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I0325a9e437261b15313bbdf2f22d83376a84b575
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: yu feng <hzfen...@corp.netease.com>
Gerrit-Reviewer: Alex Behm <alex.b...@cloudera.com>

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