[Impala-ASF-CR] IMPALA-5016: Simplify coalesce() in SimplifyConditionalsRule and do static partition pruning with coalesce() function.

[yu feng (Code Review)]

yu feng has restored this change.

Change subject: IMPALA-5016: Simplify coalesce() in SimplifyConditionalsRule 
and do static partition pruning with coalesce() function.
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Gerrit-MessageType: restore
Gerrit-Change-Id: I0b57267ce68ef882d73120b5054603b72867c7f5
Gerrit-PatchSet: 1
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: yu feng <hzfen...@corp.netease.com>