Alex Behm has uploaded a new patch set (#6). Change subject: IMPALA-5016: Simplify COALESCE() in SimplifyConditionalsRule. ......................................................................
IMPALA-5016: Simplify COALESCE() in SimplifyConditionalsRule. Simplify COALESCE by skipping leading nulls and applying the following transformations: COALESCE(null, a, b) -> COALESCE(a, b); COALESCE(<literal>, a, b) -> <literal>, when literal is not NullLiteral; COALESCE(<partition-slotref>, a, b) -> <partition-slotref>, when the partition column does not contain NULL. Testing: added unit tests in ExprRewriteRulesTest 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, 126 insertions(+), 17 deletions(-) git pull ssh://gerrit.cloudera.org:29418/Impala-ASF refs/changes/15/7015/6 -- To view, visit http://gerrit.cloudera.org:8080/7015 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-MessageType: newpatchset Gerrit-Change-Id: I0325a9e437261b15313bbdf2f22d83376a84b575 Gerrit-PatchSet: 6 Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-Owner: yu feng <[email protected]> Gerrit-Reviewer: Alex Behm <[email protected]> Gerrit-Reviewer: yu feng <[email protected]>
