Youwei Wang has posted comments on this change.

Change subject: IMPALA-889: Add support for an ISO-SQL compliant trim() 
function.
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Patch Set 3:

(1 comment)

http://gerrit.cloudera.org:8080/#/c/4474/1//COMMIT_MSG
Commit Message:

Line 10:   Purpose: Removes all instances of one or more characters from the
> Please look at invisible_functions, line 672 of that file.
Greetings, Jim.
Thank you so much for providing this great idea. However, I am afraid I must 
say this approach doesn't work as it is intended to be. If I move the btrim 
entry to the invisible_functions part, both two syntaxes are unavailable now 
for these two syntaxes share the same entry. I have verified this by 
experiments. Please feel free to point out my mistake if you think I am wrong. 
Thank you. :)


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Gerrit-MessageType: comment
Gerrit-Change-Id: I4753c608b0b00569bf8c5e95b132df6df358e602
Gerrit-PatchSet: 3
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Youwei Wang <youwei.a.w...@intel.com>
Gerrit-Reviewer: Jim Apple <jbap...@cloudera.com>
Gerrit-Reviewer: Mostafa Mokhtar <mmokh...@cloudera.com>
Gerrit-Reviewer: Youwei Wang <youwei.a.w...@intel.com>
Gerrit-HasComments: Yes

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