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From "Dimitris Tsirogiannis (Code Review)" <>
Subject [Impala-ASF-CR] IMPALA-4309: Introduce Expr rewrite phase and supporting classes.
Date Fri, 21 Oct 2016 22:03:32 GMT
Dimitris Tsirogiannis has posted comments on this change.

Change subject: IMPALA-4309: Introduce Expr rewrite phase and supporting classes.

Patch Set 4:

File fe/src/main/java/org/apache/impala/analysis/

PS4, Line 378: rewriter_.reset();
             :         analysisResult_.stmt_.rewriteExprs(rewriter_);
             :         reAnalyze = rewriter_.changed();
> Don't really agree.
I understand what you're saying. However, as is now, you have a class that keeps track of
modifications to other classes it acts upon. So now you have to make sure that you reset the
state of the rewriter before you apply it to a different entity. Re #2, I believe there is
a way to have each class track modifications to its own state but it will probably require
some kind of visitor pattern. Let me think about it and maybe I can suggest something more
File fe/src/main/java/org/apache/impala/analysis/

PS4, Line 60: rewrite
> Sorry, missed this.
ha, correct. I was thinking of the action. But rewriter is not ambiguous :)

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Gerrit-MessageType: comment
Gerrit-Change-Id: I2279dc984bcf7742db4fa3b1aa67283ecbb05e6e
Gerrit-PatchSet: 4
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Alex Behm <>
Gerrit-Reviewer: Alex Behm <>
Gerrit-Reviewer: Bharath Vissapragada <>
Gerrit-Reviewer: Dimitris Tsirogiannis <>
Gerrit-Reviewer: Tim Armstrong <>
Gerrit-HasComments: Yes

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