Taras Bobrovytsky has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/9339 )

Change subject: IMPALA-6405: Error when string to decimal cast overflows
......................................................................


Patch Set 2:

(2 comments)

http://gerrit.cloudera.org:8080/#/c/9339/2/be/src/exprs/decimal-operators-ir.cc
File be/src/exprs/decimal-operators-ir.cc:

http://gerrit.cloudera.org:8080/#/c/9339/2/be/src/exprs/decimal-operators-ir.cc@584
PS2, Line 584:     ctx->AddWarning("String to Decimal cast underflowed");
> I guess this case can only happen with DECIMAL_V2=false?  Because of:
No, this does not happen only when decimal_v2 is false. (Take a look at the 
tests that I added).

I don't think this would bee too loud and occur too frequently. I doubt that 
there are many cases where a user wants to convert a string with more digits 
after the dot than the scale of the decimal. My guess is in most cases when 
this warning happens, it means something went wrong, so issuing a warning is ok.


http://gerrit.cloudera.org:8080/#/c/9339/2/testdata/workloads/functional-query/queries/QueryTest/decimal-exprs.test
File testdata/workloads/functional-query/queries/QueryTest/decimal-exprs.test:

http://gerrit.cloudera.org:8080/#/c/9339/2/testdata/workloads/functional-query/queries/QueryTest/decimal-exprs.test@459
PS2, Line 459: decimal_v2=0;
> nit: existing cases use decimal_v2=false/true. Would be good to be consiste
Done



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: Icffccac1c1c2361447ae4b0de9b6c2ec7de071db
Gerrit-Change-Number: 9339
Gerrit-PatchSet: 2
Gerrit-Owner: Taras Bobrovytsky <tbobrovyt...@cloudera.com>
Gerrit-Reviewer: Alex Behm <alex.b...@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhe...@cloudera.com>
Gerrit-Reviewer: Taras Bobrovytsky <tbobrovyt...@cloudera.com>
Gerrit-Reviewer: Zach Amsden <zams...@cloudera.com>
Gerrit-Comment-Date: Mon, 05 Mar 2018 22:57:54 +0000
Gerrit-HasComments: Yes

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