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From "Michael Ho (Code Review)" <ger...@cloudera.org>
Subject [Impala-ASF-CR] IMPALA-4813: Round on divide and multiply
Date Tue, 28 Feb 2017 19:22:55 GMT
Michael Ho has posted comments on this change.

Change subject: IMPALA-4813: Round on divide and multiply
......................................................................


Patch Set 5:

(9 comments)

http://gerrit.cloudera.org:8080/#/c/6132/2/be/src/exprs/decimal-operators-ir.cc
File be/src/exprs/decimal-operators-ir.cc:

PS2, Line 729: \
ROUND && ?


http://gerrit.cloudera.org:8080/#/c/6132/5/be/src/runtime/decimal-value.inline.h
File be/src/runtime/decimal-value.inline.h:

PS5, Line 194: namespace detail {
Why new namespace ? To avoid name collision ?


PS5, Line 203: DCHECK(multiplier > 1);
DCHECK(multiplier > 0 && multiplier % 2 == 0);


PS5, Line 205: RESULT_T result = value / multiplier;
Please consider hoisting this out of the loop so we don't need the else statement.


PS5, Line 208: a multiple of two.
Should there be a DCHECK for this ? See comment above.


PS5, Line 249:   // Check overflow again after rounding since +/-1 could cause decimal overflow
             :   if (result_precision == ColumnType::MAX_PRECISION) {
             :     *overflow |= abs(result) > DecimalUtil::MAX_UNSCALED_DECIMAL16;
Should this be inside the if-stmt above ? I don't see any rounding outside of that.


PS5, Line 285:   // Check overflow again after rounding since +/-1 could cause decimal overflow
             :   if (result_precision == ColumnType::MAX_PRECISION) {
             :     *overflow |= abs(result) > DecimalUtil::MAX_UNSCALED_DECIMAL16;
Should this be inside the if-stmt above ? I don't see any rounding outside of that.


PS5, Line 314:  if (round) {
Should we skip this if *overflow is true ?


PS5, Line 316:  free
             :       // free
duplicated "free"


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ie6bfcbe37555b74598d409c6f84f06b0ae5c4312
Gerrit-PatchSet: 5
Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-Owner: Zach Amsden <zamsden@cloudera.com>
Gerrit-Reviewer: Dan Hecht <dhecht@cloudera.com>
Gerrit-Reviewer: Michael Ho
Gerrit-Reviewer: Michael Ho <kwho@cloudera.com>
Gerrit-Reviewer: Zach Amsden <zamsden@cloudera.com>
Gerrit-HasComments: Yes

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