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From " (JIRA)" <>
Subject [jira] [Commented] (HIVE-2427) Warn user that precision is lost when bigint is implicitly cast to double in joins and unions.
Date Tue, 06 Sep 2011 17:43:17 GMT

] commented on HIVE-2427:

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(Updated 2011-09-06 17:41:24.308161)

Review request for hive and Siying Dong.


Added the new property to hive-default.xml


I added checks before the type conversions for both joins and unions to either throw an error
or a warning depending if a bigint was going to be converted to a double.

I also added a new variable hive.mapred.bigint.comparison.mode, which is set to either strict
or nonstrict to indicate whether an error or a warning should be given when a bigint is converted
to a double.  This is instead of the original implementation which used the variable hive.mapred.mode.

This addresses bug HIVE-2427.

Diffs (updated)

  trunk/ql/src/test/results/clientnegative/compare_string_bigint_union.q.out PRE-CREATION

  trunk/ql/src/test/results/clientpositive/filter_join_breaktask2.q.out 1164293 
  trunk/ql/src/test/results/clientnegative/compare_double_bigint_union.q.out PRE-CREATION

  trunk/ql/src/test/results/clientnegative/compare_string_bigint.q.out 1164293 
  trunk/ql/src/test/results/clientnegative/compare_string_bigint_join.q.out PRE-CREATION 
  trunk/ql/src/test/queries/clientpositive/filter_join_breaktask2.q 1164293 
  trunk/ql/src/test/results/clientnegative/compare_double_bigint.q.out 1164293 
  trunk/ql/src/test/results/clientnegative/compare_double_bigint_join.q.out PRE-CREATION 
  trunk/ql/src/test/queries/clientnegative/compare_double_bigint_union.q PRE-CREATION 
  trunk/ql/src/test/queries/clientnegative/compare_string_bigint.q 1164293 
  trunk/ql/src/test/queries/clientnegative/compare_string_bigint_join.q PRE-CREATION 
  trunk/ql/src/test/queries/clientnegative/compare_string_bigint_union.q PRE-CREATION 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/plan/ 1164293 
  trunk/ql/src/test/queries/clientnegative/compare_double_bigint.q 1164293 
  trunk/ql/src/test/queries/clientnegative/compare_double_bigint_join.q PRE-CREATION 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/ 1164293 
  trunk/ql/src/java/org/apache/hadoop/hive/ql/parse/ 1164293 
  trunk/common/src/java/org/apache/hadoop/hive/conf/ 1164293 
  trunk/conf/hive-default.xml 1164293 



I added several more tests to demonstrate the errors.

I also modified a unit test in which a join was being done which involved a comparison between
a string and a bigint.  I set hive.mapred.bigint.comparison.mode to nonstrict, so the only
change was the new warning appeared in the output.



> Warn user that precision is lost when bigint is implicitly cast to double in joins and
> ----------------------------------------------------------------------------------------------
>                 Key: HIVE-2427
>                 URL:
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Kevin Wilfong
>            Assignee: Kevin Wilfong
>         Attachments: HIVE-2427.1.patch.txt, HIVE-2427.2.patch.txt
> When a bigint is implicitly cast to a double (when a bigint is involved in an equality
expression with a string or double as part of a join condition, or when a bigint column is
to be combined with a string or double column as part of a union) precision may be lost, resulting
in unexpected behavior. Until we fix the underlying issue we should throw an error in strict
mode, and a warning in nonstrict mode alerting the user about this.

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