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https://issues.apache.org/jira/browse/HIVE-21368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16789239#comment-16789239
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Teddy Choi commented on HIVE-21368:
-----------------------------------
[~gopalv], thanks for pointing out. I made a patch for it.
> Vectorization: Unnecessary Decimal64 -> HiveDecimal conversion
> --------------------------------------------------------------
>
> Key: HIVE-21368
> URL: https://issues.apache.org/jira/browse/HIVE-21368
> Project: Hive
> Issue Type: Bug
> Reporter: Gopal V
> Assignee: Teddy Choi
> Priority: Major
> Attachments: HIVE-21368.1.patch
>
>
> Joins projecting Decimal64 have a suspicious cast in the inner loop
> {code}
> ConvertDecimal64ToDecimal(col 14:decimal(7,2)/DECIMAL_64) -> 24:decimal(7,2)'
> {code}
> {code}
> create temporary table foo(x int , y decimal(7,2));
> create temporary table bar(x int , y decimal(7,2));
> set hive.explain.user=false;
> explain vectorization detail select sum(foo.y) from foo, bar where foo.x =
> bar.x;
> {code}
> {code}
> ' Map Join Operator'
> ' condition map:'
> ' Inner Join 0 to 1'
> ' keys:'
> ' 0 _col0 (type: int)'
> ' 1 _col0 (type: int)'
> ' Map Join Vectorization:'
> ' bigTableKeyColumnNums: [0]'
> ' bigTableRetainedColumnNums: [3]'
> ' bigTableValueColumnNums: [3]'
> ' bigTableValueExpressions:
> ConvertDecimal64ToDecimal(col 1:decimal(7,2)/DECIMAL_64) -> 3:decimal(7,2)'
> ' className: VectorMapJoinInnerBigOnlyLongOperator'
> ' native: true'
> ' nativeConditionsMet:
> hive.mapjoin.optimized.hashtable IS true,
> hive.vectorized.execution.mapjoin.native.enabled IS true,
> hive.execution.engine tez IN [tez, spark] IS true, One MapJoin Condition IS
> true, No nullsafe IS true, Small table vectorizes IS true, Fast Hash Table
> and No Hybrid Hash Join IS true'
> ' projectedOutputColumnNums: [3]'
> {code}
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