Gopal V created HIVE-21368:
------------------------------
Summary: 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
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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