Yin Huai created HIVE-4572:
------------------------------
Summary: ColumnPruner cannot preserve RS key columns in
columnExprMap
Key: HIVE-4572
URL: https://issues.apache.org/jira/browse/HIVE-4572
Project: Hive
Issue Type: Bug
Affects Versions: 0.12.0
Reporter: Yin Huai
Assignee: Yin Huai
For a RS of a join operator, if the join key corresponding to this RS does not
appear in the SELECT clause, ColumnPruner will drop the entry of this column in
colExprMap.
Example:
{code}
SELECT x.key FROM src1 x JOIN src y ON (x.key = y.key);
{\code}
Before CP,
{code}
colExprMap of RS corresponding to x: {VALUE._col3=Column[INPUT__FILE__NAME],
VALUE._col2=Column[BLOCK__OFFSET__INSIDE__FILE], VALUE._col1=Column[value],
VALUE._col0=Column[key]};
colExprMap of RS corresponding to y: {VALUE._col3=Column[INPUT__FILE__NAME],
VALUE._col2=Column[BLOCK__OFFSET__INSIDE__FILE], VALUE._col1=Column[value],
VALUE._col0=Column[key]}.
{\code}
After CP,
{code}
colExprMap of RS corresponding to x: {VALUE._col0=Column[key]};
colExprMap of RS corresponding to y: {}.
{\code}
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