hexianqing 4f1d8d4d39
IMPALA-11536: fix invalid predicates propagate for outer join simplification ...
When set ENABLE_OUTER_JOIN_TO_INNER_TRANSFORMATION = true, the planner
will simplify outer joins if the WHERE clause contains at least one
null rejecting condition and then remove the outer-joined tuple id
from the map of GlobalState#outerJoinedTupleIds.
However, there may be false removals for right join simplification or
full join simplification. This may lead to incorrect results since it
is incorrect to propagate a non null-rejecting predicate into a plan
subtree that is on the nullable side of an outer join.
GlobalState#outerJoinedTupleIds indicates whether a table is on the
nullable side of an outer join.
E.g.
SELECT COUNT(*)
FROM functional.nullrows t1
FULL JOIN functional.nullrows t2 ON t1.id = t2.id
FULL JOIN functional.nullrows t3 ON coalesce(t1.id, t2.id) = t3.id
WHERE t1.group_str = 'a'
AND coalesce(t2.group_str, 'f') = 'f'
The predicate coalesce(t2.group_str, 'f') = 'f' will propagate into t2
if we remove t2 from GlobalState#outerJoinedTupleIds.
Testing:
- Add new plan tests in outer-to-inner-joins.test
- Add new query tests to verify the correctness on transformation
Change-Id: I6565c5bff0d2f24f30118ba47a2583383e83fff7
Reviewed-on: http://gerrit.cloudera.org:8080/19116
Reviewed-by: Qifan Chen <qfchen@hotmail.com >
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com >
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