Gengliang Wang created SPARK-31919:
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Summary: Push down more predicates through Join
Key: SPARK-31919
URL: https://issues.apache.org/jira/browse/SPARK-31919
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.1.0
Reporter: Gengliang Wang
Assignee: Gengliang Wang
Currently, in `PushPredicateThroughJoin`, if the condition predicate of `Or`
operator can't be entirely pushed down, it will be thrown away.
In fact, the predicates under `Or` operators can be partially pushed down.
For example, says `a` and `b` are able to be pushed into one of the joined
tables, while `c` can't be pushed down, the predicate
`a or (b and c)`
can be converted as
`(a or b) and (a or c)`
We can still push down `(a or b)`.
We can't push down disjunctive predicates only when one of its children is not
partially convertible.
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