[SPARK-15916][SQL] JDBC filter push down should respect operator precedence #13743
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What changes were proposed in this pull request?
This PR fixes the problem that the precedence order is messed when pushing where-clause expression to JDBC layer.
Case 1:
For sql
select * from table where (a or b) and c
, the where-clause is wrongly converted to JDBC where-clausea or (b and c)
after filter push down. The consequence is that JDBC may returns less or more rows than expected.Case 2:
For sql
select * from table where always_false_condition
, the result table may not be empty if the JDBC RDD is partitioned using where-clause:How was this patch tested?
Unit test.
This PR also close #13640