[jira] [Created] (SPARK-22548) Incorrect nested AND expression pushed down to JDBC data source

["Jia Li (JIRA)" <ji...@apache.org>]

Jia Li created SPARK-22548:
------------------------------

             Summary: Incorrect nested AND expression pushed down to JDBC data source
                 Key: SPARK-22548
                 URL: https://issues.apache.org/jira/browse/SPARK-22548
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.2.0
            Reporter: Jia Li


Let’s say I have a JDBC data source table ‘foobar’ with 3 rows:

NAME		THEID
==================
fred            	1
mary          	2
joe 'foo' "bar"    3

This query returns incorrect result. 
SELECT * FROM foobar WHERE (THEID > 0 AND TRIM(NAME) = 'mary') OR (NAME = 'fred')

It’s supposed to return:
fred             	1
mary          	2

But it returns
fred            	1
mary          	2
joe 'foo' "bar"    3

This is because one leg of the nested AND predicate, TRIM(NAME) = 'mary’, can not be pushed down but is lost during JDBC push down filter translation. The same translation method is also called by Data Source V2. I have a fix for this issue and will open a PR. 



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