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Posted to issues@spark.apache.org by "Victor May (JIRA)" <ji...@apache.org> on 2015/10/01 16:32:26 UTC

[jira] [Created] (SPARK-10899) Support JDBC pushdown for additional commands

Victor May created SPARK-10899:
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             Summary: Support JDBC pushdown for additional commands
                 Key: SPARK-10899
                 URL: https://issues.apache.org/jira/browse/SPARK-10899
             Project: Spark
          Issue Type: New Feature
          Components: SQL
    Affects Versions: 1.5.0
            Reporter: Victor May
            Priority: Minor


Spark DataFrames currently support predicate push-down with JDBC sources but term predicate is used in a strict SQL meaning. It means it covers only WHERE clause. Moreover it looks like it is limited to the logical conjunction (no IN and OR I am afraid) and simple predicates.

This creates a situation where a simple query such as "select * from table limit 100" could easily result in the database being overloaded when the table is large.

This feature request is to expand  the support for push-downs to additional SQL commands:
-LIMIT
-WHERE IN
-WHERE NOT IN
-GROUP BY




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