[ https://issues.apache.org/jira/browse/SPARK-19609?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Hyukjin Kwon resolved SPARK-19609. ---------------------------------- Resolution: Incomplete > Broadcast joins should pushdown join constraints as Filter to the larger > relation > --------------------------------------------------------------------------------- > > Key: SPARK-19609 > URL: https://issues.apache.org/jira/browse/SPARK-19609 > Project: Spark > Issue Type: Improvement > Components: SQL > Affects Versions: 2.1.0 > Reporter: Nick Dimiduk > Priority: Major > Labels: bulk-closed > > For broadcast inner-joins, where the smaller relation is known to be small > enough to materialize on a worker, the set of values for all join columns is > known and fits in memory. Spark should translate these values into a > {{Filter}} pushed down to the datasource. The common join condition of > equality, i.e. {{lhs.a == rhs.a}}, can be written as an {{a in ...}} clause. > An example of pushing such filters is already present in the form of > {{IsNotNull}} filters via [~sameerag]'s work on SPARK-12957 subtasks. > This optimization could even work when the smaller relation does not fit > entirely in memory. This could be done by partitioning the smaller relation > into N pieces, applying this predicate pushdown for each piece, and unioning > the results. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org