[jira] [Comment Edited] (SPARK-19609) Broadcast joins should pushdown join constraints as Filter to the larger relation
[ https://issues.apache.org/jira/browse/SPARK-19609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16156341#comment-16156341 ] ivorzhou edited comment on SPARK-19609 at 9/7/17 2:31 AM: -- It is a very important issue, is there any plan to add this feature? was (Author: ivorzhou): It is very important issue, is there any plan to add this feature? > 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 > > 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 (v6.4.14#64029) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org
[jira] [Commented] (SPARK-19609) Broadcast joins should pushdown join constraints as Filter to the larger relation
[ https://issues.apache.org/jira/browse/SPARK-19609?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel=16156341#comment-16156341 ] ivorzhou commented on SPARK-19609: -- It is very important issue, is there any plan to add this feature? > 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 > > 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 (v6.4.14#64029) - To unsubscribe, e-mail: issues-unsubscr...@spark.apache.org For additional commands, e-mail: issues-h...@spark.apache.org