[ https://issues.apache.org/jira/browse/SPARK-21520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
caoxuewen updated SPARK-21520: ------------------------------ Summary: Improvement a special case for non-deterministic projects in optimizer (was: Improvement a special case for non-deterministic projects and filters in optimizer) > Improvement a special case for non-deterministic projects in optimizer > ---------------------------------------------------------------------- > > Key: SPARK-21520 > URL: https://issues.apache.org/jira/browse/SPARK-21520 > Project: Spark > Issue Type: Improvement > Components: SQL > Affects Versions: 2.3.0 > Reporter: caoxuewen > > Currently, Did a lot of special handling for non-deterministic projects and > filters in optimizer. but not good enough. this patch add a new special case > for non-deterministic projects and filters. Deal with that we only need to > read user needs fields for non-deterministic projects and filters in > optimizer. > For example, the fields of project contains nondeterministic function(rand > function), after a executedPlan optimizer generated: > *HashAggregate(keys=[k#403L], functions=[partial_sum(cast(id#402 as > bigint))], output=[k#403L, sum#800L]) > +- Project [d004#607 AS id#402, FLOOR((rand(8828525941469309371) * 10000.0)) > AS k#403L] > +- HiveTableScan [c030#606L, d004#607, d005#608, d025#609, c002#610, > d023#611, d024#612, c005#613L, c008#614, c009#615, c010#616, d021#617, > d022#618, c017#619, c018#620, c019#621, c020#622, c021#623, c022#624, > c023#625, c024#626, c025#627, c026#628, c027#629, ... 169 more fields], > MetastoreRelation XXX_database, XXX_table > HiveTableScan will read all the fields from table. but we only need to ‘d004’ > . it will affect the performance of task. -- 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