[ https://issues.apache.org/jira/browse/IMPALA-9358?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Work on IMPALA-9358 started by Kurt Deschler. --------------------------------------------- > Query slowdown with inline views and hundreds of columns > -------------------------------------------------------- > > Key: IMPALA-9358 > URL: https://issues.apache.org/jira/browse/IMPALA-9358 > Project: IMPALA > Issue Type: Bug > Components: Frontend > Affects Versions: Impala 3.2.0 > Reporter: Kurt Deschler > Assignee: Kurt Deschler > Priority: Major > Fix For: Impala 3.4.0 > > > IMPALA-8386 introduced an expensive precondition check using the function > ExprSubstitutionMap.checkComposedFrom(). This check has significant > performance impact on statements that contain inline views with hundreds of > columns. This check needs to be made more efficient to avoid exponential > slowdowns with many columns. -- This message was sent by Atlassian Jira (v8.3.4#803005) --------------------------------------------------------------------- To unsubscribe, e-mail: issues-all-unsubscr...@impala.apache.org For additional commands, e-mail: issues-all-h...@impala.apache.org