[ https://issues.apache.org/jira/browse/IMPALA-661?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Tim Armstrong resolved IMPALA-661. ---------------------------------- Resolution: Later Closing some JIRAs that have useful suggestions but limited interest. We can reopen if there is more interest. > Explain plan should characterize the cost of evaluating predicates > ------------------------------------------------------------------ > > Key: IMPALA-661 > URL: https://issues.apache.org/jira/browse/IMPALA-661 > Project: IMPALA > Issue Type: New Feature > Components: Frontend > Affects Versions: Impala 1.1.1, Impala 2.5.0 > Reporter: Alan Choi > Priority: Minor > > Explain plan is an effective tool for tuning query. However, it doesn't give > much inside into the (cpu) cost of expression evaluation. For complex > predicates, it'll greatly affect the runtime of the query. For example, > complex regex is very costly to evaluate. > Right now, if a complex join predicate cause the join to slow down, it's not > very easy to tell. > If explain plan can annotate the cost of predicate evaluation (roughly), then > it can guide our user to identify and tune the predicates. -- This message was sent by Atlassian Jira (v8.3.2#803003)