Kurt Deschler has posted comments on this change. ( http://gerrit.cloudera.org:8080/19682 )
Change subject: IMPALA-12006: Improve cardinality estimation for joins involving multiple conjuncts ...................................................................... Patch Set 1: (1 comment) http://gerrit.cloudera.org:8080/#/c/19682/1/fe/src/main/java/org/apache/impala/planner/JoinNode.java File fe/src/main/java/org/apache/impala/planner/JoinNode.java: http://gerrit.cloudera.org:8080/#/c/19682/1/fe/src/main/java/org/apache/impala/planner/JoinNode.java@421 PS1, Line 421: if (analyzer.getQueryOptions().isUse_multiplied_selectivity_for_join()) { > Thanks for the suggestion. So conceptually a coefficient which is less tha Correct, the result will be somewhere between the multiplied selectivity and min selectivity depending on the coefficient value. The 0 value would need special handling to avoid DIV0 so the disable case should be straightforward. -- To view, visit http://gerrit.cloudera.org:8080/19682 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: I845d778a58404af834f7501fc8157a5a4b4bcc35 Gerrit-Change-Number: 19682 Gerrit-PatchSet: 1 Gerrit-Owner: Aman Sinha <[email protected]> Gerrit-Reviewer: Aman Sinha <[email protected]> Gerrit-Reviewer: Csaba Ringhofer <[email protected]> Gerrit-Reviewer: Impala Public Jenkins <[email protected]> Gerrit-Reviewer: Kurt Deschler <[email protected]> Gerrit-Reviewer: Quanlong Huang <[email protected]> Gerrit-Comment-Date: Thu, 06 Apr 2023 19:48:33 +0000 Gerrit-HasComments: Yes
