Qifan Chen has posted comments on this change. ( http://gerrit.cloudera.org:8080/17637 )
Change subject: IMPALA-10766: Better selectivity for =,not distinct ...................................................................... Patch Set 7: Code-Review+2 (1 comment) http://gerrit.cloudera.org:8080/#/c/17637/6/fe/src/main/java/org/apache/impala/analysis/BinaryPredicate.java File fe/src/main/java/org/apache/impala/analysis/BinaryPredicate.java: http://gerrit.cloudera.org:8080/#/c/17637/6/fe/src/main/java/org/apache/impala/analysis/BinaryPredicate.java@288 PS6, Line 288: selectivity_ = selectivity_ * (double) (numRows - numNulls) / numRows + : numNulls / numRows; > This calculation formula may be (1- 1/ndv)* (numRows - numNulls) / numRows Done -- To view, visit http://gerrit.cloudera.org:8080/17637 To unsubscribe, visit http://gerrit.cloudera.org:8080/settings Gerrit-Project: Impala-ASF Gerrit-Branch: master Gerrit-MessageType: comment Gerrit-Change-Id: Ib8ec62f2355a7036125cc0d261b790644b9f4b60 Gerrit-Change-Number: 17637 Gerrit-PatchSet: 7 Gerrit-Owner: liuyao <[email protected]> Gerrit-Reviewer: Aman Sinha <[email protected]> Gerrit-Reviewer: Impala Public Jenkins <[email protected]> Gerrit-Reviewer: Qifan Chen <[email protected]> Gerrit-Reviewer: Zoltan Borok-Nagy <[email protected]> Gerrit-Reviewer: liuyao <[email protected]> Gerrit-Comment-Date: Tue, 13 Jul 2021 13:26:51 +0000 Gerrit-HasComments: Yes
