Bikramjeet Vig has posted comments on this change. ( 
http://gerrit.cloudera.org:8080/11854 )

Change subject: IMPALA-7791: Compute AggregationNode's estimated rows using # 
instances
......................................................................


Patch Set 1:

(2 comments)

http://gerrit.cloudera.org:8080/#/c/11854/1//COMMIT_MSG
Commit Message:

http://gerrit.cloudera.org:8080/#/c/11854/1//COMMIT_MSG@13
PS1, Line 13:  to
nit: extra word


http://gerrit.cloudera.org:8080/#/c/11854/1/fe/src/main/java/org/apache/impala/planner/AggregationNode.java
File fe/src/main/java/org/apache/impala/planner/AggregationNode.java:

http://gerrit.cloudera.org:8080/#/c/11854/1/fe/src/main/java/org/apache/impala/planner/AggregationNode.java@474
PS1, Line 474: perInstanceCardinality == -1
does this (getPerInstanceNdv returning -1) mean that we dont have the necessary 
data to cap the estimate based on input cardinality?



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Gerrit-Project: Impala-ASF
Gerrit-Branch: master
Gerrit-MessageType: comment
Gerrit-Change-Id: I2cb9746fafa3e5952e28caa952837e285bcc22ac
Gerrit-Change-Number: 11854
Gerrit-PatchSet: 1
Gerrit-Owner: Pooja Nilangekar <[email protected]>
Gerrit-Reviewer: Bikramjeet Vig <[email protected]>
Gerrit-Reviewer: Impala Public Jenkins <[email protected]>
Gerrit-Reviewer: Pooja Nilangekar <[email protected]>
Gerrit-Reviewer: Tim Armstrong <[email protected]>
Gerrit-Comment-Date: Fri, 02 Nov 2018 00:49:19 +0000
Gerrit-HasComments: Yes

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