hive-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Deepak Jaiswal (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-16132) DataSize stats don't seem correct in semijoin opt branch
Date Tue, 07 Mar 2017 00:59:32 GMT
Deepak Jaiswal created HIVE-16132:
-------------------------------------

             Summary: DataSize stats don't seem correct in semijoin opt branch
                 Key: HIVE-16132
                 URL: https://issues.apache.org/jira/browse/HIVE-16132
             Project: Hive
          Issue Type: Bug
          Components: HiveServer2
            Reporter: Deepak Jaiswal
            Assignee: Deepak Jaiswal


For the following operator tree snippet, the second Select is the start of a semijoin optimization
branch. Take a look at the Data size - it is the same as the data size for its parent Select,
even though the second select has only a single bigint column in its projection (the parent
has 2 columns). I would expect the size to be 533328 (16 bytes * 33333).
Fixing this estimate may become important if we need to estimate the cost of generating the
min/max/bloomfilter.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

Mime
View raw message