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https://issues.apache.org/jira/browse/FLINK-6516?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16003965#comment-16003965
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ASF GitHub Bot commented on FLINK-6516:
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GitHub user godfreyhe opened a pull request:
https://github.com/apache/flink/pull/3860
[FLINK-6516] [table] using real row count instead of dummy row count when
optimizing plan
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/godfreyhe/flink FLINK-6516
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/flink/pull/3860.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #3860
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commit 4914c1858aecbb57c86ea474a551f41eaab13b34
Author: godfreyhe <[email protected]>
Date: 2017-05-10T03:14:06Z
[FLINK-6516] [table] using real row count instead of dummy row count when
optimizing plan
----
> using real row count instead of dummy row count when optimizing plan
> --------------------------------------------------------------------
>
> Key: FLINK-6516
> URL: https://issues.apache.org/jira/browse/FLINK-6516
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: godfrey he
> Assignee: godfrey he
>
> Currently, the statistic of {{TableSourceTable}} is {{UNKNOWN}} mostly, and
> the statistic from {{ExternalCatalog}} maybe is null also. Actually, only
> each {{TableSource}} knows its statistic exactly, especial for
> {{FilterableTableSource}} and {{PartitionableTableSource}}. So we can add
> {{getTableStats}} method in {{TableSource}}, and use it in TableSourceScan's
> estimateRowCount method to get real row count.
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