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From "godfrey he (JIRA)" <j...@apache.org>
Subject [jira] [Created] (FLINK-6516) using real row count instead of dummy row count when optimizing plan
Date Wed, 10 May 2017 03:10:04 GMT
godfrey he created FLINK-6516:
---------------------------------

             Summary: 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


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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