[jira] [Commented] (SPARK-25701) Supports calculation of table statistics from partition's catalog statistics

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-25701?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16646044#comment-16646044 ] 

Apache Spark commented on SPARK-25701:
--------------------------------------

User 'fjh100456' has created a pull request for this issue:
https://github.com/apache/spark/pull/22693

> Supports calculation of table statistics from partition's catalog statistics
> ----------------------------------------------------------------------------
>
>                 Key: SPARK-25701
>                 URL: https://issues.apache.org/jira/browse/SPARK-25701
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.3.2
>            Reporter: Jinhua Fu
>            Priority: Minor
>
> When obtaining table statistics, if the `totalSize` of the table is not defined, we fallback to HDFS to get the table statistics when `spark.sql.statistics.fallBackToHdfs` is `true`, otherwise the default value(`spark.sql.defaultSizeInBytes`) will be taken.
> Fortunately, in most case the data is written into the table by a insertion command which will save the data-size in meta data, so it's possible to use meta data to calculate the table statistics.



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