Jinhua Fu created SPARK-25701:
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Summary: 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
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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