Zhenhua Wang created SPARK-18911:
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Summary: Decouple Statistics and CatalogTable
Key: SPARK-18911
URL: https://issues.apache.org/jira/browse/SPARK-18911
Project: Spark
Issue Type: Sub-task
Components: SQL
Reporter: Zhenhua Wang
Statistics in LogicalPlan should use attributes to refer to columns rather than
column names, because two columns from two relations can have the same column
name. But CatalogTable doesn't have the concepts of attribute or broadcast hint
in Statistics. Therefore, putting Statistics in CatalogTable is confusing. We
need to define a different statistic structure in CatalogTable, which is only
responsible for interacting with metastore, and is converted to statistics in
LogicalPlan when it is used.
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