c51ab37fad
Lifts `HiveMetastoreCatalog.refreshTable` to `Catalog`. Adds `RefreshTable` command to refresh (possibly cached) metadata in external data sources tables. <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/apache/spark/4624) <!-- Reviewable:end --> Author: Cheng Lian <lian@databricks.com> Closes #4624 from liancheng/refresh-table and squashes the following commits: 8d1aa4c [Cheng Lian] Adds REFRESH TABLE command |
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