HIVE-28908: From clause supports catalog.db.tbl pattern #5774
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Currently, this PR only focus on from clause against the HMS native catalog, and does not involve other external catalogs such as JDBC catalog or Iceberg REST catalog.
We can have some discussions based on this PR and formulate a complete solution for Hive's multi-catalog functionality
For example, we can query a iceberg table by the catalog.db.tbl pattern:
For the iceberg metadata table, we can use the catalog.db.tbl.meta pattern
select * from hive.testicedb.testice.history;
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Why are the changes needed?
Does this PR introduce any user-facing change?
How was this patch tested?