Indexes' storage descriptors' columns are not deduped, and altering an index
leaves behind an unused storage descriptor
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Key: HIVE-2367
URL: https://issues.apache.org/jira/browse/HIVE-2367
Project: Hive
Issue Type: Bug
Components: Metastore
Reporter: Sohan Jain
The metastore migration by HIVE-2246 does not dedupe the COLUMNS information
for Indexes. That is, the IDXS table has a Storage Descriptor that always
points to a new Column Descriptor, which is unlikely shared by any other
storage descriptor.
Therefore, when altering an index, a new storage Descriptor and column
descriptor are created. No other objects will reference the old storage
descriptor and column descriptor, but they will persist in the metastore db.
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