sunchao opened a new pull request, #4870:
URL: https://github.com/apache/hive/pull/4870
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### What changes were proposed in this pull request?
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Backport a small subset of thrift related changes from HIVE-18755 to
`branch-2.3`, which allows Hive 2.3.x client to specify catalog to read when
communicating with HMS of version 3.x+.
Note this only adds a optional `catalog` field in several of the HMS thrift
APIs, and is backward compatible. I plan to open a few follow-up PRs to
introduce the actual changes to `HiveMetaStoreClient`.
### Why are the changes needed?
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[HIVE-18755](https://issues.apache.org/jira/browse/HIVE-18755) introduced
the concept of catalog which adds another level of namespace on top of tables
and databases. Given HMS using Hive 3.x already has this feature and Hive 2.3
client is commonly used to talk to these metastores through frameworks such as
Spark, this JIRA proposes to backport a subset of the features to allow Hive
2.3 client to specify catalog to read from the 3.x metastores.
### Does this PR introduce _any_ user-facing change?
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No. This is only thrift related changes and is backward compatible.
### Is the change a dependency upgrade?
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No
### How was this patch tested?
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Existing tests
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