HIVE-29452: Split get table from HMSHandler

[dengzhhu653]

What changes were proposed in this pull request?

Why are the changes needed?

Does this PR introduce any user-facing change?

How was this patch tested?

[Copilot]

Pull request overview

This PR refactors Hive Metastore “get table”-related logic by moving several table retrieval/listing flows out of HMSHandler into a dedicated GetTableHandler request handler, aligning with the existing request-handler architecture used elsewhere in the standalone metastore server.

Changes:

• Introduces GetTableHandler to centralize implementations for get_table_req, get_table_core, get_table_objects_by_name_req, and various table-name listing methods.
• Updates HMSHandler to delegate these operations to GetTableHandler and removes now-duplicated helper logic.
• Improves an UnsupportedOperationException message in GetPartitionsHandler to include the unsupported request object.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HMSHandler.java	Delegates multiple table APIs to the new GetTableHandler and removes inlined implementations.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/handler/GetTableHandler.java	New request handler consolidating table fetch/list logic previously in HMSHandler.
standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/handler/GetPartitionsHandler.java	Makes the “not yet implemented” exception include the request value for easier debugging.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

Comments suppressed due to low confidence (1)

standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/HMSHandler.java:1449

• In get_table_req, exceptions from GetTableHandler.getTable(...) aren't captured/passed to endFunction (the Exception argument is always null). This can hide failures from end-function listeners/metrics and produces misleading audit/telemetry. Capture the exception in a local Exception ex (as other HMSHandler methods do), rethrow it, and pass ex to endFunction.

  @Override
  public List<TableMeta> get_table_meta(String dbnames, String tblNames, List<String> tblTypes)
      throws MetaException, NoSuchObjectException {
    List<TableMeta> t = null;
    String[] parsedDbName = parseDbName(dbnames, conf);
    startTableFunction("get_table_metas", parsedDbName[CAT_NAME], parsedDbName[DB_NAME], tblNames);
    Exception ex = null;

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[wecharyu]

Looks good overall, just left a few minor comments.

[wecharyu]

nit: get_table_metas => get_table_meta

[dengzhhu653]

metastore metrics will use this field, changing it to a new one might break the old graph we built for this method

[wecharyu]

nit: get_multi_table => get_table_objects

[wecharyu]

It does not filter out the result by possible filter or pattern.

[dengzhhu653]

good catch, we ignore the filter/pattern for remote database before the change, maybe we need to address it in the future.
added the missing authorization filter.

[sonarqubecloud]

Quality Gate passed

Issues
29 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
1.2% Duplication on New Code

See analysis details on SonarQube Cloud

[wecharyu]

LGTM

[dengzhhu653]

Thank you for the review @wecharyu!