jlalwani-amazon opened a new pull request, #38:
URL: https://github.com/apache/flink-connector-hive/pull/38

   ## What is the purpose of the change
   
   Replace `GenericUDFNvl` with `GenericUDFCoalesce` in the CASE-to-NVL 
expression folding optimization.
   
   `GenericUDFNvl` was removed in Hive 4 (HIVE-20961). `NVL(a, b)` is 
semantically identical to `COALESCE(a, b)` — both return the first non-null 
argument. `GenericUDFCoalesce` is available in all supported Hive versions 
(2.3+).
   
   *JIRA: [FLINK-29432](https://issues.apache.org/jira/browse/FLINK-29432)*
   
   ## Brief change log
   
   - Replace `GenericUDFNvl` with `GenericUDFCoalesce` in 
`HiveParserTypeCheckProcFactory` (1 file, 3 lines changed)
   
   ## Does this pull request potentially affect one of the following parts?
   
   - Dependencies: **no**
   - The public API: **no**
   - The serializers: **no**
   - The runtime per-record code paths: **no**
   - Anything that affects deployment or recovery: **no**


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