MaxGekk opened a new pull request #32909:
URL: https://github.com/apache/spark/pull/32909


   ### What changes were proposed in this pull request?
   Extend `YearMonthIntervalType` to support interval fields. Valid interval 
field values:
   - 0 (YEAR)
   - 1 (MONTH)
   
   After the changes, the following year-month interval types are supported:
   1. `YearMonthIntervalType(0, 0)` or `YearMonthIntervalType(YEAR, YEAR)`
   2. `YearMonthIntervalType(0, 1)` or `YearMonthIntervalType(YEAR, MONTH)`. 
**It is the default one**.
   3. `YearMonthIntervalType(1, 1)` or `YearMonthIntervalType(MONTH, MONTH)`
   
   ### Why are the changes needed?
   In the current implementation, Spark supports only `interval year to month` 
but the SQL standard allows to specify the start and end fields. The changes 
will allow to follow ANSI SQL standard more precisely.
   
   ### Does this PR introduce _any_ user-facing change?
   Yes but `YearMonthIntervalType` has not been released yet.
   
   ### How was this patch tested?
   By existing test suites.


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