beliefer opened a new pull request #27440: [SPARK-27951][SQL] Support ANSI SQL NTH_VALUE window function URL: https://github.com/apache/spark/pull/27440 ### What changes were proposed in this pull request? The `NTH_VALUE` function is an ANSI SQL. There are some mainstream database support the syntax. **PostgreSQL:** https://www.postgresql.org/docs/8.4/functions-window.html **Vertica:** https://www.vertica.com/docs/9.2.x/HTML/Content/Authoring/SQLReferenceManual/Functions/Analytic/NTH_VALUEAnalytic.htm?tocpath=SQL%20Reference%20Manual%7CSQL%20Functions%7CAnalytic%20Functions%7C_____23 **Oracle:** https://docs.oracle.com/en/database/oracle/oracle-database/19/sqlrf/NTH_VALUE.html#GUID-F8A0E88C-67E5-4AA6-9515-95D03A7F9EA0 ### Why are the changes needed? The `NTH_VALUE` function is an ANSI SQL. The `NTH_VALUE` function is very useful. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Exists and new UT.
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