lipzhu opened a new pull request #25082: [SPARK-28310][SQL]Support ansi sql grammar:first_value/last_value(expression, [ignore/respect nulls]) URL: https://github.com/apache/spark/pull/25082 ## What changes were proposed in this pull request? According to the ANSI SLQ 2011  Below are Teradata, Redshift, Oracle which already support this grammar. - Teradata - https://docs.teradata.com/reader/756LNiPSFdY~4JcCCcR5Cw/SUwCpTupqmlBJvi2mipOaA - Oracle - https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/FIRST_VALUE.html#GUID-D454EC3F-370C-4C64-9B11-33FCB10D95EC - Redshift – https://docs.aws.amazon.com/redshift/latest/dg/r_WF_first_value.html ## How was this patch tested? UT.
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