beliefer opened a new pull request #27442: [SPARK-30708][SQL] Fix parse exception for first_value and last_value URL: https://github.com/apache/spark/pull/27442 ### What changes were proposed in this pull request? When I running first_value and last_value window function occur a `ParserException`. Take first_value as an example, the `ParserException` show below. ``` SELECT first_value(unique1) over w, last_value(unique1) over w FROM tenk1 WHERE unique1 < 10 WINDOW w AS (order by four range between current row and unbounded following) org.apache.spark.sql.catalyst.parser.ParseException no viable alternative at input 'first_value'(line 1, pos 7) == SQL == SELECT first_value(unique1) over w, -------^^^ last_value(unique1) over w FROM tenk1 WHERE unique1 < 10 WINDOW w AS (order by four range between current row and unbounded following) ``` After my investigation, I found that `FIRST`, `FIRST_VALUE`, `LAST`, `LAST_VALUE` are all ansi reserved words. But both `FIRST` and `LAST` are now on the `ansiNonReserved` list, so I put `FIRST_VALUE` and `LAST_VALUE` on the `ansiNonReserved` list too. ### Why are the changes needed? Fix bug. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Exists UT
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