Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/21479#discussion_r192516776
--- Diff:
sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBase.g4 ---
@@ -592,6 +592,7 @@ primaryExpression
| identifier
#columnReference
| base=primaryExpression '.' fieldName=identifier
#dereference
| '(' expression ')'
#parenthesizedExpression
+ | EXTRACT '(' field=(YEAR | QUARTER | MONTH | WEEK | DAY | HOUR |
MINUTE | SECOND) FROM source=valueExpression ')' #extract
--- End diff --
How about `EXTRACT '(' field=identifier FROM source=valueExpression ')'`
instead of introducing each term?
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