cloud-fan commented on code in PR #37407:
URL: https://github.com/apache/spark/pull/37407#discussion_r959700764
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sql/catalyst/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
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@@ -618,6 +618,46 @@ pivotValue
: expression (AS? identifier)?
;
+unpivotClause
+ : UNPIVOT nullOperator=unpivotNullClause? LEFT_PAREN
+ operator=unpivotOperator
+ RIGHT_PAREN (AS? identifier)?
+ ;
+
+unpivotNullClause
+ : (INCLUDE | EXCLUDE) NULLS
+ ;
+
+unpivotOperator
+ : (unpivotSingleValueColumnClause | unpivotMultiValueColumnClause)
+ ;
+
+unpivotSingleValueColumnClause
+ : unpivotValueColumn FOR unpivotNameColumn IN LEFT_PAREN
unpivotColumns+=unpivotColumn (COMMA unpivotColumns+=unpivotColumn)* RIGHT_PAREN
+ ;
+
+unpivotMultiValueColumnClause
+ : LEFT_PAREN unpivotValueColumns+=unpivotValueColumn (COMMA
unpivotValueColumns+=unpivotValueColumn)* RIGHT_PAREN
+ FOR unpivotNameColumn
+ IN LEFT_PAREN unpivotColumnSets+=unpivotColumnSet (COMMA
unpivotColumnSets+=unpivotColumnSet)* RIGHT_PAREN
+ ;
+
+unpivotColumnSet
+ : LEFT_PAREN unpivotColumns+=unpivotColumn (COMMA
unpivotColumns+=unpivotColumn)* RIGHT_PAREN (AS? identifier)?
Review Comment:
do we allow `IN ((col1 AS a, col2 AS b) AS c)`?
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