gengliangwang commented on code in PR #50496:
URL: https://github.com/apache/spark/pull/50496#discussion_r2027666279
##########
sql/api/src/main/antlr4/org/apache/spark/sql/catalyst/parser/SqlBaseParser.g4:
##########
@@ -1519,6 +1533,62 @@ number
| MINUS? BIGDECIMAL_LITERAL #bigDecimalLiteral
;
+columnConstraintDefinition
+ : (CONSTRAINT name=errorCapturingIdentifier)? columnConstraint
constraintCharacteristic*
+ ;
+
+columnConstraint
+ : checkConstraint
+ | uniqueSpec
+ | referenceSpec
+ ;
+
+tableConstraintDefinition
+ : (CONSTRAINT name=errorCapturingIdentifier)? tableConstraint
constraintCharacteristic*
+ ;
+
+tableConstraint
+ : checkConstraint
+ | uniqueConstraint
+ | foreignKeyConstraint
+ ;
+
+checkConstraint
+ : CHECK LEFT_PAREN (expr=booleanExpression) RIGHT_PAREN
+ ;
+
+uniqueSpec
+ : UNIQUE
+ | PRIMARY KEY
+ ;
+
+uniqueConstraint
Review Comment:
Either way should work. This is from ANSI SQL sytanx BTW.
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