morrySnow commented on code in PR #39997:
URL: https://github.com/apache/doris/pull/39997#discussion_r1734259645
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fe/fe-core/src/main/antlr4/org/apache/doris/nereids/DorisParser.g4:
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@@ -237,7 +237,7 @@ addRollupClause
alterTableClause
: ADD COLUMN columnDef columnPosition? toRollup?
properties=propertyClause? #addColumnClause
- | ADD COLUMN LEFT_PAREN columnDef (COMMA columnDef) RIGHT_PAREN
+ | ADD COLUMN LEFT_PAREN columnDef (COMMA columnDef)? RIGHT_PAREN
Review Comment:
```suggestion
| ADD COLUMN LEFT_PAREN columnDef (COMMA columnDef)* RIGHT_PAREN
```
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