Add COLLATE clause parsing for column definitions

- Add COLLATE handling in parseColumnDefinition
- Add Collation field output in columnDefinitionToJSON

Author: claude

parser/marshal.go

@@ -3306,6 +3306,9 @@ func (p *Parser) parseColumnDefinition() (*ast.ColumnDefinition, error) {
 			}
 			// Continue to parse actual constraint in next iteration
 			continue
+		} else if upperLit == "COLLATE" {
+			p.nextToken() // consume COLLATE
+			col.Collation = p.parseIdentifier()
 		} else {
 			break
 		}
@@ -4416,6 +4419,9 @@ func columnDefinitionToJSON(c *ast.ColumnDefinition) jsonNode {
 	if c.DataType != nil {
 		node["DataType"] = dataTypeReferenceToJSON(c.DataType)
 	}
+	if c.Collation != nil {
+		node["Collation"] = identifierToJSON(c.Collation)
+	}
 	return node
 }
 

parser/testdata/TSqlParserTestScript1/metadata.json

@@ -1 +1 @@
-{"todo": true}
+{}