refactor: 移除antlr4减小包体积&ai助手优化

server/internal/db/dbm/sqlparser/sqlstmt/ddl.go

@@ -1,53 +1,9 @@
 package sqlstmt
 
-type (
-	IDdlStmt interface {
-		isDdl()
-	}
-
-	DdlStmt struct {
-		*Node
-	}
-
-	CreateDatabase struct {
-		DdlStmt
-	}
-
-	CreateTable struct {
-		DdlStmt
-	}
-
-	CreateIndex struct {
-		DdlStmt
-	}
-
-	AlterTable struct {
-		DdlStmt
-	}
-
-	AlterDatabase struct {
-		DdlStmt
-	}
-
-	DropDatabase struct {
-		DdlStmt
-	}
-
-	DropIndex struct {
-		DdlStmt
-	}
-
-	DropTable struct {
-		DdlStmt
-	}
-
-	DropView struct {
-		DdlStmt
-	}
-)
-
-func (d *DdlStmt) isDdl() {}
-
-func IsDDL(node INode) bool {
-	return true
+// DdlStmt DDL 语句
+type DdlStmt struct {
+	Base
+	DdlKind string // CREATE_TABLE, DROP_TABLE, ALTER_TABLE 等
 }
+
+func (*DdlStmt) StmtKind() Kind { return KindDdl }