refactor sql parser

src/main/java/com/alibaba/druid/sql/dialect/postgresql/ast/PGOrderBy.java

@@ -1,50 +0,0 @@
-/*
- * Copyright 1999-2101 Alibaba Group Holding Ltd.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-package com.alibaba.druid.sql.dialect.postgresql.ast;
-
-import com.alibaba.druid.sql.ast.SQLOrderBy;
-import com.alibaba.druid.sql.dialect.postgresql.visitor.PGASTVisitor;
-import com.alibaba.druid.sql.visitor.SQLASTVisitor;
-
-public class PGOrderBy extends SQLOrderBy {
-
-    private boolean sibings;
-
-    public boolean isSibings() {
-        return this.sibings;
-    }
-
-    public void setSibings(boolean sibings) {
-        this.sibings = sibings;
-    }
-
-    protected void accept0(SQLASTVisitor visitor) {
-        if (visitor instanceof PGASTVisitor) {
-            accept0((PGASTVisitor) visitor);
-        } else {
-            super.accept0(visitor);
-        }
-    }
-
-    protected void accept0(PGASTVisitor visitor) {
-        if (visitor.visit(this)) {
-            acceptChild(visitor, this.items);
-        }
-
-        visitor.endVisit(this);
-    }
-
-}

src/main/java/com/alibaba/druid/sql/dialect/postgresql/parser/PGExprParser.java

@@ -25,7 +25,6 @@ import com.alibaba.druid.sql.ast.expr.SQLTimestampExpr;
 import com.alibaba.druid.sql.ast.expr.SQLUnaryExpr;
 import com.alibaba.druid.sql.ast.expr.SQLUnaryOperator;
 import com.alibaba.druid.sql.ast.expr.SQLVariantRefExpr;
-import com.alibaba.druid.sql.dialect.postgresql.ast.PGOrderBy;
 import com.alibaba.druid.sql.dialect.postgresql.ast.expr.PGBoxExpr;
 import com.alibaba.druid.sql.dialect.postgresql.ast.expr.PGCidrExpr;
 import com.alibaba.druid.sql.dialect.postgresql.ast.expr.PGCircleExpr;
@@ -67,32 +66,6 @@ public class PGExprParser extends SQLExprParser {
         return super.parseDataType();
     }
 
-    @Override
-    public PGOrderBy parseOrderBy() {
-        if (lexer.token() == (Token.ORDER)) {
-            PGOrderBy orderBy = new PGOrderBy();
-            lexer.nextToken();
-
-            if (identifierEquals("SIBLINGS")) {
-                lexer.nextToken();
-                orderBy.setSibings(true);
-            }
-
-            accept(Token.BY);
-
-            orderBy.addItem(parseSelectOrderByItem());
-
-            while (lexer.token() == (Token.COMMA)) {
-                lexer.nextToken();
-                orderBy.addItem(parseSelectOrderByItem());
-            }
-
-            return orderBy;
-        }
-
-        return null;
-    }
-    
     public SQLExpr primary() {
         if (lexer.token() == Token.ARRAY) {
             SQLArrayExpr array = new SQLArrayExpr();