remove unused code

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

@@ -50,19 +50,4 @@ public class PGOrderBy extends SQLOrderBy {
         visitor.endVisit(this);
     }
 
-    public void output(StringBuffer buf) {
-        buf.append("ORDER ");
-        if (this.sibings) {
-            buf.append("SIBLINGS ");
-        }
-        buf.append("BY ");
-
-        int i = 0;
-        for (int size = this.items.size(); i < size; ++i) {
-            if (i != 0) {
-                buf.append(", ");
-            }
-            ((PGOrderByItem) this.items.get(i)).output(buf);
-        }
-    }
 }

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

@@ -1,87 +0,0 @@
-/*
- * Copyright 1999-2011 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.SQLOrderingSpecification;
-import com.alibaba.druid.sql.ast.statement.SQLSelectOrderByItem;
-import com.alibaba.druid.sql.dialect.postgresql.visitor.PGASTVisitor;
-import com.alibaba.druid.sql.visitor.SQLASTVisitor;
-
-public class PGOrderByItem extends SQLSelectOrderByItem {
-
-    private static final long serialVersionUID = 1L;
-
-    private NullsOrderType    nullsOrderType;
-
-    public PGOrderByItem(){
-
-    }
-
-    public NullsOrderType getNullsOrderType() {
-        return this.nullsOrderType;
-    }
-
-    public void setNullsOrderType(NullsOrderType nullsOrderType) {
-        this.nullsOrderType = nullsOrderType;
-    }
-
-    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.expr);
-        }
-
-        visitor.endVisit(this);
-    }
-
-    public void output(StringBuffer buf) {
-        this.expr.output(buf);
-        if (SQLOrderingSpecification.ASC.equals(this.type)) {
-            buf.append(" ASC");
-        } else if (SQLOrderingSpecification.DESC.equals(this.type)) {
-            buf.append(" DESC");
-        }
-        if (NullsOrderType.NullsFirst.equals(this.nullsOrderType)) {
-            buf.append(" NULLS FIRST");
-        } else if (NullsOrderType.NullsLast.equals(this.nullsOrderType)) {
-            buf.append(" NULLS LAST");
-        }
-    }
-
-    public static enum NullsOrderType {
-        NullsFirst, NullsLast;
-
-        public String toFormalString() {
-            if (NullsFirst.equals(this)) {
-                return "NULLS FIRST";
-            }
-
-            if (NullsLast.equals(this)) {
-                return "NULLS LAST";
-            }
-
-            throw new IllegalArgumentException();
-        }
-    }
-
-}