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SQL Parser and Optimizer

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to you 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.hazelcast.org.apache.calcite.sql.fun;

import com.hazelcast.org.apache.calcite.sql.SqlCall;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.SqlNode;
import com.hazelcast.org.apache.calcite.sql.SqlPrefixOperator;
import com.hazelcast.org.apache.calcite.sql.validate.SqlValidator;

/**
 * SqlNewOperator represents an SQL new specification such as
 * NEW UDT(1, 2). When used in an SqlCall, SqlNewOperator takes a
 * single operand, which is an invocation of the constructor method; but when
 * used in a RexCall, the operands are the initial values to be used for the new
 * instance.
 */
public class SqlNewOperator extends SqlPrefixOperator {
  //~ Constructors -----------------------------------------------------------

  public SqlNewOperator() {
    super("NEW", SqlKind.NEW_SPECIFICATION, 0, null, null, null);
  }

  //~ Methods ----------------------------------------------------------------

  // override SqlOperator
  @Override public SqlNode rewriteCall(SqlValidator validator, SqlCall call) {
    // New specification is purely syntactic, so we rewrite it as a
    // direct call to the constructor method.
    return call.operand(0);
  }

  // override SqlOperator
  @Override public boolean requiresDecimalExpansion() {
    return false;
  }
}