content: /*
   * 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 org.apache.calcite.sql.fun;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlBinaryOperator;
  import org.apache.calcite.sql.SqlCallBinding;
  import org.apache.calcite.sql.SqlKind;
  import org.apache.calcite.sql.SqlOperandCountRange;
  import org.apache.calcite.sql.SqlOperatorBinding;
  import org.apache.calcite.sql.type.InferTypes;
  import org.apache.calcite.sql.validate.SqlMonotonicity;
  
  /**
   * Infix cast operator, "::", as used in PostgreSQL.
   *
   * <p>This operator is not enabled in the default operator table; it is
   * registered for various dialects via {@link SqlLibraryOperators#INFIX_CAST}.
   *
   * <p>The {@link #kind} is {@link SqlKind#CAST}, the same as the built-in
   * {@code CAST} function, {@link SqlCastFunction}. Be sure to use {@code kind}
   * rather than {@code instanceof} if you would like your code to apply to both
   * operators.
   *
   * <p>Unlike {@code SqlCastFunction}, it can only be used for
   * {@link org.apache.calcite.sql.SqlCall SqlCall};
   * {@link org.apache.calcite.rex.RexCall RexCall} must use
   * {@code SqlCastFunction}.
   */
  class SqlCastOperator extends SqlBinaryOperator {
    SqlCastOperator() {
      super("::", SqlKind.CAST, 94, true, null, InferTypes.FIRST_KNOWN, null);
    }
  
    @Override public RelDataType inferReturnType(
        SqlOperatorBinding opBinding) {
      return SqlStdOperatorTable.CAST.inferReturnType(opBinding);
    }
  
    @Override public boolean checkOperandTypes(SqlCallBinding callBinding,
        boolean throwOnFailure) {
      return SqlStdOperatorTable.CAST.checkOperandTypes(callBinding,
          throwOnFailure);
    }
  
    @Override public SqlOperandCountRange getOperandCountRange() {
      return SqlStdOperatorTable.CAST.getOperandCountRange();
    }
  
    @Override public SqlMonotonicity getMonotonicity(
        SqlOperatorBinding call) {
      return SqlStdOperatorTable.CAST.getMonotonicity(call);
    }
  }
  