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.adapter.hive;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlCallBinding;
  import org.apache.calcite.sql.SqlDynamicParam;
  import org.apache.calcite.sql.SqlLiteral;
  import org.apache.calcite.sql.SqlNode;
  import org.apache.calcite.sql.SqlOperatorBinding;
  import org.apache.calcite.sql.fun.SqlCastFunction;
  import org.apache.calcite.sql.validate.SqlValidatorImpl;
  
  /**
   *
   */
  public class HiveSqlCastFunction extends SqlCastFunction {
  
    @Override public RelDataType inferReturnType(SqlOperatorBinding opBinding) {
      assert opBinding.getOperandCount() == 2;
      RelDataType ret = opBinding.getOperandType(1);
      ret =
          opBinding.getTypeFactory().createTypeWithNullability(
              ret,
              true);
      if (opBinding instanceof SqlCallBinding) {
        SqlCallBinding callBinding = (SqlCallBinding) opBinding;
        SqlNode operand0 = callBinding.operand(0);
  
        // dynamic parameters and null constants need their types assigned
        // to them using the type they are casted to.
        if (((operand0 instanceof SqlLiteral)
            && (((SqlLiteral) operand0).getValue() == null))
            || (operand0 instanceof SqlDynamicParam)) {
          final SqlValidatorImpl validator =
              (SqlValidatorImpl) callBinding.getValidator();
          validator.setValidatedNodeType(operand0, ret);
        }
      }
      return ret;
    }
  }
  
  // End HiveSqlCastFunction.java
  