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.type;
  
  import org.apache.calcite.rel.type.RelDataType;
  import org.apache.calcite.sql.SqlCallBinding;
  
  /**
   * Strategy to infer unknown types of the operands of an operator call.
   *
   * @see InferTypes
   */
  public interface SqlOperandTypeInference {
    //~ Methods ----------------------------------------------------------------
  
    /**
     * Infers any unknown operand types.
     *
     * @param callBinding  description of the call being analyzed
     * @param returnType   the type known or inferred for the result of the call
     * @param operandTypes receives the inferred types for all operands
     */
    void inferOperandTypes(
        SqlCallBinding callBinding,
        RelDataType returnType,
        RelDataType[] operandTypes);
  }
  