/*
 * 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.spark.sql.catalyst.util

object SQLOrderingUtil {

  /**
   * A special version of double comparison that follows SQL semantic:
   *  1. NaN == NaN
   *  2. NaN is greater than any non-NaN double
   *  3. -0.0 == 0.0
   */
  def compareDoubles(x: Double, y: Double): Int = {
    if (x == y) 0 else java.lang.Double.compare(x, y)
  }

  /**
   * A special version of float comparison that follows SQL semantic:
   *  1. NaN == NaN
   *  2. NaN is greater than any non-NaN float
   *  3. -0.0 == 0.0
   */
  def compareFloats(x: Float, y: Float): Int = {
    if (x == y) 0 else java.lang.Float.compare(x, y)
  }
}
