/*
 * 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.flink.table.functions.sql.internal

import org.apache.calcite.sql.`type`.{OperandTypes, ReturnTypes, SqlTypeFamily}
import org.apache.calcite.sql.{SqlFunction, SqlFunctionCategory, SqlKind}

class SqlRuntimeFilterFunction(
    var ndv: Double,
    var rowCount: Double,
    var builder: SqlRuntimeFilterBuilderFunction) extends SqlFunction(
  s"RUNTIME_FILTER_${builder.broadcastId}", //Unique ID
  SqlKind.OTHER_FUNCTION,
  ReturnTypes.BOOLEAN,
  null,
  // hashCode.
  OperandTypes.family(SqlTypeFamily.ANY),
  SqlFunctionCategory.USER_DEFINED_FUNCTION){

  def getBroadcastId: String = builder.broadcastId

  // we could change the builder.
  override def toString = s"RUNTIME_FILTER_${builder.broadcastId}"
}