flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/sql/internal/SqlThrowExceptionFunction.scala

/*
 * 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
import org.apache.calcite.sql.{SqlFunction, SqlFunctionCategory, SqlKind, SqlSyntax}
import org.apache.flink.table.api.types.InternalType
import org.apache.flink.table.calcite.FlinkTypeFactory
import org.apache.flink.table.functions.utils.AggSqlFunction

class SqlThrowExceptionFunction(
    tp: InternalType,
    typeFactory: FlinkTypeFactory) extends SqlFunction(
  s"ThrowException",
  SqlKind.OTHER_FUNCTION,
  AggSqlFunction.createReturnTypeInference(tp, typeFactory),
  null,
  OperandTypes.STRING,
  SqlFunctionCategory.USER_DEFINED_FUNCTION) {

  override def getSyntax: SqlSyntax = {
    SqlSyntax.FUNCTION
  }

  // Plans referencing context variables should never be cached
  override def isDynamicFunction: Boolean = {
    true
  }
}