org.apache.flink.table.functions.sql.SqlFirstLastValueAggFunction.scala Maven / Gradle / Ivy

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/*
 * 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

import java.util

import com.google.common.collect.ImmutableList
import org.apache.calcite.rel.`type`.{RelDataType, RelDataTypeFactory}
import org.apache.calcite.sql._
import org.apache.calcite.sql.`type`._

class SqlFirstLastValueAggFunction(kind: SqlKind) extends SqlAggFunction(
  kind.name(),
  null.asInstanceOf[SqlIdentifier],
  kind,
  ReturnTypes.ARG0_NULLABLE_IF_EMPTY,
  null.asInstanceOf[SqlOperandTypeInference],
  OperandTypes.or(OperandTypes.ANY, OperandTypes.family(SqlTypeFamily.ANY, SqlTypeFamily.ANY)),
  SqlFunctionCategory.NUMERIC,
  false,
  false) {
  override def getParameterTypes(typeFactory: RelDataTypeFactory): util.List[RelDataType] =
      ImmutableList.of(
        typeFactory.createTypeWithNullability(typeFactory.createSqlType(SqlTypeName.ANY),true),
        typeFactory.createTypeWithNullability(typeFactory.createSqlType(SqlTypeName.ANY), true))

  override def getReturnType(typeFactory: RelDataTypeFactory): RelDataType =
    typeFactory.createTypeWithNullability(typeFactory.createSqlType(SqlTypeName.ANY), true)

}