org.apache.flink.table.planner.delegation.hive.copy.HiveParserSqlCountAggFunction 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,
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*/
package org.apache.flink.table.planner.delegation.hive.copy;
import org.apache.calcite.rel.core.AggregateCall;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.sql.SqlAggFunction;
import org.apache.calcite.sql.SqlFunctionCategory;
import org.apache.calcite.sql.SqlKind;
import org.apache.calcite.sql.SqlSplittableAggFunction;
import org.apache.calcite.sql.type.SqlOperandTypeChecker;
import org.apache.calcite.sql.type.SqlOperandTypeInference;
import org.apache.calcite.sql.type.SqlReturnTypeInference;
import org.apache.calcite.sql.type.SqlTypeName;
import org.apache.calcite.util.ImmutableIntList;
/**
* Counterpart of hive's
* org.apache.hadoop.hive.ql.optimizer.calcite.functions.HiveSqlCountAggFunction.
*/
public class HiveParserSqlCountAggFunction extends SqlAggFunction
implements HiveParserSqlFunctionConverter.CanAggregateDistinct {
final boolean isDistinct;
final SqlReturnTypeInference returnTypeInference;
final SqlOperandTypeInference operandTypeInference;
final SqlOperandTypeChecker operandTypeChecker;
public HiveParserSqlCountAggFunction(
boolean isDistinct,
SqlReturnTypeInference returnTypeInference,
SqlOperandTypeInference operandTypeInference,
SqlOperandTypeChecker operandTypeChecker) {
super(
"count",
SqlKind.COUNT,
returnTypeInference,
operandTypeInference,
operandTypeChecker,
SqlFunctionCategory.NUMERIC);
this.isDistinct = isDistinct;
this.returnTypeInference = returnTypeInference;
this.operandTypeChecker = operandTypeChecker;
this.operandTypeInference = operandTypeInference;
}
@Override
public boolean isDistinct() {
return isDistinct;
}
@Override
public T unwrap(Class clazz) {
if (clazz == SqlSplittableAggFunction.class) {
return clazz.cast(new HiveCountSplitter());
}
return super.unwrap(clazz);
}
class HiveCountSplitter extends SqlSplittableAggFunction.CountSplitter {
@Override
public AggregateCall other(RelDataTypeFactory typeFactory, AggregateCall e) {
return AggregateCall.create(
new HiveParserSqlCountAggFunction(
isDistinct,
returnTypeInference,
operandTypeInference,
operandTypeChecker),
false,
ImmutableIntList.of(),
-1,
typeFactory.createTypeWithNullability(
typeFactory.createSqlType(SqlTypeName.BIGINT), true),
"count");
}
}
}