com.hazelcast.org.apache.calcite.sql.fun.SqlHistogramAggFunction Maven / Gradle / Ivy
/*
* 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 com.hazelcast.org.apache.calcite.sql.fun;
import com.hazelcast.org.apache.calcite.rel.type.RelDataType;
import com.hazelcast.org.apache.calcite.rel.type.RelDataTypeFactory;
import com.hazelcast.org.apache.calcite.sql.SqlAggFunction;
import com.hazelcast.org.apache.calcite.sql.SqlFunctionCategory;
import com.hazelcast.org.apache.calcite.sql.SqlKind;
import com.hazelcast.org.apache.calcite.sql.type.OperandTypes;
import com.hazelcast.org.apache.calcite.sql.type.ReturnTypes;
import com.hazelcast.org.apache.calcite.util.Optionality;
import com.hazelcast.com.google.common.collect.ImmutableList;
import java.util.List;
/**
* HISTOGRAM
is the base operator that supports the Histogram
* MIN/MAX aggregate functions. It returns the sum of the values which go
* into it. It has precisely one argument of numeric type (int
,
* long
, float
, double
); results are
* retrieved using (HistogramMin
) and (HistogramMax
).
*/
public class SqlHistogramAggFunction extends SqlAggFunction {
//~ Instance fields --------------------------------------------------------
@Deprecated // to be removed before 2.0
private final RelDataType type;
//~ Constructors -----------------------------------------------------------
public SqlHistogramAggFunction(RelDataType type) {
super(
"$HISTOGRAM",
null,
SqlKind.OTHER_FUNCTION,
ReturnTypes.HISTOGRAM,
null,
OperandTypes.NUMERIC_OR_STRING,
SqlFunctionCategory.NUMERIC,
false,
false,
Optionality.FORBIDDEN);
this.type = type;
}
//~ Methods ----------------------------------------------------------------
@SuppressWarnings("deprecation")
@Override public List getParameterTypes(RelDataTypeFactory typeFactory) {
return ImmutableList.of(type);
}
@Deprecated // to be removed before 2.0
public RelDataType getType() {
return type;
}
@SuppressWarnings("deprecation")
@Override public RelDataType getReturnType(RelDataTypeFactory typeFactory) {
return type;
}
}
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