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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.calcite.adapter.pig;
import org.apache.calcite.sql.SqlKind;
/**
* Supported Pig aggregate functions and their Calcite counterparts. The enum's
* name() is the same as the function's name in Pig Latin.
*/
public enum PigAggFunction {
COUNT(SqlKind.COUNT, false), COUNT_STAR(SqlKind.COUNT, true);
private final SqlKind calciteFunc;
private final boolean star; // as in COUNT(*)
PigAggFunction(SqlKind calciteFunc) {
this(calciteFunc, false);
}
PigAggFunction(SqlKind calciteFunc, boolean star) {
this.calciteFunc = calciteFunc;
this.star = star;
}
public static PigAggFunction valueOf(SqlKind calciteFunc, boolean star) {
for (PigAggFunction pigAggFunction : values()) {
if (pigAggFunction.calciteFunc == calciteFunc && pigAggFunction.star == star) {
return pigAggFunction;
}
}
throw new IllegalArgumentException("Pig agg func for " + calciteFunc + " is not supported");
}
}
// End PigAggFunction.java