/**
* 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.tajo.engine.function.builtin;
import org.apache.tajo.catalog.Column;
import org.apache.tajo.engine.function.FunctionContext;
import org.apache.tajo.common.TajoDataTypes.Type;
import org.apache.tajo.datum.NullDatum;
import org.apache.tajo.storage.Tuple;
/**
* Count(column) function
*/
public final class CountValue extends CountRows {
public CountValue() {
super(new Column[] {
new Column("col", Type.ANY)
});
}
@Override
public void eval(FunctionContext ctx, Tuple params) {
if (!(params.get(0) instanceof NullDatum)) {
((CountRowContext) ctx).count++;
}
}
}