spark CountIf 源码
spark CountIf 代码
文件路径：/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CountIf.scala
/*
* 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.spark.sql.catalyst.expressions.aggregate
import org.apache.spark.sql.catalyst.expressions.{Expression, ExpressionDescription, ImplicitCastInputTypes, Literal, NullIf, RuntimeReplaceableAggregate}
import org.apache.spark.sql.catalyst.trees.UnaryLike
import org.apache.spark.sql.types.{AbstractDataType, BooleanType}
@ExpressionDescription(
usage = """
_FUNC_(expr) - Returns the number of `TRUE` values for the expression.
""",
examples = """
Examples:
> SELECT _FUNC_(col % 2 = 0) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col);
2
> SELECT _FUNC_(col IS NULL) FROM VALUES (NULL), (0), (1), (2), (3) AS tab(col);
1
""",
group = "agg_funcs",
since = "3.0.0")
case class CountIf(child: Expression)
extends AggregateFunction
with RuntimeReplaceableAggregate
with ImplicitCastInputTypes
with UnaryLike[Expression] {
override lazy val replacement: Expression = Count(new NullIf(child, Literal.FalseLiteral))
override def nodeName: String = "count_if"
override def inputTypes: Seq[AbstractDataType] = Seq(BooleanType)
override protected def withNewChildInternal(newChild: Expression): CountIf =
copy(child = newChild)
}
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