dongjoon-hyun commented on a change in pull request #24335: [SPARK-27425][SQL] Add count_if functions URL: https://github.com/apache/spark/pull/24335#discussion_r291436969
########## File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/CountIf.scala ########## @@ -0,0 +1,55 @@ +/* + * 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.analysis.TypeCheckResult +import org.apache.spark.sql.catalyst.expressions._ +import org.apache.spark.sql.types._ + +@ExpressionDescription( + usage = """ + _FUNC_(expr) - Returns the number of rows that the supplied expression is non-null and true. + """, + 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 + """, + since = "3.0.0") +case class CountIf(predicate: Expression) extends UnevaluableAggregate with ImplicitCastInputTypes { + override def prettyName: String = "count_if" + + override def children: Seq[Expression] = predicate :: Nil + + override def nullable: Boolean = false + + override def dataType: DataType = LongType + + override def inputTypes: Seq[AbstractDataType] = BooleanType :: Nil Review comment: nit. ```scala override def inputTypes: Seq[AbstractDataType] = Seq(BooleanType) ``` ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
