MaxGekk commented on code in PR #36584: URL: https://github.com/apache/spark/pull/36584#discussion_r876227678
########## sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/AnyValue.scala: ########## @@ -0,0 +1,64 @@ +/* + * 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._ +import org.apache.spark.sql.catalyst.trees.UnaryLike +import org.apache.spark.sql.types._ + +/** + * Returns the first value of `child` for a group of rows. If the first value of `child` + * is `null`, it returns `null` (respecting nulls). Even if [[AnyValue]] is used on an already + * sorted column, if we do partial aggregation and final aggregation (when mergeExpression + * is used) its result will not be deterministic (unless the input table is sorted and has + * a single partition, and we use a single reducer to do the aggregation.). + * Interchangeable with [[First]]. + */ +@ExpressionDescription( + usage = """ + _FUNC_(expr[, isIgnoreNull]) - Returns some value of `expr` for a group of rows. + If `isIgnoreNull` is true, returns only non-null values.""", + examples = """ + Examples: + > SELECT _FUNC_(col) FROM VALUES (10), (5), (20) AS tab(col); + 10 + > SELECT _FUNC_(col) FROM VALUES (NULL), (5), (20) AS tab(col); + NULL + > SELECT _FUNC_(col, true) FROM VALUES (NULL), (5), (20) AS tab(col); + 5 + """, + note = """ + The function is non-deterministic. + """, + group = "agg_funcs", + since = "3.3.0") Review Comment: Since SPARK-39213 is not in the allow list for 3.3 (see https://lists.apache.org/thread/2tl67py05t1620v3fk8ms672mnxt6nol), the changes shouldn't be targeted to 3.3. Please, change the version to 3.4.0 here and other places. -- 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. To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
