Github user yhuai commented on a diff in the pull request: https://github.com/apache/spark/pull/9019#discussion_r41568645 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects.scala --- @@ -0,0 +1,334 @@ +/* + * 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 + +import scala.language.existentials + +import org.apache.spark.sql.catalyst.InternalRow +import org.apache.spark.sql.catalyst.expressions.codegen.{GeneratedExpressionCode, CodeGenContext} +import org.apache.spark.sql.types._ + +/** + * Invokes a static function, returning the result. By default, any of the arguments being null + * will result in returning null instead of calling the function. + * + * @param staticObject The target of the static call. This can either be the object itself + * (methods defined on scala objects), or the class object + * (static methods defined in java). + * @param dataType The expected return type of the function call + * @param functionName The name of the method to call. + * @param arguments An optional list of expressions to pass as arguments to the function. + * @param propagateNull When true, and any of the arguments is null, null will be returned instead + * of calling the function. + */ --- End diff -- Maybe add examples to expressions defined in this file to make how they will be used more obvious?
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