Github user DaveDeCaprio commented on a diff in the pull request: https://github.com/apache/spark/pull/23169#discussion_r237344141 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/SizeLimitedWriter.scala --- @@ -0,0 +1,48 @@ +/* + * 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.util + +import java.io.Writer + +class WriterSizeException(val attemptedSize: Long, val charLimit: Long) extends Exception( + s"Attempted to write $attemptedSize characters to a writer that is limited to $charLimit") + +/** + * This class is used to control the size of generated writers. Guarantees that the total number + * of characters written will be less than the specified size. + * + * Checks size before writing and throws a WriterSizeException if the total size would count the + * limit. + */ +class SizeLimitedWriter(underlying: Writer, charLimit: Long) extends Writer { + + var charsWritten: Long = 0 + + override def write(cbuf: Array[Char], off: Int, len: Int): Unit = { --- End diff -- I changed to writing out to the full limit
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