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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