Github user paul-rogers commented on a diff in the pull request:
https://github.com/apache/drill/pull/619#discussion_r86435395
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/util/StdErrCapturer.java ---
@@ -0,0 +1,83 @@
+/**
+ * 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.drill.exec.util;
+
+
+import java.io.ByteArrayOutputStream;
+import java.io.OutputStream;
+import java.io.PrintStream;
+import java.nio.charset.StandardCharsets;
+
+/**
+ * The safe way to use this class is to redirect System.err to
nullOutputStream.
+ * If callers want to get the redirected output -ito print or log
elsewhere - as used in unit tests and they
+ * need the output to be neat, then there should be advanced ways to
preserve the output to avoid concurrent
+ * inputs messing up. But this class is not designed for that.
+ */
+public class StdErrCapturer {
+ static private PrintStream savedStdErr;
+ static private OutputStream buffer;
+ static private PrintStream capturingStream;
+ static Boolean redirected = false;
+
+ public static void redirect() {
--- End diff --
Do in constructor (so it can be reversed in close.)
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