Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/19808#discussion_r152951398
--- Diff: bin/spark-sql.cmd ---
@@ -0,0 +1,25 @@
+@echo off
+
+rem
+rem Licensed to the Apache Software Foundation (ASF) under one or more
+rem contributor license agreements. See the NOTICE file distributed with
+rem this work for additional information regarding copyright ownership.
+rem The ASF licenses this file to You under the Apache License, Version 2.0
+rem (the "License"); you may not use this file except in compliance with
+rem the License. You may obtain a copy of the License at
+rem
+rem http://www.apache.org/licenses/LICENSE-2.0
+rem
+rem Unless required by applicable law or agreed to in writing, software
+rem distributed under the License is distributed on an "AS IS" BASIS,
+rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
+rem See the License for the specific language governing permissions and
+rem limitations under the License.
+rem
+
+rem This is the entry point for running SparkSQL. To avoid polluting the
+rem environment, it just launches a new cmd to do the real work.
+
+rem The outermost quotes are used to prevent Windows command line parse
error
+rem when there are some quotes in parameters, see SPARK-21877.
+cmd /V /E /C ""%~dp0spark-sql2.cmd" %*"
--- End diff --
AFAIK, `export` in bash affects its subprocesses so it doesn't affect the
parent. I somehow knew this but .. haven't thought deeply before. I think this
is just a difference between OSes, maybe missing concept of forking on Windows.
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