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https://issues.apache.org/jira/browse/HIVE-18127?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16280411#comment-16280411
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Andrew Sherman commented on HIVE-18127:
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Hi [~leftylev] thanks for checking, I don't think this needs to be documented
in the wiki. It is a bug fix which makes the system behave as expected.
> Do not strip '--' comments from shell commands issued from CliDriver
> --------------------------------------------------------------------
>
> Key: HIVE-18127
> URL: https://issues.apache.org/jira/browse/HIVE-18127
> Project: Hive
> Issue Type: Bug
> Reporter: Andrew Sherman
> Assignee: Andrew Sherman
> Fix For: 3.0.0
>
> Attachments: HIVE-18127.1.patch, HIVE-18127.2.patch
>
>
> CLiDriver has the ability to run shell commands by prefixing them with '!".
> This behavior is not widely used (there are only 3 examples in .q files).
> Since HIVE-16935 started stripping comments starting with '\-\-', a shell
> command containing '--' will not work correctly.
> Fix this by using the unstripped command for shell commands.
> Note that it would be a security hole for HS2 to allow execution of arbitrary
> shell commands from a client command.
> Add tests to nail down correct behavior with '--' comments:
> * CliDriver should not strip strings starting with '--' in a shell command
> (FIXED in this change).
> * HiveCli should strip '--' comments.
> * A Jdbc program should allow commands starting with "!" but these will fail
> in the sql parser.
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