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https://issues.apache.org/jira/browse/PIG-519?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12646617#action_12646617
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Alan Gates commented on PIG-519:
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'#' already has a meaning in pig as the dereference operator for maps. The
current parser does successfully distinguish between a # comment and map#key,
but this is do to the particular parser used and the rather strange division of
parsing between grunt and pig. I don't want to tie ourselves to either of
these artifacts of the current implementation. Also, I think it is somewhat
confusing to users (e.g., I've never liked the way ':' has at least 5 different
meanings in C++). Plus, do we need two different comment operators (-- and #)?
Is your only goal to allow #! at the head of a script to work? If so, I think
explicitly allowing #! at the head of a line would be a fine addition to the
language, and not suffer from the issues I point out above.
> allow for '#' to signify a comment in a PIG script
> --------------------------------------------------
>
> Key: PIG-519
> URL: https://issues.apache.org/jira/browse/PIG-519
> Project: Pig
> Issue Type: Wish
> Components: grunt
> Environment: linux/unix
> Reporter: Ian Holsman
> Priority: Trivial
> Attachments: comment.patch, pig.pig
>
>
> in unix type operating systems, it is common to just run scripts directly
> from the shell.
> In order to do this scripts need to have the command to run them on the first
> line similar to
> #!/usr/bin/env pig -
> this patch allows you to just run scripts without specifying pig -f XXX
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