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https://issues.apache.org/jira/browse/CALCITE-5378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17632110#comment-17632110
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Aaron Braunstein commented on CALCITE-5378:
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I can open a quick PR for this but probably easier if an existing calcite
contributor does it, if someone can lend a hand :)
> Single line comment tokens should be recoverable during SQL parsing
> -------------------------------------------------------------------
>
> Key: CALCITE-5378
> URL: https://issues.apache.org/jira/browse/CALCITE-5378
> Project: Calcite
> Issue Type: Wish
> Components: core
> Reporter: Aaron Braunstein
> Priority: Major
> Labels: lexer, sql
>
> Currently SINGLE_LINE_COMMENT tokens are of type SKIP which makes them
> totally inaccessible during parsing. They should be type SPECIAL_TOKEN (like
> multiline comment tokens) so they can be optionally recovered during parsing.
> [Reference|https://javacc.github.io/javacc/tutorials/token-manager.html]
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