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https://issues.apache.org/jira/browse/CALCITE-5652?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18042916#comment-18042916
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Mihai Budiu commented on CALCITE-5652:
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The Calcite parser is preprocessed using a template engine which looks at lines
containing <#if ...> so you can customize the parser at build time.
> How to add a database-specific comment symbol
> ---------------------------------------------
>
> Key: CALCITE-5652
> URL: https://issues.apache.org/jira/browse/CALCITE-5652
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.34.0
> Reporter: Zine eddine Zidane
> Priority: Minor
>
> Is there a clean way to add a database-specific comment symbol? for example,
> the hash symbol "#" is used for inline comments on Mysql, Postgres, and
> Oracle.
> A straightforward way is to just add it to the regular expression definition
> of the SINGLE_LINE_COMMENT keyword below but is this will make it a valid
> symbol regardless of a database which is not the intent
> {code:java}
> <DEFAULT, DQID, BTID, BQID, BQHID> SKIP :
> {
> <SINGLE_LINE_COMMENT: ("//" | "--") (~["\n","\r"])* ("\r\n"|"\r"|"\n")?>
> } {code}
>
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