Sure, you could change the parser. I suggest you add a few tests to 
SqlParserTest and then change Parser.jj until the tests pass. You could then 
translate your query to the same as RelNode tree as “select * from A limit 10”, 
and Calcite can execute that.

Log a JIRA case describing the syntax you intend to implement.

Julian


> On Apr 17, 2017, at 4:46 PM, Yishu_Coder Lin <[email protected]> wrote:
> 
> Hi guys,
> 
> I just started to use Calcite's SQL parser. I am working on a project
> related to Teradata and I found calcite doesn't support SQL syntax like
> 'select top 10 * from A'.
> 
> Is there anyway that I can change the parser to support syntax like this?
> Please advise. Thanks!
> 
> Regards,
> Yishu

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