Hi,
I'm trying to extend Calcite grammar to support some custom statements. And
I need to increase LOOKAHEAD to 3 to resolve some ambiguity. But when I did
that, the parser fails to parse queries like:
* select t.key from (select key from src) t*
With exception:
*Caused by: org.apache.calcite.sql.parser.impl.ParseException:*
*Encountered "( select key" at line 1, column 19.*
*Was expecting one of:*
* <IDENTIFIER> ...*
* <QUOTED_IDENTIFIER> ...*
* <BACK_QUOTED_IDENTIFIER> ...*
* <BRACKET_QUOTED_IDENTIFIER> ...*
* <UNICODE_QUOTED_IDENTIFIER> ...*
* "LATERAL" ...*
* "(" "WITH" ...*
*...*
So I'm wondering whether there's some limitation on the LOOKAHEAD we can
use?
--
Best regards!
Rui Li
