Operators @@ is not supported by the parser

[MatthieuVegreville]

Hello Olivier,

Hope you're doing well. We're getting back to the project of fully pushing in-memory database for the Greenly project. Right now, the definition of operators is restrictive in the lexer compared to SQL definition and doesn't support the operator @@ that we use with the methods to_tsvector and ts_query for example. Do you think you could add it?

Thanks, Matt

Also: we'd like to support the project once we can confirm we can use it in our env!