Add support for named parameter placeholders?

[downhiller]

The tree reports an (ERROR) when it finds the colon in:

SELECT * FROM users where user_id = :userId;

as one might have in a PDO statement in php code.

Thank you, it would be very useful to me to see this added!

[DerekStride]

I think this would fit under the parameter node, are you able to open a PR with a test?

tree-sitter-sql/grammar.js

Line 2938 in d63cfed

parameter: $ => /\?|(\$[0-9]+)/,