Improving support for `CREATE PROCEDURE`

[ZacJW]

sqlparser-rs currently doesn't have great support for CREATE PROCEDURE statements, leading to parser errors when I pass in valid SQL. I'd like to work on improving this (I've already started on my fork).

What's the project's ideal vision for how this would be handled? Stored procedures are the kind of thing that can be very RDBMS specific. Do you just want the AST to cover what's in the standard, but the dialects to accept but discard additional options?

The first fix which will be ready to go once I've written tests is #1901, support for what PostgreSQL calls argmode and the standard calls parameter mode.

PRs

• Support procedure argmode #1901
• Add support for LANGUAGE clause in CREATE PROCEDURE #1903