[queries] Support double question mark

[cmizzi]

As you may know, since PHP 7.4, it is now possible to use special operators (known mainly under PostgreSQL as ?, ?|, ?&...) by doubling the question mark (??, ??|, ??&...). The formatter didn't support this feature, it's done now.

In addition, the formatter replaces the question mark escape so that it can be easily copied and pasted to debug a query. I also implemented a test on this feature.

SELECT ('[1, 2, 3]'::jsonb ?? ?) as a, ('[4, 5, 6]'::jsonb ??| ?) as b, 'hello world ? example ??' as c

Bindings : [3, '{4}']

-SELECT ('[1, 2, 3]'::jsonb 3'{4}' ?) as a, ('[4, 5, 6]'::jsonb ??| ?) as b, 'hello world ? example ??' as c
+SELECT ('[1, 2, 3]'::jsonb ? 3) as a, ('[4, 5, 6]'::jsonb ?| '{4}') as b, 'hello world ? example ??' as c

[barryvdh]

How does this work? Is that postgre specific?

[cmizzi]

@barryvdh

At the moment, it seems that only PostgreSQL defines operators containing ? (not enough skill on other RDMSs to confirm). However, the RFC has been directly implemented in SQL Parser PDO.

• https://wiki.php.net/rfc/pdo_escape_placeholders ;
• Fix FR #71885 (Allow escaping question mark placeholders) php/php-src#4217 ;