LucaCappelletti94 opened a new pull request, #2356:
URL: https://github.com/apache/datafusion-sqlparser-rs/pull/2356

   Adds support for the SQL standard `ARRAY` keyword in array type 
declarations, such as `INTEGER ARRAY` and `INTEGER ARRAY[4]`, which PostgreSQL 
accepts anywhere a type is expected (column definitions, casts, and the `::` 
operator). It is gated behind a new 
`Dialect::supports_array_typedef_with_keyword` method, enabled for PostgreSQL, 
and the keyword form with its optional cardinality is represented by a new 
`ArrayElemTypeDef::Keyword` variant.
   
   This also unifies the existing MySQL multi-valued index syntax `CAST(... AS 
UNSIGNED ARRAY)`. The `array: bool` field on `Expr::Cast` is removed and the 
trailing `ARRAY` keyword is now captured through `ArrayElemTypeDef::Keyword` 
for every dialect, so this is a breaking change to the AST. Parser behavior is 
unchanged for all dialects, only the representation is unified, and round-trip 
serialization is preserved.
   


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