Is your feature request related to a problem? Please describe.
I have a column in my MySql DB: Column: FileName, Collation: utf8mb4_0900_bin, Definition: varchar(255), which when I try to convert to a struct:

#[derive(sqlx::FromRow)]
#[sqlx(rename_all = "PascalCase")]
struct Row {
  file_name: String
}

throws an error:

error occurred while decoding column "FileName": mismatched types; Rust type
  | `alloc::string::String` (as SQL type `VARCHAR`) is not compatible with SQL
  | type `VARBINARY`

Describe the solution you'd like
This conversion should work, since the actual type is a VARCHAR, not VARBINARY

Describe alternatives you've considered
I could store these variables as Vec<u8>, or manually impl FromRow, but that's obviously not ideal.

Additional context
I assume the collation is what's causing sqlx to interpret the type as VARBINARY?