[MinJaeRun]

Does your PR solve an issue?

closes #4452

Is this a breaking change?

No. This is a bug fix for silent data loss when decoding PostgreSQL text arrays containing the literal string "NULL".

Description

In PostgreSQL's text array serialization format, an unquoted NULL element represents SQL NULL, whereas a quoted "NULL" element represents the literal string "NULL":

SELECT ARRAY['NULL', NULL, 'null']::text[]; -- serializes as: {"NULL",NULL,null}

Previously, sqlx-postgres/src/types/array.rs unquoted the element text before checking if value == "NULL", erroneously decoding the string "NULL" into None (SQL NULL) instead of Some("NULL").

This patch tracks whether the parsed element was enclosed in quotes (was_quoted) so that only unquoted NULL tokens are mapped to None.

Includes unit tests verifying both Vec<Option<String>> and Vec<String> in sqlx-postgres/src/types/array.rs and integration coverage in tests/postgres/types.rs.

[abonander]

cargo fmt needs to be run, otherwise LGTM.

[MinJaeRun]

Ran cargo fmt across the modified files as requested! Ready for re-review. Thanks @abonander!