Postgres arrays and records do not fully support custom types. When encountering an unknown OID, they currently default to using `PgTypeInfo::with_oid`. This is invalid as it breaks the invariant that decoding only uses resolved types, leading to panics.
This commit returns an error instead of panicking. This is merely a mitigation: a proper fix would actually add full support for custom Postgres types. Full support involves more work, so it may still be useful to fix this immediate issue.
Related issues:
- https://github.com/launchbadge/sqlx/issues/1672
- https://github.com/launchbadge/sqlx/issues/1797
* Add Query builder
* Make query_builder.rs in sqlx-core
* Add QueryBuilder::new()
* Add QueryBuilder::push()
* Define questions for documentation
* Get new, push, push_bind working with types
* Handle postgres' numbered bind varaibles
* Add a test for QueryBuilder#build
* Move arguments into Option
* Refactor query builder
* Finish testing QueryBuilder#build
* Remove design doc
* Add a test for pushing strings with push_bind
* Integration test green
* Adjust some tests
* Make query builder generic about placeholder segmenent ('$N' or '?')
* Run fmt
* Redesign Arguments#format_placeholder in line with code review
* Use write! to push sql to QueryBuilder
* Add QueryBuilder::reset to allow for QueryBuilder reuse
* Run cargo fmt
