teach #[pg_cast] to support 3-argument CAST functions
#2119
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CAST functions can have 1 argument or 3 arguments where the latter is
the source type plus the type modifier ("typmod") and explicit context
for the destination type.
This changes `#[pg_cast]` to blindly support any number of arguments on
the function to which it's attach and then Postgres will sort it out
during DDL playback.
eeeebbbbrrrr
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Aug 1, 2025
Welcome to pgrx v0.16.0. This release contains support for Postgres 18beta2 and has some breaking changes in that support for pgrx' "hooks" implementation, which has been deprecated for over a year, has finally been removed. Additionally, due to unsoundness issues, direct support for using `heapless` in shared memory has been removed. Users can still do this themselves, which requires them to assert they're taking responsibility of possible unsoundness issues. As always, first install the latest `cargo-pgrx` with: ```shell $ cargo install cargo-pgrx --version 0.16.0 --locked ``` Then you're free to run `cargo pgrx upgrade` in the root of all your extension crates. To pickup pg18beta2 support you'll also want to run `cargo pgrx init` so that it can be downloaded and compiled. # What's Changed ## Breaking Changes * delete `pgrx::hooks` by @usamoi in #2120 * improve shmem api by @usamoi in #2107 ## New Features * update to Postgres v18beta2 by @usamoi in #2111 * feat: `BackgroundWorker::connect_worker_to_spi_by_oid` by @if0ne in #2116 * teach `#[pg_cast]` to support 3-argument CAST functions by @eeeebbbbrrrr in #2119 * teach `#[pg_extern]` about a SUPPORT function by @eeeebbbbrrrr in #2121 ## Bug Fixes * fix name_data_to_str by @usamoi in #2108 * add pg_guard_ffi_boundary to direct_pg_extern_function_call_as_datum by @usamoi in #2118 ## `cargo-pgrx` Improvements * add `--valgrind` to more cargo-pgrx subcommands by @usamoi in #2109 * `cargo pgrx regress --resetdb` will run `setup.sql` by @ccleve in #2113 ## Code Cleanup * filter out unrecognized attributes in PostgresGucEnum by @usamoi in #2102 * Elide needless lifetime by @nyurik in #2097 ## Package/Build System Cleanup * chore: include pgrx-version-updater into workspace by @nyurik in #2101 * chore: consolidate package settings in workspace by @nyurik in #2100 * chore: prepare for 2024 edition by @nyurik in #2103 # Thanks! Thanks to all contributors -- y'alls work helps keep pgrx moving forward. **Full Changelog**: v0.15.0...v0.16.0
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CAST functions can have 1 argument or 3 arguments where the latter is the source type plus the type modifier ("typmod") and explicit context for the destination type.
This changes
#[pg_cast]to blindly support any number of arguments on the function to which it's attached and then Postgres will sort it out during DDL playback.