Use pgx 0.6.1 with PostgreSQL 15 support

[syvb]

No description provided.

[syvb]

Current status: this passes on CI up to the point where it tries to run doc-tests, which fail since I removed TimescaleDB from the Docker image, since TimescaleDB doesn't support pg15 yet.

[syvb]

The CI now passes on this branch, although we don't run doc/upgrade tests for pg15 yet.

[epgts]

Looks good!

[syvb]

Updated the PR to pgx 0.6.1, released 2 hours ago. The CI still passes when run with the Docker image from this branch.

[syvb]

I rebased and updated the changelog entry to indicate that PostgreSQL 15 support is experimental. I ran the CI again, it still passes.

[epgts]

Actually, hang on, what's wrong with Clippy?

[rtwalker]

Actually, hang on, what's wrong with Clippy?

I think the new pgx is using a feature that was stabilized in Rust 1.63 which our older (1.60?) clippy still thinks is unstable.

[syvb]

The error with Clippy happens when you try to compile pgx with rustc < 1.63, since rustc 1.63 stabilized a library feature that pgx relies on:

error[E0658]: use of unstable library feature 'slice_ptr_len'
  --> /usr/local/cargo/registry/src/github.aaakk.us.kg-1ecc6299db9ec823/pgx-0.6.1/src/slice.rs:28:32
   |
28 |         index.le(&self.pallocd.len()).then(|| self.get_unchecked(index))
   |                                ^^^
   |
   = note: see issue #71146 <https://github.com/rust-lang/rust/issues/71146> for more information

This PR updates the Docker image to rustc 1.63 which stabilizes the needed feature. (which is why the CI passes on the Docker image built from this branch)

[epgts]

Of course. When Brian approves this, you can publish the image from this branch and then the checks will clear? Thanks!

[syvb]

bors r+

[bors]

Build succeeded:

• Clippy/rustfmt Test
• Test Postgres (12)
• Test Postgres (13)
• Test Postgres (14)