Bump sqlalchemy from 1.4.17 to 1.4.18

[dependabot]

Bumps sqlalchemy from 1.4.17 to 1.4.18.

Release notes

Sourced from sqlalchemy's releases.

1.4.18

Released: June 10, 2021

orm

• [orm] [performance] [bug] [regression] Fixed regression involving how the ORM would resolve a given mapped column to a result row, where under cases such as joined eager loading, a slightly more expensive "fallback" could take place to set up this resolution due to some logic that was removed since 1.3. The issue could also cause deprecation warnings involving column resolution to be emitted when using a 1.4 style query with joined eager loading.

  References: #6596

• [orm] [bug] Clarified the current purpose of the _orm.relationship.bake_queries flag, which in 1.4 is to enable or disable "lambda caching" of statements within the "lazyload" and "selectinload" loader strategies; this is separate from the more foundational SQL query cache that is used for most statements. Additionally, the lazy loader no longer uses its own cache for many-to-one SQL queries, which was an implementation quirk that doesn't exist for any other loader scenario. Finally, the "lru cache" warning that the lazyloader and selectinloader strategies could emit when handling a wide array of class/relationship combinations has been removed; based on analysis of some end-user cases, this warning doesn't suggest any significant issue. While setting bake_queries=False for such a relationship will remove this cache from being used, there's no particular performance gain in this case as using no caching vs. using a cache that needs to refresh often likely still wins out on the caching being used side.

  References: #6072, #6487

• [orm] [bug] [regression] Adjusted the means by which classes such as _orm.scoped_session and _asyncio.AsyncSession are generated from the base _orm.Session class, such that custom _orm.Session subclasses such as that used by Flask-SQLAlchemy don't need to implement positional arguments when they call into the superclass method, and can continue using the same argument styles as in previous releases.

  References: #6285

• [orm] [bug] [regression] Fixed issue where query production for joinedload against a complex left hand side involving joined-table inheritance could fail to produce a correct query, due to a clause adaption issue.

  References: #6595

• [orm] [bug] Fixed issue in experimental "select ORM objects from INSERT/UPDATE" use

... (truncated)

Commits

• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot ignore this major version will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this minor version will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself)
• @dependabot ignore this dependency will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)