Bump sqlalchemy from 1.4.14 to 1.4.15

[dependabot]

Bumps sqlalchemy from 1.4.14 to 1.4.15.

Release notes

Sourced from sqlalchemy's releases.

1.4.15

Released: May 11, 2021

general

• [general] [feature] A new approach has been applied to the warnings system in SQLAlchemy to accurately predict the appropriate stack level for each warning dynamically. This allows evaluating the source of SQLAlchemy-generated warnings and deprecation warnings to be more straightforward as the warning will indicate the source line within end-user code, rather than from an arbitrary level within SQLAlchemy's own source code.

  References: #6241

orm

• [orm] [bug] [regression] Fixed additional regression caused by "eager loaders run on unexpire" feature #1763 where the feature would run for a contains_eager() eagerload option in the case that the contains_eager() were chained to an additional eager loader option, which would then produce an incorrect query as the original query-bound join criteria were no longer present.

  References: #6449

• [orm] [bug] Fixed issue in subquery loader strategy which prevented caching from working correctly. This would have been seen in the logs as a "generated" message instead of "cached" for all subqueryload SQL emitted, which by saturating the cache with new keys would degrade overall performance; it also would produce "LRU size alert" warnings.

  References: #6459

sql

• [sql] [bug] Adjusted the logic added as part of #6397 in 1.4.12 so that internal mutation of the BindParameter object occurs within the clause construction phase as it did before, rather than in the compilation phase. In the latter case, the mutation still produced side effects against the incoming construct and additionally could potentially interfere with other internal mutation routines.

  References: #6460

mysql

... (truncated)

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