chore(deps): update sqlalchemy requirement from ~=1.3.15 to ~=1.3.16

[dependabot-preview]

Updates the requirements on sqlalchemy to permit the latest version.

Release notes

Sourced from sqlalchemy's releases.

1.3.16

Released: April 7, 2020

orm

• [orm] [bug] Fixed bug in orm.selectinload() loading option where two or more loaders that represent different relationships with the same string key name as referenced from a single orm.with_polymorphic() construct with multiple subclass mappers would fail to invoke each subqueryload separately, instead making use of a single string-based slot that would prevent the other loaders from being invoked.

  References: #5228

• [orm] [performance] Modified the queries used by subqueryload and selectinload to no longer ORDER BY the primary key of the parent entity; this ordering was there to allow the rows as they come in to be copied into lists directly with a minimal level of Python-side collation. However, these ORDER BY clauses can negatively impact the performance of the query as in many scenarios these columns are derived from a subquery or are otherwise not actual primary key columns such that SQL planners cannot make use of indexes. The Python-side collation uses the native itertools.group_by() to collate the incoming rows, and has been modified to allow multiple row-groups-per-parent to be assembled together using list.extend(), which should still allow for relatively fast Python-side performance. There will still be an ORDER BY present for a relationship that includes an explicit order_by parameter, however this is the only ORDER BY that will be added to the query for both kinds of loading.

  References: #5162

• [orm] [bug] Fixed issue where a lazyload that uses session-local "get" against a target many-to-one relationship where an object with the correct primary key is present, however it's an instance of a sibling class, does not correctly return None as is the case when the lazy loader actually emits a load for that row.

  References: #5210

orm declarative

• [bug] [declarative] [orm] The string argument accepted as the first positional argument by the relationship() function when using the Declarative API is no longer interpreted using the Python eval() function; instead, the name is dot separated and the names are looked up directly in the name resolution dictionary without treating the value as a Python expression. However, passing a string argument to the other relationship() parameters

... (truncated)

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[codecov]

Codecov Report

Merging #6917 into development will not change coverage by %.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #6917   +/-   ##
============================================
  Coverage        66.40%   66.40%           
============================================
  Files              313      313           
  Lines            15359    15359           
============================================
  Hits             10199    10199           
  Misses            5160     5160           

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