Bump sqlalchemy from 1.4.18 to 1.4.19

[dependabot]

Bumps sqlalchemy from 1.4.18 to 1.4.19.

Release notes

Sourced from sqlalchemy's releases.

1.4.19

Released: June 22, 2021

orm

• [orm] [bug] [regression] Fixed further regressions in the same area as that of #6052 where loader options as well as invocations of methods like _orm.Query.join() would fail if the left side of the statement for which the option/join depends upon were replaced by using the _orm.Query.with_entities() method, or when using 2.0 style queries when using the _sql.Select.with_only_columns() method. A new set of state has been added to the objects which tracks the "left" entities that the options / join were made against which is memoized when the lead entities are changed.

  References: #6253, #6503

• [orm] [bug] Refined the behavior of ORM subquery rendering with regards to deferred columns and column properties to be more compatible with that of 1.3 while also providing for 1.4's newer features. As a subquery in 1.4 does not make use of loader options, including _orm.undefer(), a subquery that is against an ORM entity with deferred attributes will now render those deferred attributes that refer directly to mapped table columns, as these are needed in the outer SELECT if that outer SELECT makes use of these columns; however a deferred attribute that refers to a composed SQL expression as we normally do with _orm.column_property() will not be part of the subquery, as these can be selected explicitly if needed in the subquery. If the entity is being SELECTed from this subquery, the column expression can still render on "the outside" in terms of the derived subquery columns. This produces essentially the same behavior as when working with 1.3. However in this case the fix has to also make sure that the .selected_columns collection of an ORM-enabled _sql.select() also follows these rules, which in particular allows recursive CTEs to render correctly in this scenario, which were previously failing to render correctly due to this issue.

  References: #6661

sql

• [sql] [bug] Fixed issue in CTE constructs mostly relevant to ORM use cases where a recursive CTE against "anonymous" labels such as those seen in ORM column_property() mappings would render in the WITH RECURSIVE xyz(...) section as their raw internal label and not a cleanly anonymized name.

  References: #6663

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