[Sqlalchemy-commits] commit/sqlalchemy: 2 new changesets

[Bitbucket <com...@bi...>]

2 new commits in sqlalchemy:

https://bitbucket.org/zzzeek/sqlalchemy/commits/1a7e8d77bae2/
Changeset:   1a7e8d77bae2
Branch:      None
User:        zzzeek
Date:        2017-02-16 16:31:26+00:00
Summary:     Memoize AliasedClass, ClauseAdapter objects in joined eager load

Addressed some long unattended performance concerns within the
joined eager loader query construction system.  The use of ad-hoc
:class:`.AliasedClass` objects per query, which produces lots of column
lookup overhead each time, has been replaced with a cached approach
that makes use of a small pool of :class:`.AliasedClass` objects
that are reused between invocations of joined eager loading.
Callcount reduction of SQL query generation for worst-case joined
loader scenarios (lots of joins, lots of columns) is reduced by
approximately 270%.

Change-Id: Ie43beecf37945b2bb7fff0aaa597a597293daa18
Fixes: #3915

Affected #:  5 files

https://bitbucket.org/zzzeek/sqlalchemy/commits/4c5cfa8bc6cc/
Changeset:   4c5cfa8bc6cc
Branch:      master
User:        zzzeek
Date:        2017-02-22 22:16:28+00:00
Summary:     Merge "Memoize AliasedClass, ClauseAdapter objects in joined eager load"
Affected #:  5 files

Repository URL: https://bitbucket.org/zzzeek/sqlalchemy/

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