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| author | Mike Bayer <mike_mp@zzzcomputing.com> | 2017-03-14 12:00:56 -0400 |
|---|---|---|
| committer | Mike Bayer <mike_mp@zzzcomputing.com> | 2017-03-14 17:01:07 -0400 |
| commit | f3b6f4f8da5223fae0a1dd948d4266b2e49e317c (patch) | |
| tree | 9cae69a0b1680161a5e6604371a17b5766c3dc34 /lib/sqlalchemy/engine/result.py | |
| parent | 596e322543df6ff380243c9cb0cf9997252329f6 (diff) | |
| download | sqlalchemy-f3b6f4f8da5223fae0a1dd948d4266b2e49e317c.tar.gz | |
Add "empty in" strategies; default to "static"
The longstanding behavior of the :meth:`.Operators.in_` and
:meth:`.Operators.not_in_` operators emitting a warning when
the right-hand condition is an empty sequence has been revised;
a new flag :paramref:`.create_engine.empty_in_strategy` allows an
empty "IN" expression to generate a simple boolean expression, or
to invoke the previous behavior of dis-equating the expression to
itself, with or without a warning. The default behavior is now
to emit the simple boolean expression, allowing an empty IN to
be evaulated without any performance penalty.
Change-Id: I65cc37f2d7cf65a59bf217136c42fee446929352
Fixes: #3907
Diffstat (limited to 'lib/sqlalchemy/engine/result.py')
0 files changed, 0 insertions, 0 deletions