diff options
Diffstat (limited to 'lib/sqlalchemy/engine/create.py')
| -rw-r--r-- | lib/sqlalchemy/engine/create.py | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/lib/sqlalchemy/engine/create.py b/lib/sqlalchemy/engine/create.py index 58fe91c7e..5198c8cd6 100644 --- a/lib/sqlalchemy/engine/create.py +++ b/lib/sqlalchemy/engine/create.py @@ -13,6 +13,7 @@ from .. import event from .. import exc from .. import pool as poollib from .. import util +from ..sql import compiler @util.deprecated_params( @@ -142,6 +143,16 @@ def create_engine(url, **kwargs): :param empty_in_strategy: No longer used; SQLAlchemy now uses "empty set" behavior for IN in all cases. + :param enable_from_linting: defaults to True. Will emit a warning + if a given SELECT statement is found to have un-linked FROM elements + which would cause a cartesian product. + + .. versionadded:: 1.4 + + .. seealso:: + + :ref:`change_4737` + :param encoding: Defaults to ``utf-8``. This is the string encoding used by SQLAlchemy for string encode/decode operations which occur within SQLAlchemy, **outside of @@ -446,6 +457,11 @@ def create_engine(url, **kwargs): dialect_args["dbapi"] = dbapi + dialect_args.setdefault("compiler_linting", compiler.NO_LINTING) + enable_from_linting = kwargs.pop("enable_from_linting", True) + if enable_from_linting: + dialect_args["compiler_linting"] ^= compiler.COLLECT_CARTESIAN_PRODUCTS + for plugin in plugins: plugin.handle_dialect_kwargs(dialect_cls, dialect_args) |