[bug] [operations] Fixed issue where using Operations.create_table() in conjunction
with a CheckConstraint that referred to table-bound
Column objects rather than string expressions would be added to
the parent table potentially multiple times, resulting in an incorrect DDL
sequence. Pull request courtesy Nicolas CANIART.
[bug] [environment] The logging.fileConfig() line in env.py templates, which is used
to setup Python logging for the migration run, is now conditional on
Config.config_file_name not being None. Otherwise, the line
is skipped as there is no default logging configuration present.
[bug] [mssql] Fixed bug where an Operations.alter_column() operation would change
a "NOT NULL" column to "NULL" by emitting an ALTER COLUMN statement that
did not specify "NOT NULL". (In the absence of "NOT NULL" T-SQL was
implicitly assuming "NULL"). An Operations.alter_column() operation
that specifies Operations.alter_column.type should also
specify include either Operations.alter_column.nullable or
Operations.alter_column.existing_nullable to inform Alembic as
to whether the emitted DDL should include "NULL" or "NOT NULL"; a warning
is now emitted if this is missing under this scenario.
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Bumps alembic from 1.7.6 to 1.7.7.
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