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changelog:
===============================================================================
-[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.
Signed-off-by: Xu Huan <xuhuan.fnst@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Trevor Gamblin <trevor.gamblin@windriver.com>
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