[hooks/syncschema] only call "ALTER TABLE" once when changing a size constraint Until now we would: - remove the old size constraint from the in-memory schema - call update_rdef_column which removes the size restriction from the column's type - add the new constraint object - call update_rdef_column which adds the size restriction back This breaks on SQL Server when the column is involved in an index (e.g. as part of a multi-column unique constraint), because in the intermediate stage the column's type is "nvarchar(max)", which is not indexable. Of course we must still detect the case where a size constraint is really dropped and update the db schema accordingly. Closes #5557633.

     1

# -*- coding: utf-8 -*-

     2

# copyright %(year)s %(author)s, all rights reserved.

     3

# contact %(author-web-site)s -- mailto:%(author-email)s

     4

#

     5

%(long-license)s

     6

"""%(distname)s schema"""