zeripath 428d58f8da Restore compatibility with SQLServer 2008 R2 in migrations (#16638) ...

This fixes two problems with MSSQL:

* `ALTER TABLE DROP ... IF EXISTS ...` is only supported in SQL Server >16.

The `IF EXISTS` here is a belt-and-braces and does not need to be present. Therefore
can be dropped. Also stop attempting to drop the indexes as constraints as they're indexes!

* System tables like: `sys.indexes` should be lowercase not uppercase because of collation issues.

Fix #13615

Signed-off-by: Andrew Thornton <art27@cantab.net>

Co-authored-by: Lunny Xiao <xiaolunwen@gmail.com>

2021-08-08 13:32:07 +03:00

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