fix for bug ID 2864313 SQL: Update changes all columns with same type and default
fix for bug ID 2864313
SQL: Update changes all columns with same type and default

A single bat was used for multiple columns.
We now make sure we copy the bat when its already used.

zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb,zyzyis/monetdb