Reinitialize vheap in BATclear when force flag given. This stops the vheap growing indefinitely in the SQL context when all values get deleted from a table. Fix suggested by Richard Hughes.
Reinitialize vheap in BATclear when force flag given.
This stops the vheap growing indefinitely in the SQL context when all
values get deleted from a table.
Fix suggested by Richard Hughes.

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