(minor?) clean-up and improvement of PROC multi_merged_union(): use onl N-1 (instead of N) merged_union() iterations to merge N tables
(minor?) clean-up and improvement of PROC multi_merged_union():
use onl N-1 (instead of N) merged_union() iterations to merge N tables

(C version of multi_merged_union() will come "soon" ...)

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