[ms] #1382452: incorrect results with multi-sources when some relation is crossed among sources with non-invariant variables, we've to introduce an intermediary steps to fetch all relations from all sources, then make the join with intermediary tables containing possible variables values.

+
−[system]
+
−db-driver   = sqlite
+
−adapter     = native
+
−db-name     = tmpdb-multi
+
−db-encoding = UTF-8