// default to false
boolean mapOnly = false;
boolean rootTask = false;
UnionParseContext parentUCtx =
ctx.getUnionParseContext(parentUnionOperator);
if (parentUCtx != null && parentUCtx.allMapOnlySubQSet()) {
mapOnly = parentUCtx.allMapOnlySubQ();
rootTask = parentUCtx.allRootTasks();
}
uCtx.setMapOnlySubq(pos, mapOnly);