/** Extract a minimal set of WindowGroups from analyticExprs. */
private List<WindowGroup> collectWindowGroups() {
List<Expr> analyticExprs = analyticInfo_.getAnalyticExprs();
List<WindowGroup> groups = Lists.newArrayList();
for (int i = 0; i < analyticExprs.size(); ++i) {
AnalyticExpr analyticExpr = (AnalyticExpr) analyticExprs.get(i);
// Do not generate the plan for non-materialized analytic exprs.
if (!analyticInfo_.getOutputTupleDesc().getSlots().get(i).isMaterialized()) {
continue;
}
boolean match = false;
for (WindowGroup group : groups) {
if (group.isCompatible(analyticExpr)) {
group.add(
(AnalyticExpr) analyticInfo_.getAnalyticExprs().get(i),
analyticInfo_.getOutputTupleDesc().getSlots().get(i),
analyticInfo_.getIntermediateTupleDesc().getSlots().get(i));
match = true;
break;
}
}
if (!match) {
groups.add(
new WindowGroup(
(AnalyticExpr) analyticInfo_.getAnalyticExprs().get(i),
analyticInfo_.getOutputTupleDesc().getSlots().get(i),
analyticInfo_.getIntermediateTupleDesc().getSlots().get(i)));
}
}
return groups;
}
