AliasedExpr aliasExpr = mAggregateExprs.get(i);
Expr expr = aliasExpr.getExpr();
assert expr instanceof FnCallExpr;
FnCallExpr fnCall = (FnCallExpr) expr;
Bucket bucket = buckets.get(i);
fnCall.insertAggregate(e, bucket);
}
// Insert a callback into a queue to allow time to expire these windows.
enqueueWakeup(curBucketTime);
}