xiong duan created CALCITE-7030:
-----------------------------------
Summary: Enhance TopologicalOrderIterator to support BOTTOM_UP
Key: CALCITE-7030
URL: https://issues.apache.org/jira/browse/CALCITE-7030
Project: Calcite
Issue Type: Bug
Reporter: xiong duan
Currently , if the BOTTOM_UP approach is adopted, it achieved by reversing the
results of TOP_DOWN.
{code:java}
case BOTTOM_UP:
// TODO jvs 4-Apr-2006: enhance TopologicalOrderIterator
// to support reverse walk.
final List<HepRelVertex> list = new ArrayList<>();
for (HepRelVertex vertex : TopologicalOrderIterator.of(graph)) {
list.add(vertex);
}
Collections.reverse(list);
return list.iterator(); {code}
In this PR, TopologicalOrderIterator will support BOTTOM_UP and TOP_DOWN mode
both.
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