public static void main(String[] args) {
PlanFactory f = getInstance();
// DAU
// SELECT COUNT(DISTINCT(uid))
// FROM event NATURAL JOIN user
// WHERE user.register_time='2013-02-01'
// AND event.date='2013-02-02' and event.event='visit'
f.newGroup()
.setInput(
f.newDistinct()
.setInput(
f.newJoin()
.setInput(
f.newSelection()
.setInput(
f.newTableScan("user"),
new Equals(
new ColumnValue("register_time"),
new Constant("2013-02-01"))),
f.newSelection()
.setInput(
f.newTableScan("event"),
new And(
new Equals(
new ColumnValue("date"), new Constant("2013-02-02")),
new Equals(
new ColumnValue("event"), new Constant("visit"))))),
new ColumnValue("uid")),
null,
null);
}
@Override
public void visit(SubJoin subJoin) {
FromItem left = subJoin.getLeft();
FromItem right = subJoin.getJoin().getRightItem();
FromItemVisitorImpl leftVisitor = new FromItemVisitorImpl(where);
FromItemVisitorImpl rightVisitor = new FromItemVisitorImpl(where);
left.accept(leftVisitor);
right.accept(rightVisitor);
relationProvider = PlanFactory.getInstance().newJoin();
((Join) relationProvider)
.setInput(leftVisitor.getRelationProvider(), rightVisitor.getRelationProvider());
}
@Override
public void visit(Table table) {
TableScan tableScan = PlanFactory.getInstance().newTableScan(table.getName());
relationProvider = PlanFactory.getInstance().newSelection();
((Selection) relationProvider).setInput(tableScan, getWhere(tableScan));
}