rubenada commented on a change in pull request #1020: [CALCITE-2812] Add
algebraic operators to allow expressing recursive queries (Ruben Quesada Lopez)
URL: https://github.com/apache/calcite/pull/1020#discussion_r258412422
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File path: core/src/test/java/org/apache/calcite/test/JdbcTest.java
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@@ -6837,6 +6837,36 @@ public TranslatableTable view(String s) {
}
}
+ public static class HierarchySchema {
+ @Override public String toString() {
+ return "HierarchySchema";
+ }
+
+ public final Employee[] emps = {
+ new Employee(1, 10, "Emp1", 10000, 1000),
+ new Employee(2, 10, "Emp2", 8000, 500),
+ new Employee(3, 10, "Emp3", 7000, null),
+ new Employee(4, 10, "Emp4", 8000, 500),
+ new Employee(5, 10, "Emp5", 7000, null),
+ };
+ public final Department[] depts = {
+ new Department(10, "Dept", Arrays.asList(emps[0], emps[1],
emps[2], emps[3], emps[4]),
+ new Location(-122, 38)),
+ };
+
+ // Emp1
+ // / \
+ // Emp2 Emp4
+ // / \
+ // Emp3 Emp5
+ public final Hierarchy[] hierarchies = {
Review comment:
I think this design has two (small) advantages:
- It can represent more complicated hierarchies, e.g. one employee with more
than one manager (although this is currently not used in the test cases)
- It requires 2 joins (instead of 1) to compute the hierarchy paths, so it
allows us to show a trickier use case of recursive union + transient table scan
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