mihaibudiu commented on code in PR #3480:
URL: https://github.com/apache/calcite/pull/3480#discussion_r1370476759
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core/src/test/java/org/apache/calcite/test/enumerable/EnumerableRepeatUnionTest.java:
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@@ -45,6 +45,17 @@
*/
class EnumerableRepeatUnionTest {
+ @Test void testGenerateNumbersUsingSql() {
+ CalciteAssert.that()
+ .query("WITH RECURSIVE delta(n) AS (\n"
+ + " VALUES (1)\n"
+ + " UNION ALL\n"
Review Comment:
The `WHERE` breaks the growth in the value of n, but UNION would break the
growth in cardinality.
UNION ALL should produce a multiset, so you should get the following values
in `delta` in successive iterations: [1], [1, 2], [1, 2, 2, 3], [1, 2, 2, 2, 3,
3, 4] etc in your relation in successive iterations. I understand how this
should work with `UNION`, but not with `UNION ALL`. Why is delta a set and not
a multiset?
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