jcamachor commented on a change in pull request #1185: [CALCITE-3012]
areColumnsUnique for FULL OUTER JOIN could return wrong answer when ignoreNulls
is false
URL: https://github.com/apache/calcite/pull/1185#discussion_r280569387
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File path: core/src/test/java/org/apache/calcite/test/RelMetadataTest.java
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@@ -925,6 +925,21 @@ private boolean isUnique(Set<ImmutableBitSet> uniqueKeys,
ImmutableBitSet key) {
assertUniqueConsistent(rel);
}
+ @Test public void testFullOuterJoinUniqueness1() {
+ final String sql = "select e.jb, d.nm \n"
+ + "from (select cast(null as int) jb from sales.emp "
+ + " where empno = 10 group by cast(null as int)) as e \n"
+ + "full outer join (select cast (null as int) nm from sales.dept "
+ + "group by cast(null as int)) as d on e.jb = d.nm \n"
+ + "group by e.jb, d.nm";
+ RelNode rel = convertSql(sql);
Review comment:
I see, makes sense. However, it seems comments are not consistent wrt
behavior. Probably there is not a rule that makes a distinction between 'false'
and 'null' right now, so it is fine. Maybe you can create a follow-up (you can
leave it unassigned) so we can discuss and fix it. I will merge this patch
shortly.
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