rubenada commented on a change in pull request #2413:
URL: https://github.com/apache/calcite/pull/2413#discussion_r630814848



##########
File path: 
core/src/test/java/org/apache/calcite/sql/type/SqlTypeFactoryTest.java
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@@ -83,6 +83,37 @@
     assertThat(leastRestrictive.isNullable(), is(true));
   }
 
+  @Test void testLeastRestrictiveForArrays() {

Review comment:
       Maybe we should add tests where leastRestrictive is not computable, to 
verify it returns the expected result (`null`)




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