snuyanzin commented on code in PR #4389:
URL: https://github.com/apache/calcite/pull/4389#discussion_r2097244528
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core/src/test/java/org/apache/calcite/test/SqlValidatorTest.java:
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@@ -5238,6 +5238,35 @@ private ImmutableList<ImmutableBitSet>
cube(ImmutableBitSet... sets) {
.fails("Type mismatch in column 1 of UNION");
sql("select ^slacker^ from emp union select name from dept").ok();
+
+ sql("select ^name^ from dept union select name from dept union select
slacker from emp")
+ .withTypeCoercion(false)
+ .fails("Type mismatch in column 1 of UNION");
Review Comment:
yes, because then one of the union will be between `SELECT` and the result
of the `UNION` or other operator.
>Do we need to add two additional union cases?
not sure about this since it doesn't introduce any new behavior
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