11moon11 commented on a change in pull request #1611: [CALCITE-3355] Deduce
whether CASE and COALESCE may produce NULL values
URL: https://github.com/apache/calcite/pull/1611#discussion_r352798781
##########
File path: core/src/test/java/org/apache/calcite/test/SqlValidatorTest.java
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@@ -619,6 +625,9 @@ private static String
cannotStreamResultsForNonStreamingInputs(String inputs) {
expr("coalesce('a','b')").ok();
expr("coalesce('a','b','c')")
.columnType("CHAR(1) NOT NULL");
+
+ sql("select COALESCE(mgr, 12) as m from EMP")
Review comment:
I would also add a test for a query like this: `NULLIF(x, -1)`.
According to the doc [1] it is also converted to `CASE WHEN ...`
[1]
https://calcite.apache.org/apidocs/org/apache/calcite/sql/fun/SqlCaseOperator.html
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