vlsi commented on a change in pull request #2595:
URL: https://github.com/apache/calcite/pull/2595#discussion_r753655898
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File path: core/src/test/java/org/apache/calcite/sql/type/SqlTypeUtilTest.java
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@@ -226,4 +227,29 @@ private void compareTypesIgnoringNullability(
compareTypesIgnoringNullability("identical types should return true.",
bigIntType, bigIntType1, true);
}
+
+ @Test public void testCanAlwaysCastToUnknownFromBasic() {
+ RelDataType unknownType = f.typeFactory.createUnknownType();
+ RelDataType nullableUnknownType =
f.typeFactory.createTypeWithNullability(unknownType, true);
+
+ for (SqlTypeName fromTypeName : SqlTypeName.values()) {
+ BasicSqlType fromType;
+ try {
+ // This only works for basic types. Ignore the rest.
+ fromType = (BasicSqlType) f.typeFactory.createSqlType(fromTypeName);
+ } catch (AssertionError e) {
+ continue;
+ }
+ BasicSqlType nullableFromType =
fromType.createWithNullability(!fromType.isNullable);
+
+ assertTrue(SqlTypeUtil.canCastFrom(unknownType, fromType, false));
Review comment:
I would rather suggest refactoring the test into `@ParameterizedTest` or
creating a small `assertCanCastFrom(...)`, so the code becomes less noisy, and
`assertCanCastFrom` could have clarification messages that explain which case
failed (what was the input)
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