Description
In be/src/exprs/expr-test.cc, some helper functions does not work unexpectedly.
If expr returns NULL, the test should fail because NULL cannot be compared. If we expect NULL as a result, we should use TestIsNull.
TestValue(expr, expr_type, expected_result)
TestValue("cast(null as int)", TYPE_INT, 0);
TestStringValue("cast(null as string)", "NULL");
Please don't forget to add the above cases as unit tests to verify your patch.
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IMPALA-6260 Misleading 'NULL' string literal in expected results of E2E tests
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