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From "Chen Feng (Jira)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-5600) case when for INTEGER to UNSIGNED_LONG throws exception
Date Tue, 03 Dec 2019 07:33:00 GMT
Chen Feng created PHOENIX-5600:
----------------------------------

             Summary: case when for INTEGER to UNSIGNED_LONG throws exception
                 Key: PHOENIX-5600
                 URL: https://issues.apache.org/jira/browse/PHOENIX-5600
             Project: Phoenix
          Issue Type: Improvement
            Reporter: Chen Feng


Execute select of case when for casting INTEGER to UNSIGNED_LONG throws exception.

A example is shown as follows

CREATE TABLE IF NOT EXISTS TBL_TEST_CASE_WHEN (A UNSIGNED_LONG NOT NULL, Y FLOAT, Z UNSIGNED_LONG
CONSTRAINT pk PRIMARY KEY (A));
UPSERT INTO TBL_TEST_CASE_WHEN VALUES (1, 1, 1);
UPSERT INTO TBL_TEST_CASE_WHEN VALUES (2, 2, 2);

# this works correctly
SELECT CASE WHEN A = 1 THEN A+9 ELSE A END, CASE WHEN Y > 1 THEN 5.5 ELSE Y END FROM TBL_TEST_CASE_WHEN;

# exception as follows
# Error: ERROR 203 (22005): Type mismatch. Case expressions must have common type: INTEGER
cannot be coerced to UNSIGNED_LONG (state=22005,code=203)
# org.apache.phoenix.schema.TypeMismatchException: ERROR 203 (22005): Type mismatch. Case
expressions must have common type: INTEGER cannot be coerced to UNSIGNED_LONG

SELECT CASE WHEN A = 1 THEN 10 ELSE A END, CASE WHEN Y > 1 THEN 5.5 ELSE Y END FROM TBL_TEST_CASE_WHEN;

 

By checking code of PUnsignedLong.java and PInteger.java, I see such comment in PLong.isCoercibleTo(isCoercibleTo),
it says

// In general, don't allow conversion of LONG to INTEGER. There are times when
// we check isComparableTo for a more relaxed check and then throw a runtime
// exception if we overflow

However, in this example, enable casting a const INTEGER to UNSIGNED_LONG is more comprehensible.



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