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From "Josh Mahonin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (PHOENIX-1229) Coalesce on nth_value gives ArrayIndexOutOfBoundsException
Date Tue, 02 Sep 2014 15:57:21 GMT
Josh Mahonin created PHOENIX-1229:
-------------------------------------

             Summary: Coalesce on nth_value gives ArrayIndexOutOfBoundsException
                 Key: PHOENIX-1229
                 URL: https://issues.apache.org/jira/browse/PHOENIX-1229
             Project: Phoenix
          Issue Type: Bug
    Affects Versions: 5.0.0
            Reporter: Josh Mahonin


Running a query with "NTH_VALUE" can result in null values returning, which is expected. When
wrapping the results in a coalesce, a java.lang.ArrayIndexOutOfBoundsException is thrown.

Reproducible test case below:

-- Create table
CREATE TABLE TEST_NTH(
    ID BIGINT NOT NULL, 
    DATE TIMESTAMP NOT NULL, 
    COUNT BIGINT 
    CONSTRAINT pk PRIMARY KEY(ID, DATE));

-- Sample values
UPSERT INTO TEST_NTH(ID, DATE, COUNT) VALUES(1, CURRENT_TIME(), 1);
UPSERT INTO TEST_NTH(ID, DATE, COUNT) VALUES(1, CURRENT_TIME(), 2);

UPSERT INTO TEST_NTH(ID, DATE, COUNT) VALUES(2, CURRENT_TIME(), 1);

-- Select nth, returns null for id 2, OK
SELECT ID, 
       NTH_VALUE(COUNT, 2) 
       WITHIN GROUP (ORDER BY COUNT DESC) 
FROM TEST_NTH 
GROUP BY ID;

-- Using coalesce throws java.lang.ArrayIndexOutOfBoundsException
SELECT ID,
       COALESCE(
            NTH_VALUE(COUNT, 2)
            WITHIN GROUP (ORDER BY COUNT DESC),
       0)
FROM TEST_NTH
GROUP BY id;



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