[jira] [Updated] (IMPALA-8664) Inconsistent result by integer multiply NULL

["Tim Armstrong (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-8664?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Armstrong updated IMPALA-8664:
----------------------------------
    Component/s: Frontend

> Inconsistent result by integer multiply NULL
> --------------------------------------------
>
>                 Key: IMPALA-8664
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8664
>             Project: IMPALA
>          Issue Type: Bug
>          Components: Frontend
>    Affects Versions: Impala 2.11.0
>            Reporter: Hajime Osako
>            Priority: Major
>
> h3. A: "SELECT 1 * (NULL)" and "SELECT 1 * (CASE ...)" returns different result:
> Expected result "null":
> {code:sql}
> 0: jdbc:hive2://test> SELECT 1 * (NULL);
> null
> {code}
> The CASE part returns NULL, so expected same as above, but actually Exception:
> {code:sql}
> 0: jdbc:hive2://test> select 1 * (CASE WHEN '1' IS NULL THEN NULL ELSE NULL END);
> Error: AnalysisException: Arithmetic operation requires numeric operands: 1 * (CASE WHEN '1' IS NULL THEN NULL ELSE NULL END) (state=HY000,code=0)
> {code}
> h3. B: Using aggregation in CASE or without returns different result:
> As per A, below query failing is kind of understandable:
> {code:sql}
> 0: jdbc:hive2://test> SELECT (-1 * CASE WHEN SUM(1) IS NULL THEN NULL WHEN COALESCE(NULL, 0) = 0 THEN NULL ELSE 0 END) FROM (SELECT 1 as col1, 2 as col2) dummy_t;
> Error: AnalysisException: Arithmetic operation requires numeric operands: (-1 * CASE WHEN sum(1) IS NULL THEN NULL ELSE NULL END) (state=HY000,code=0)
> {code}
> But, removing SUM returns different result (no exception...):
> {code:sql}
> 0: jdbc:hive2://test> SELECT (-1 * CASE WHEN COALESCE(NULL, 0) = 0 THEN NULL ELSE 0 END) FROM (SELECT 1 as col1, 2 as col2) dummy_t;
> null
> {code}



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