[jira] [Created] (IMPALA-9836) Field is passed as null to UDF when used in the 'where' clause

["Volnei (Jira)" <ji...@apache.org>]

Volnei created IMPALA-9836:
------------------------------

             Summary: Field is passed as null to UDF when used in the 'where' clause
                 Key: IMPALA-9836
                 URL: https://issues.apache.org/jira/browse/IMPALA-9836
             Project: IMPALA
          Issue Type: Question
          Components: Backend
    Affects Versions: Impala 2.12.0
         Environment: Cloudera QuickStart 5.16.2

gcc (GCC) 4.4.7 20120313 (Red Hat 4.4.7-23)

impala-2.12.0+cdh5.16.2+0-1.cdh5.16.2.p0.22.el6.x86_64
impala-shell-2.12.0+cdh5.16.2+0-1.cdh5.16.2.p0.22.el6.x86_64
impala-state-store-2.12.0+cdh5.16.2+0-1.cdh5.16.2.p0.22.el6.x86_64
impala-server-2.12.0+cdh5.16.2+0-1.cdh5.16.2.p0.22.el6.x86_64
impala-udf-devel-2.12.0+cdh5.16.2+0-1.cdh5.16.2.p0.22.el6.x86_64
hue-impala-3.9.0+cdh5.16.2+8463-1.cdh5.16.2.p0.26.el6.x86_64
impala-catalog-2.12.0+cdh5.16.2+0-1.cdh5.16.2.p0.22.el6.x86_64
            Reporter: Volnei


Hi,

Is there any known reason that when we code a C++ UDF, the error below happens?
{code:java}
select sum(squid_totalsize_req("squid", slog))
from squidlog
where squid_totalsize_req("squid", slog) < 500;

/IllegalStateException: Failed to evaluate generated predicate: squidlogs.squid_totalsize_req('squid', NULL) < 500.Argument 2 (LOG): Cannot be empty.
{code}

Whenever I use the UDF in the 'where' clause, the field is passed with a null value.

Thanks a lot for the help.



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