[jira] [Created] (TRAFODION-2611) Input parameters and current functions in input tables of TMUDFs

["Hans Zeller (JIRA)" <ji...@apache.org>]

Hans Zeller created TRAFODION-2611:
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             Summary: Input parameters and current functions in input tables of TMUDFs
                 Key: TRAFODION-2611
                 URL: https://issues.apache.org/jira/browse/TRAFODION-2611
             Project: Apache Trafodion
          Issue Type: Bug
    Affects Versions: 2.0-incubating
         Environment: any
            Reporter: Hans Zeller
            Assignee: Hans Zeller
             Fix For: 2.2-incubating
         Attachments: EchoUdf.cpp

When the input of a table-mapping UDF (TMUDF) contains a parameter or a function that should be evaluated only once, such as current_timestamp, we do not always set up the correct data flow. This is visible, for example, when using a parallel UDF query that has "current_timestamp" as an input:

{noformat}
control query shape esp_exchange(cut,4);
select * from udf(echo(table(select current_timestamp from tsrc <<+cardinality 1e9>>)));
execute s;
{noformat}

This query could return different timestamps, which is wrong, all rows should have the same timestamp.



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