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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