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https://issues.apache.org/jira/browse/TRAFODION-2611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16005395#comment-16005395
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Hans Zeller commented on TRAFODION-2611:
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The bug is in TableMappingUDF::recomputeOuterReferences(). The outputs of the
child query (including current_timestamp in this example) are stored in the
TableMappingUDF node. It must add any outer references from these expressions
to its own characteristic inputs.
> 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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