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https://issues.apache.org/jira/browse/FLINK-21856?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Huang Xingbo closed FLINK-21856.
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Resolution: Fixed
> Fix the bug of using Python UDF from sub-query as input param of Python UDTF
> ----------------------------------------------------------------------------
>
> Key: FLINK-21856
> URL: https://issues.apache.org/jira/browse/FLINK-21856
> Project: Flink
> Issue Type: Bug
> Components: API / Python
> Affects Versions: 1.11.3, 1.12.2, 1.13.0
> Reporter: Huang Xingbo
> Priority: Minor
> Labels: auto-deprioritized-major
>
> This example comes from the user. splitStr is a Python UDTF.
> train_and_predict is a Python UDF.
> {code:python}
> t_env.sql_query("""
> select A.hotime ,
> A.before_ta ,
> A.before_rssi ,
> A.after_ta ,
> A.after_rssil ,
> A.nb_tath ,
> A.nb_rssith ,
> nbr_rssi ,
> nbr_ta
> from (SELECT
> hotime ,
> before_ta ,
> before_rssi ,
> after_ta ,
> after_rssil ,
> nb_tath ,
> nb_rssith ,
> train_and_predict(nb_tath, nb_rssith) predict
> FROM
> source) as A,LATERAL TABLE(splitStr(predict)) as T(nbr_rssi, nbr_ta)
> """)
> {code}
> The root cause is that `train_and_predict` is a RexCorrelVariable which we
> don't have relevant logic to deal with.
> A workaround is to use the Table API.
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