Huang Xingbo created FLINK-21856:
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Summary: 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: 1.12.2, 1.11.3, 1.13.0
Reporter: Huang Xingbo
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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