TongMeng created FLINK-25332:
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             Summary: When using Pyflink Table API, 'where' clause seems to 
work incorrectly
                 Key: FLINK-25332
                 URL: https://issues.apache.org/jira/browse/FLINK-25332
             Project: Flink
          Issue Type: Bug
          Components: Table SQL / API
    Affects Versions: 1.13.0
         Environment: Python 3.6.9, Pyflink 1.13.0, kafka2.12-2.4.0
            Reporter: TongMeng


The UDF I used just returns a float, the first four data it returns 1.0, 2.0, 
3.0 and 4.0, then it returns 0.0. I use 'where' in the sql to filter the 0.0 
result. So the expected result I want to see in the kafka should be 1.0, 2.0, 
3.0 and 4.0. However kafka consumer gives four 0.0.

The sql is as follow:

"insert into algorithmsink select dt.my_result from(select udf1(a) AS my_result 
from mysource) AS dt where dt.my_result > 0.0"

After I  removed the 'where dt.my_result > 0.0' part, it workd well. Kafka gave 
1.0, 2.0, 3.0, 4.0, 0.0, 0.0, 0.0……



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