Rui Li created FLINK-18516:
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Summary: Improve error message for rank function in streaming mode
Key: FLINK-18516
URL: https://issues.apache.org/jira/browse/FLINK-18516
Project: Flink
Issue Type: Improvement
Components: Table SQL / Planner
Reporter: Rui Li
The following query currently fails with NPE:
{code}
create table foo (x int,y string,p as proctime()) with ...;
select x,y,row_number() over (partition by x order by p) from foo;
{code}
which can be difficult for users to figure out the reason of the failure.
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