Benchao Li created FLINK-15266:
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Summary: NPE in blink planner code gen
Key: FLINK-15266
URL: https://issues.apache.org/jira/browse/FLINK-15266
Project: Flink
Issue Type: Bug
Components: Table SQL / Runtime
Affects Versions: 1.9.1
Reporter: Benchao Li
`cast` function in blink planner and old planner are different:
in legacy planner:
cast('' as int) -> throw NumberFormatException
cast(null as int) -> throw NullPointerException
cast('abc' as int) -> throw NumberFormatException
but in blink planner:
cast('' as int) -> return null
cast(null as int) -> return null
cast('abc' as int) -> return null
A step forward:
```
create table source {
age int,
id varchar
};
select case when age < 20 then cast(id as bigint) else 0 end from source;
```
queries like above will throw NPE because we will try assign a `null` to a
`long` field.
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