[jira] [Updated] (FLINK-15266) NPE in blink planner code gen

["Benchao Li (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-15266?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benchao Li updated FLINK-15266:
-------------------------------
    Description: 
`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 when the input satisfy `age < 20`.

  was:
`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.


> 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
>            Priority: Major
>
> `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 when the input satisfy `age < 20`.



--
This message was sent by Atlassian Jira
(v8.3.4#803005)