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

["Jark Wu (Jira)" <ji...@apache.org>]

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

Jark Wu resolved FLINK-15266.
-----------------------------
    Resolution: Fixed

1.11.0: 5f86f2d1ae608a4d2259bfcf637d97b490dbd328
1.10.0: 319466af2a63ad28e18481243e3cbb9b39ecc1de
1.9.2: 73c82c3d4d7176b04cb4f8720ed64fdb1c208bf9

> 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
>            Assignee: Benchao Li
>            Priority: Blocker
>              Labels: pull-request-available
>             Fix For: 1.9.2, 1.10.0
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> `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`.



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