[ 
https://issues.apache.org/jira/browse/FLINK-32969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Lyn Zhang updated FLINK-32969:
------------------------------
    Description: 
If Function will cause NullPointException when the third param is other 
function.
h1. Example:
{code:java}
CREATE TABLE source (
    name    STRING ,
    score   INT
) WITH (
  'connector' = 'socket',
  'hostname' = 'localhost:9999',
  'port' = '9999',
  'byte-delimiter' = '10',
  'format' = 'json'
);

CREATE TABLE print(
  name  STRING,
  score INT
) WITH ('connector' = 'print');

INSERT INTO print
SELECT IF(name = 'aa', 'null', CONCAT(name,'x')),score
FROM source;{code}
–- \{"name":"aa","score":10}

 
h1. Code Generator Result

[^if_function_codegen.java]

!image-2023-08-28-10-55-26-228.png!

  was:
If Functions will cause NullPointException when the third param is other 
function.
h1. Example:
{code:java}
CREATE TABLE source (
    name    STRING ,
    score   INT
) WITH (
  'connector' = 'socket',
  'hostname' = 'localhost:9999',
  'port' = '9999',
  'byte-delimiter' = '10',
  'format' = 'json'
);

CREATE TABLE print(
  name  STRING,
  score INT
) WITH ('connector' = 'print');

INSERT INTO print
SELECT IF(name = 'aa', 'null', CONCAT(name,'x')),score
FROM source;{code}
–- \{"name":"aa","score":10}

 
h1. Code Generator Result

[^if_function_codegen.java]

!image-2023-08-28-10-55-26-228.png!


> IfCallGen NullPointException Bug
> --------------------------------
>
>                 Key: FLINK-32969
>                 URL: https://issues.apache.org/jira/browse/FLINK-32969
>             Project: Flink
>          Issue Type: Bug
>          Components: Table SQL / Planner
>    Affects Versions: 1.17.1
>            Reporter: Lyn Zhang
>            Priority: Major
>         Attachments: if_function_codegen.java, 
> image-2023-08-28-10-55-26-228.png
>
>
> If Function will cause NullPointException when the third param is other 
> function.
> h1. Example:
> {code:java}
> CREATE TABLE source (
>     name    STRING ,
>     score   INT
> ) WITH (
>   'connector' = 'socket',
>   'hostname' = 'localhost:9999',
>   'port' = '9999',
>   'byte-delimiter' = '10',
>   'format' = 'json'
> );
> CREATE TABLE print(
>   name  STRING,
>   score INT
> ) WITH ('connector' = 'print');
> INSERT INTO print
> SELECT IF(name = 'aa', 'null', CONCAT(name,'x')),score
> FROM source;{code}
> –- \{"name":"aa","score":10}
>  
> h1. Code Generator Result
> [^if_function_codegen.java]
> !image-2023-08-28-10-55-26-228.png!



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