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https://issues.apache.org/jira/browse/FLINK-21162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17288139#comment-17288139
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Jark Wu commented on FLINK-21162:
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Yes. I think {{null IN (...)}} should return unknown, and unkown is false by
default.
> FLINK SQL IF function semantic incorrect
> ----------------------------------------
>
> Key: FLINK-21162
> URL: https://issues.apache.org/jira/browse/FLINK-21162
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API, Table SQL / Planner, Table SQL / Runtime
> Affects Versions: 1.12.1
> Reporter: 谢波
> Assignee: WeiNan Zhao
> Priority: Major
> Labels: pull-request-available
>
> I have a job using IF() test condition.
> when i use "IF(col = '', 'a', 'b'), WHEN col = '' return a ", it is ok.
> when i use "IF(col IS NULL, 'a', 'b'), WHEN col = NULL return a ", it is ok.
> when i use "IF(col = '' OR col IS NULL, 'a', 'b'),WHEN col = ''return a", it
> is ok.
> when i use "IF(col = '' OR col IS NULL, 'a', 'b'),WHEN col = NULL return b"
> ,that's amazing.
> The semantic seems like inccorrect.
>
> my table ddl:
> CREATE TABLE print(a STRING, b STRING) WITH ( 'connector' = 'print' );
> my dml :
> INSERT INTO print
> SELECT return_flag,
> IF(return_flag = '' OR return_flag IS NULL, 'N', 'Y') returnFlag
> FROM header;
> my test data:
> 3> +I(,N)
> 5> +I(X,Y)
> 1> +I(null,Y)
> 2> +I(,N)
> 5> +I(null,Y)
> 3> +I(,N)
>
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