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https://issues.apache.org/jira/browse/FLINK-10049?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16569014#comment-16569014
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vinoyang commented on FLINK-10049:
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[~xccui] Agree! It seems for some string functions, if passing parameter which
is NULL, the function's logic would not be invoked, the table framework would
returns NULL directly.
> Unify the processing logic for NULL arguments in SQL built-in functions
> -----------------------------------------------------------------------
>
> Key: FLINK-10049
> URL: https://issues.apache.org/jira/browse/FLINK-10049
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Xingcan Cui
> Priority: Major
>
> Currently, the built-in functions treat NULL arguments in different ways.
> E.g., ABS(NULL) returns NULL, while LOG10(NULL) throws an NPE. The general
> SQL-way of handling NULL values should be that if one argument is NULL the
> result is NULL. We should unify the processing logic for that.
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