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https://issues.apache.org/jira/browse/CALCITE-5708?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17724354#comment-17724354
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Evgeny Stanilovsky commented on CALCITE-5708:
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It`s work due to type coercion in your case.
> Change SUBSTRING result if either of parameters is NULL
> -------------------------------------------------------
>
> Key: CALCITE-5708
> URL: https://issues.apache.org/jira/browse/CALCITE-5708
> Project: Calcite
> Issue Type: Bug
> Components: core
> Affects Versions: 1.34.0
> Reporter: Evgeny Stanilovsky
> Assignee: Evgeny Stanilovsky
> Priority: Major
> Labels: patch-available
>
> According to standard:
> {noformat}
> 6.18 <string value function>
> ...
> 3)If <character substring function> is specified, then:
> ...
> c) If either C, S, or L is the null value, then the result of the <character
> substring function> is
> the null value.
> {noformat}
> calcite not follow this rule for now.
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