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https://issues.apache.org/jira/browse/CALCITE-4427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17245545#comment-17245545
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Julian Hyde commented on CALCITE-4427:
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[~jamesstarr], The desired behavior is that SUBSTR will give the semantics of
database \{{xxx}} based on your connection's {{fun=xxx}} setting.
The JDBC adapter will have to be clever in generating SQL to make sure that
that happens.
> Make SUBSTRING operator comply with ISO standard SQL
> ----------------------------------------------------
>
> Key: CALCITE-4427
> URL: https://issues.apache.org/jira/browse/CALCITE-4427
> Project: Calcite
> Issue Type: Bug
> Reporter: Julian Hyde
> Priority: Major
>
> Make {{SUBSTRING}} operator comply with ISO standard SQL. It currently
> complies with BigQuery standard SQL, which gives different behavior when
> start is negative. See discussion in CALCITE-4408.
> Add an option to get the BigQuery behavior, for those who want it.
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