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https://issues.apache.org/jira/browse/CALCITE-4427?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17245523#comment-17245523
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James Starr commented on CALCITE-4427:
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How will substr behave in a pestro like environment, where it could be pushed
down to multiple different DBs or resolved using the pestro implementation?
> 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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