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https://issues.apache.org/jira/browse/CALCITE-6663?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17894831#comment-17894831
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xiong duan commented on CALCITE-6663:
-------------------------------------
The official function description about split_part
in：https://www.postgresql.org/docs/17/functions-string.html
> Support SPLIT_PART function for postgresql
> ------------------------------------------
>
> Key: CALCITE-6663
> URL: https://issues.apache.org/jira/browse/CALCITE-6663
> Project: Calcite
> Issue Type: Improvement
> Reporter: Qi Zhu
> Priority: Major
> Labels: pull-request-available
>
> {{We can support split_part function for postgresq:}}
> {{split_part}} ( _{{string}}_ {{{}text{}}}, _{{delimiter}}_ {{{}text{}}},
> _{{n}}_ {{integer}} ) → {{text}}
> Splits _{{string}}_ at occurrences of _{{delimiter}}_ and returns the
> {_}{{n}}{_}'th field (counting from one), or when _{{n}}_ is negative,
> returns the |{_}{{n}}{_}|'th-from-last field.
> {{split_part('abc~@~def~@~ghi', '~@~', 2)}} → {{def}}
> {{split_part('abc,def,ghi,jkl', ',', -2)}} → {{ghi}}
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