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https://issues.apache.org/jira/browse/CALCITE-6549?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17881682#comment-17881682
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Julian Hyde commented on CALCITE-6549:
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Note that, consistent with Spark, {{log1p(-1)}} returns {{NULL}}.
> Add LOG1P function (enabled in Spark library)
> ---------------------------------------------
>
> Key: CALCITE-6549
> URL: https://issues.apache.org/jira/browse/CALCITE-6549
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.37.0
> Reporter: Caican Cai
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.38.0
>
>
> Returns log(1 + `expr`).
> https://spark.apache.org/docs/3.4.0/sql-ref-functions-builtin.html#mathematical-functions
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