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https://issues.apache.org/jira/browse/CALCITE-5827?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17741801#comment-17741801
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Julian Hyde commented on CALCITE-5827:
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We can't mark this 'done' until infinity and NaN are supported DOUBLE values.
Can you investigate related cases CALCITE-2067 and CALCITE-4589? Maybe they are
fixed. If so, please add test cases for them to the PR.
If you pass a REAL (32-bit floating point) value to these functions, the result
should be the same as for a 64 bit infinity or nan. Add tests accordingly.
> Add IS_INF and IS_NAN functions (enabled in BigQuery library)
> -------------------------------------------------------------
>
> Key: CALCITE-5827
> URL: https://issues.apache.org/jira/browse/CALCITE-5827
> Project: Calcite
> Issue Type: New Feature
> Reporter: Tanner Clary
> Assignee: Tanner Clary
> Priority: Major
> Labels: pull-request-available
>
> BigQuery offers the
> [IS_INF|https://cloud.google.com/bigquery/docs/reference/standard-sql/mathematical_functions#is_inf]
> and
> [IS_NAN|https://cloud.google.com/bigquery/docs/reference/standard-sql/mathematical_functions#is_nan]
> functions. The first returns whether the specified value is infinite, the
> second returns whether the specified value is {{NaN}}.
> Example 1: {{SELECT IS_INF(3)}} would return {{FALSE}}.
> Example 2: {{SELECT IS_INF(CAST('Infinity` AS DOUBLE))}} would return
> {{TRUE}}.
> Example 3: {{SELECT IS_NAN(3)}} would return {{FALSE}}.
> Example 4: {{SELECT IS_INF(CAST('NaN' AS DOUBLE))}} would return {{TRUE}}.
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