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https://issues.apache.org/jira/browse/CALCITE-3697?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17876378#comment-17876378
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Norman Jordan commented on CALCITE-3697:
----------------------------------------
[~julianhyde] I have updated the description with some examples. The fractional
portion of a decimal value is ignored and only bits in the integer portion are
counted.
> Implement BITCOUNT scalar function
> ----------------------------------
>
> Key: CALCITE-3697
> URL: https://issues.apache.org/jira/browse/CALCITE-3697
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Forward Xu
> Assignee: Forward Xu
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 50m
> Remaining Estimate: 0h
>
> Implement bit_count function
> MySQL BIT_COUNT:
> [https://dev.mysql.com/doc/refman/8.4/en/bit-functions.html#bit-operations-bit-count]
>
> Examples:
>
> ||Expression||Result||
> |bitcount(0)|0|
> |bitcount(1)|1|
> |bitcount(39)|4|
> |bitcount(cast(x'ad') as BINARY(1)))|5|
> |bitcount(-1)|64|
>
>
> MySQL will handle decimal values as unsigned long values. For decimal values,
> only the integer portion is examined.
>
> ||Expression||Result||
> |bit_count(5.23)|2|
> |bit_count(18446744073709551615)|64|
> |bit_count(18446744073709551616)|63|
> |bit_count(18446744073709551617)|63|
> |bit_count(-9223372036854775808)|1|
> |bit_count(-9223372036854775809)|1|
>
>
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