DISTINCTCOUNTBITMAPMV

This section contains reference documentation for the DISTINCTCOUNTBITMAPMV function.

Returns the count of distinct row values in a group. This function is accurate for INT or dictionary encoded column, but approximate for other cases where hash codes are used in distinct counting and there may be hash collision.

Signature

DISTINCTCOUNTBITMAPMV(colName)

Usage Examples

These examples are based on the Hybrid Quick Start.

select DISTINCTCOUNTBITMAPMV(DivLongestGTimes) AS value
from airlineStats 
where arraylength(DivLongestGTimes) > 1

value
34

select DISTINCTCOUNTBITMAPMV(DivTailNums) AS value
from airlineStats 
where arraylength(DivTailNums) > 1

value
2