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Applies to: 
Databricks SQL Databricks Runtime 17.1 and above
Important
This feature is in Public Preview.
Note
This feature is not available on Databricks SQL Classic warehouses. To learn more about Databricks SQL warehouses, see SQL warehouse types.
Returns the number of non-empty points in the input GEOGRAPHY or GEOMETRY value.
Syntax
st_npoints ( geoExpr )
Arguments
geoExpr: AGEOGRAPHYorGEOMETRYvalue.
Returns
A value of type INT, representing the number of non-empty points in the input GEOGRAPHY or GEOMETRY value.
The function returns NULL if the input is NULL.
Examples
-- Returns the number of points in a non-empty multipoint geometry.
> SELECT st_npoints(st_geomfromtext('MULTIPOINT(10 34,44 57,EMPTY)'));
2
-- Returns the number of points in an empty multipoint geometry.
> SELECT st_npoints(st_geomfromtext('MULTIPOINT(EMPTY,EMPTY)'));
0
-- Returns the number of points in a non-empty polygon geometry.
> SELECT st_npoints(st_geomfromtext('POLYGON((0 0,1 0,1 1,0 1,0 0))'));
5