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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 maximum Y coordinate of the input GEOMETRY value, or NULL if the geometry is empty.
Syntax
st_ymax ( geoExpr )
Arguments
geoExpr: AGEOMETRYvalue.
Returns
A value of type DOUBLE, equal to the maximum Y coordinate of the input GEOMETRY value.
The function returns NULL if the input is NULL or if the geometry is empty.
Examples
-- Returns the maximum Y coordinate of a non-empty geometry.
> SELECT st_ymax(st_geomfromtext('LINESTRING(10 34,44 57,30 24)'));
57.0
-- Returns `NULL` for an empty geometry.
> SELECT st_ymax(st_geomfromtext('POLYGON EMPTY'));
NULL