make implementation with pow() default

Author: bastienboutonnet

macros/geo/haversine_distance.sql

@@ -14,20 +14,6 @@ The arguments should be float type.
 {# vanilla macro is in miles #}
     {% set conversion_rate = '' %}
 {% if unit == 'km' %}
-{# we multiply miles result to get it in kms #}
-    {% set conversion_rate = '* 1.60934' %}
-{% endif %}
-
-    2 * 3961 * asin(sqrt((sin(radians(({{lat2}} - {{lat1}}) / 2))) ^ 2 +
-    cos(radians({{lat1}})) * cos(radians({{lat2}})) *
-    (sin(radians(({{lon2}} - {{lon1}}) / 2))) ^ 2)) {{conversion_rate}}
-
-{%- endmacro %}
-
-{% macro snowflake__haversine_distance(lat1,lon1,lat2,lon2,unit) -%}
-{# vanilla macro is in miles #}
-    {% set conversion_rate = '' %}
-{% if unit == 'km' %}
 {# we multiply miles result to get it in kms #}
     {% set conversion_rate = '* 1.60934' %}
 {% endif %}