Merge pull request #36 from fishtown-analytics/fix/snowflake-no-cols

Create Snowflake external tables with no columns defined

macros/external/create_external_table.sql

@@ -68,7 +68,7 @@
 {# https://docs.snowflake.net/manuals/sql-reference/sql/create-external-table.html #}
 {# This assumes you have already created an external stage #}
     create or replace external table {{source(source_node.source_name, source_node.name)}}
-    {%- if columns|length > 0 or partitions|length > 0 -%}
+    {%- if columns or partitions -%}
     (
         {%- if partitions -%}{%- for partition in partitions %}
             {{partition.name}} {{partition.data_type}} as {{partition.expression}}{{- ',' if columns|length > 0 -}}