From a647364c4c7cb063063e73301f16bc1a5e84f170 Mon Sep 17 00:00:00 2001
From: Lucas Ortiz <lucas.l.ortiz@gmail.com>
Date: Mon, 21 Aug 2023 11:03:26 +0200
Subject: [PATCH] add dbt_utils/sqlserver__generate_surrogate_key macro to fix
 concat bug #97

---
 .../dbt_utils/sql/generate_surrogate_key.sql  | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 macros/dbt_utils/sql/generate_surrogate_key.sql

diff --git a/macros/dbt_utils/sql/generate_surrogate_key.sql b/macros/dbt_utils/sql/generate_surrogate_key.sql
new file mode 100644
index 0000000..da31f58
--- /dev/null
+++ b/macros/dbt_utils/sql/generate_surrogate_key.sql
@@ -0,0 +1,29 @@
+{%- macro sqlserver__generate_surrogate_key(field_list) -%}
+
+{%- if var('surrogate_key_treat_nulls_as_empty_strings', False) -%}
+    {%- set default_null_value = "" -%}
+{%- else -%}
+    {%- set default_null_value = '_dbt_utils_surrogate_key_null_' -%}
+{%- endif -%}
+
+{%- set fields = [] -%}
+
+{%- for field in field_list -%}
+
+    {%- do fields.append(
+        "coalesce(cast(" ~ field ~ " as " ~ dbt.type_string() ~ "), '" ~ default_null_value  ~"')"
+    ) -%}
+
+    {%- if not loop.last %}
+        {%- do fields.append("'-'") -%}
+    {%- endif -%}
+
+{%- endfor -%}
+
+{%- if fields|length > 1 %}
+    {{ dbt.hash(dbt.concat(fields)) }}
+{%- else -%}
+    {{ dbt.hash(fields[0]) }}
+{%- endif -%}
+
+{%- endmacro -%}