Update function materialization related macros to use default__ naming scheme (#1357)

Author: QMalcolm

dbt-adapters/.changes/unreleased/Fixes-20250926-152757.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Update function related global macros to use `default__` naming scheme
+time: 2025-09-26T15:27:57.488721-05:00
+custom:
+  Author: QMalcolm
+  Issue: "1356"

dbt-adapters/src/dbt/include/global_project/macros/materializations/functions/helpers.sql

@@ -1,4 +1,8 @@
 {% macro function_execute_build_sql(build_sql, existing_relation, target_relation) %}
+    {{ return(adapter.dispatch('function_execute_build_sql', 'dbt')(build_sql, existing_relation, target_relation)) }}
+{% endmacro %}
+
+{% macro default__function_execute_build_sql(build_sql, existing_relation, target_relation) %}
 
     {% set grant_config = config.get('grants') %}
 
@@ -17,7 +21,11 @@
 
 
 {% macro get_function_macro(function_type, function_language) %}
-    {% set macro_name = "get_" ~ function_type ~ "_function_" ~ function_language %}
+    {{ return(adapter.dispatch('get_function_macro', 'dbt')(function_type, function_language)) }}
+{% endmacro %}
+
+{% macro default__get_function_macro(function_type, function_language) %}
+    {% set macro_name = function_type ~ "_function_" ~ function_language %}
     {% if not macro_name in context %}
         {{ exceptions.raise_not_implemented(function_language ~ ' ' ~ function_type ~ ' function not implemented for adapter ' ~adapter.type()) }}
     {% endif %}

dbt-adapters/src/dbt/include/global_project/macros/materializations/functions/scalar.sql

@@ -1,21 +1,37 @@
-{% macro get_scalar_function_sql(target_relation) %}
-    {{ get_scalar_function_create_replace_signature(target_relation) }}
-    {{ get_scalar_function_body() }};
+{% macro scalar_function_sql(target_relation) %}
+    {{ return(adapter.dispatch('scalar_function_sql', 'dbt')(target_relation)) }}
 {% endmacro %}
 
-{% macro get_scalar_function_create_replace_signature(target_relation) %}
-    CREATE OR REPLACE FUNCTION {{ target_relation.render() }} ({{ get_formatted_scalar_function_args()}}) RETURNS {{ model.return_type.type }} AS
+{% macro default__scalar_function_sql(target_relation) %}
+    {{ scalar_function_create_replace_signature_sql(target_relation) }}
+    {{ scalar_function_body_sql() }};
 {% endmacro %}
 
-{% macro get_formatted_scalar_function_args() %}
+{% macro scalar_function_create_replace_signature_sql(target_relation) %}
+    {{ return(adapter.dispatch('scalar_function_create_replace_signature_sql', 'dbt')(target_relation)) }}
+{% endmacro %}
+
+{% macro default__scalar_function_create_replace_signature_sql(target_relation) %}
+    CREATE OR REPLACE FUNCTION {{ target_relation.render() }} ({{ formatted_scalar_function_args_sql()}}) RETURNS {{ model.return_type.type }} AS
+{% endmacro %}
+
+{% macro formatted_scalar_function_args_sql() %}
+    {{ return(adapter.dispatch('formatted_scalar_function_args_sql', 'dbt')()) }}
+{% endmacro %}
+
+{% macro default__formatted_scalar_function_args_sql() %}
     {% set args = [] %}
     {% for arg in model.arguments -%}
         {%- do args.append(arg.name ~ ' ' ~ arg.type) -%}
     {%- endfor %}
     {{ args | join(', ') }}
 {% endmacro %}
 
-{% macro get_scalar_function_body() %}
+{% macro scalar_function_body_sql() %}
+    {{ return(adapter.dispatch('scalar_function_body_sql', 'dbt')()) }}
+{% endmacro %}
+
+{% macro default__scalar_function_body_sql() %}
     $$
        {{ model.compiled_code }}
     $$ LANGUAGE SQL;