dbt-postgres 'microbatch' strategy (#146)

.changes/unreleased/Features-20240911-141416.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: 'Microbatch incremental strategy implementation: merge'
+time: 2024-09-11T14:14:16.538536-04:00
+custom:
+  Author: michelleark
+  Issue: "149"

dbt/adapters/postgres/impl.py

@@ -151,7 +151,7 @@ def valid_incremental_strategies(self):
         """The set of standard builtin strategies which this adapter supports out-of-the-box.
         Not used to validate custom strategies defined by end users.
         """
-        return ["append", "delete+insert", "merge"]
+        return ["append", "delete+insert", "merge", "microbatch"]
 
     def debug_query(self):
         self.execute("select 1 as id")

dbt/include/postgres/macros/materializations/incremental_strategies.sql

@@ -7,3 +7,14 @@
   {% endif %}
 
 {% endmacro %}
+
+
+{% macro postgres__get_incremental_microbatch_sql(arg_dict) %}
+
+  {% if arg_dict["unique_key"] %}
+    {% do return(adapter.dispatch('get_incremental_merge_sql', 'dbt')(arg_dict)) %}
+  {% else %}
+    {{ exceptions.raise_compiler_error("dbt-postgres 'microbatch' requires a `unique_key` config") }}
+  {% endif %}
+
+{% endmacro %}

tests/functional/adapter/test_incremental_microbatch.py

@@ -0,0 +1,7 @@
+from dbt.tests.adapter.incremental.test_incremental_microbatch import (
+    BaseMicrobatch,
+)
+
+
+class TestPostgresMicrobatch(BaseMicrobatch):
+    pass