add --empty flag to dbt build

.changes/unreleased/Features-20240424-180639.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: add --empty flag to dbt build command
+time: 2024-04-24T18:06:39.438457-04:00
+custom:
+  Author: michelleark
+  Issue: "10026"

core/dbt/cli/main.py

@@ -170,6 +170,7 @@ def cli(ctx, **kwargs):
 @cli.command("build")
 @click.pass_context
 @global_flags
+@p.empty
 @p.exclude
 @p.export_saved_queries
 @p.full_refresh

tests/functional/adapter/empty/test_empty.py → tests/functional/test_empty.py

@@ -37,7 +37,7 @@
 """
 
 
-class BaseTestEmpty:
+class TestEmptyFlag:
     @pytest.fixture(scope="class")
     def seeds(self):
         return {
@@ -70,6 +70,13 @@ def test_run_with_empty(self, project):
         run_dbt(["run", "--empty"])
         self.assert_row_count(project, "model", 0)
 
+        # build without empty - 3 expected rows in output - 1 from each input
+        run_dbt(["build"])
+        self.assert_row_count(project, "model", 3)
+
+        # build with empty - 0 expected rows in output
+        run_dbt(["build", "--empty"])
+        self.assert_row_count(project, "model", 0)
 
-class TestEmpty(BaseTestEmpty):
-    pass
+        # ensure dbt compile supports --empty flag
+        run_dbt(["compile", "--empty"])