feat(dbt): collect table schema metadata using the dagster dbt package

python_modules/libraries/dagster-dbt/dagster_dbt/asset_utils.py

@@ -362,7 +362,7 @@ def default_metadata_from_dbt_resource_props(
     metadata: Dict[str, Any] = {}
     columns = dbt_resource_props.get("columns", {})
     if len(columns) > 0:
-        metadata["table_schema"] = MetadataValue.table_schema(
+        metadata["columns"] = MetadataValue.table_schema(
             TableSchema(
                 columns=[
                     TableColumn(

python_modules/libraries/dagster-dbt/dagster_dbt/core/resources_v2.py

@@ -1,11 +1,13 @@
+import contextlib
+import copy
 import os
 import shutil
 import signal
 import subprocess
 import sys
 import uuid
 from contextlib import suppress
-from dataclasses import dataclass, field
+from dataclasses import InitVar, dataclass, field
 from pathlib import Path
 from typing import (
     Any,
@@ -44,6 +46,7 @@
 
 from ..asset_utils import (
     dagster_name_fn,
+    default_metadata_from_dbt_resource_props,
     get_manifest_and_translator_from_dbt_assets,
 )
 from ..dagster_dbt_translator import (
@@ -80,19 +83,15 @@ class DbtCliEventMessage:
         raw_event (Dict[str, Any]): The raw event dictionary.
             See https://docs.getdbt.com/reference/events-logging#structured-logging for more
             information.
+        event_history_metadata (Dict[str, Any]): A dictionary of metadata about the
+            current event, gathered from previous historical events.
     """
 
     raw_event: Dict[str, Any]
+    event_history_metadata: InitVar[Dict[str, Any]]
 
-    @classmethod
-    def from_log(cls, log: str) -> "DbtCliEventMessage":
-        """Parse an event according to https://docs.getdbt.com/reference/events-logging#structured-logging.
-
-        We assume that the log format is json.
-        """
-        raw_event: Dict[str, Any] = orjson.loads(log)
-
-        return cls(raw_event=raw_event)
+    def __post_init__(self, event_history_metadata: Dict[str, Any]):
+        self._event_history_metadata = event_history_metadata
 
     def __str__(self) -> str:
         return self.raw_event["info"]["msg"]
@@ -147,10 +146,16 @@ def to_default_asset_events(
                 "No dbt manifest was provided. Dagster events for dbt tests will not be created."
             )
 
+        unique_id: str = event_node_info["unique_id"]
+        invocation_id: str = self.raw_event["info"]["invocation_id"]
+        dbt_resource_props = manifest["nodes"][unique_id]
+        default_metadata = {
+            **default_metadata_from_dbt_resource_props(self._event_history_metadata),
+            "unique_id": unique_id,
+            "invocation_id": invocation_id,
+        }
         has_asset_def: bool = bool(context and context.has_assets_def)
 
-        invocation_id: str = self.raw_event["info"]["invocation_id"]
-        unique_id: str = event_node_info["unique_id"]
         node_resource_type: str = event_node_info["resource_type"]
         node_status: str = event_node_info["node_status"]
         node_materialization: str = self.raw_event["data"]["node_info"]["materialized"]
@@ -172,8 +177,7 @@ def to_default_asset_events(
                     value=None,
                     output_name=dagster_name_fn(event_node_info),
                     metadata={
-                        "unique_id": unique_id,
-                        "invocation_id": invocation_id,
+                        **default_metadata,
                         "Execution Duration": duration_seconds,
                         **adapter_response_metadata,
                     },
@@ -185,8 +189,7 @@ def to_default_asset_events(
                 yield AssetMaterialization(
                     asset_key=asset_key,
                     metadata={
-                        "unique_id": unique_id,
-                        "invocation_id": invocation_id,
+                        **default_metadata,
                         "Execution Duration": duration_seconds,
                         **adapter_response_metadata,
                     },
@@ -195,8 +198,7 @@ def to_default_asset_events(
             upstream_unique_ids: List[str] = manifest["parent_map"][unique_id]
             test_resource_props = manifest["nodes"][unique_id]
             metadata = {
-                "unique_id": unique_id,
-                "invocation_id": invocation_id,
+                **default_metadata,
                 "status": node_status,
                 **adapter_response_metadata,
             }
@@ -460,9 +462,21 @@ def stream_raw_events(self) -> Iterator[DbtCliEventMessage]:
         Returns:
             Iterator[DbtCliEventMessage]: An iterator of events from the dbt CLI process.
         """
+        event_history_metadata_by_unique_id: Dict[str, Dict[str, Any]] = {}
+
         for log in self._stdout or self._stream_stdout():
             try:
-                event = DbtCliEventMessage.from_log(log=log)
+                raw_event: Dict[str, Any] = orjson.loads(log)
+                unique_id: Optional[str] = raw_event["data"].get("node_info", {}).get("unique_id")
+                event_history_metadata: Dict[str, Any] = {}
+                if unique_id and raw_event["info"]["name"] == "NodeFinished":
+                    event_history_metadata = copy.deepcopy(
+                        event_history_metadata_by_unique_id.get(unique_id, {})
+                    )
+
+                event = DbtCliEventMessage(
+                    raw_event=raw_event, event_history_metadata=event_history_metadata
+                )
 
                 is_error_message = event.log_level == "error"
                 is_debug_message = event.log_level == "debug"
@@ -472,6 +486,18 @@ def stream_raw_events(self) -> Iterator[DbtCliEventMessage]:
                 if is_error_message:
                     self._error_messages.append(str(event))
 
+                # Attempt to parse the columns metadata from the event message.
+                # If it exists, then save it as metadata for the dbt node in the manifest.
+                if event.raw_event["info"]["name"] == "JinjaLogInfo":
+                    with contextlib.suppress(orjson.JSONDecodeError):
+                        columns = orjson.loads(event.raw_event["info"]["msg"])
+                        event_history_metadata_by_unique_id[cast(str, unique_id)] = {
+                            "columns": columns
+                        }
+
+                        # Don't show this message in stdout
+                        continue
+
                 # Only write debug logs to stdout if the user explicitly set
                 # the log level to debug.
                 if not is_debug_message or is_debug_user_log_level:

python_modules/libraries/dagster-dbt/dagster_dbt_tests/conftest.py

@@ -13,6 +13,7 @@
     test_dbt_alias_path,
     test_dbt_python_interleaving_path,
     test_meta_config_path,
+    test_metadata_path,
 )
 
 # ======= CONFIG ========
@@ -94,8 +95,10 @@ def dbt_build(dbt_executable, dbt_config_dir):
 
 
 def _create_dbt_manifest(project_dir: Path) -> Dict[str, Any]:
-    dbt = DbtCliResource(project_dir=os.fspath(project_dir))
-    dbt_invocation = dbt.cli(["--quiet", "compile"]).wait()
+    dbt = DbtCliResource(project_dir=os.fspath(project_dir), global_config_flags=["--quiet"])
+
+    dbt.cli(["deps"]).wait()
+    dbt_invocation = dbt.cli(["compile"]).wait()
 
     return dbt_invocation.get_artifact("manifest.json")
 
@@ -123,3 +126,8 @@ def test_dbt_python_interleaving_manifest_fixture() -> Dict[str, Any]:
 @pytest.fixture(name="test_meta_config_manifest", scope="session")
 def test_meta_config_manifest_fixture() -> Dict[str, Any]:
     return _create_dbt_manifest(test_meta_config_path)
+
+
+@pytest.fixture(name="test_metadata_manifest", scope="session")
+def test_metadata_manifest_fixture() -> Dict[str, Any]:
+    return _create_dbt_manifest(test_metadata_path)

python_modules/libraries/dagster-dbt/dagster_dbt_tests/core/test_resources_v2.py

@@ -487,8 +487,9 @@ def test_no_default_asset_events_emitted(data: dict) -> None:
                 "invocation_id": "1-2-3",
             },
             "data": data,
-        }
-    ).to_default_asset_events(manifest={})
+        },
+        metadata={},
+    ).to_default_asset_events(manifest={"nodes": {"a.b.c": {}}})
 
     assert list(asset_events) == []
 
@@ -531,7 +532,9 @@ def test_to_default_asset_output_events() -> None:
     }
 
     asset_events = list(
-        DbtCliEventMessage(raw_event=raw_event).to_default_asset_events(manifest=manifest)
+        DbtCliEventMessage(raw_event=raw_event, metadata={}).to_default_asset_events(
+            manifest=manifest
+        )
     )
 
     assert len(asset_events) == 1

python_modules/libraries/dagster-dbt/dagster_dbt_tests/dbt_packages/test_columns_metadata.py

@@ -0,0 +1,76 @@
+import os
+from typing import Any, Dict, cast
+
+from dagster import (
+    AssetExecutionContext,
+    Output,
+    TableColumn,
+    TableSchema,
+    materialize,
+)
+from dagster_dbt.asset_decorator import dbt_assets
+from dagster_dbt.core.resources_v2 import DbtCliResource
+
+from ..dbt_projects import test_meta_config_path, test_metadata_path
+
+
+def test_no_columns_metadata(test_meta_config_manifest: Dict[str, Any]) -> None:
+    @dbt_assets(manifest=test_meta_config_manifest)
+    def assert_no_columns_metadata(context: AssetExecutionContext, dbt: DbtCliResource):
+        events = list(dbt.cli(["build"], context=context).stream())
+        output_by_dbt_unique_id: Dict[str, Output] = {
+            cast(str, dagster_event.metadata["unique_id"].value): dagster_event
+            for dagster_event in events
+            if isinstance(dagster_event, Output)
+        }
+
+        for output in output_by_dbt_unique_id.values():
+            assert "columns" not in output.metadata
+
+        yield from events
+
+    result = materialize(
+        [assert_no_columns_metadata],
+        resources={"dbt": DbtCliResource(project_dir=os.fspath(test_meta_config_path))},
+    )
+
+    assert result.success
+
+
+def test_columns_metadata(test_metadata_manifest: Dict[str, Any]) -> None:
+    @dbt_assets(manifest=test_metadata_manifest)
+    def assert_columns_metadata(context: AssetExecutionContext, dbt: DbtCliResource):
+        events = list(dbt.cli(["build"], context=context).stream())
+        output_by_dbt_unique_id: Dict[str, Output] = {
+            cast(str, dagster_event.metadata["unique_id"].value): dagster_event
+            for dagster_event in events
+            if isinstance(dagster_event, Output)
+        }
+
+        for output in output_by_dbt_unique_id.values():
+            assert "columns" in output.metadata
+
+        customers_output = output_by_dbt_unique_id["model.test_dagster_metadata.customers"]
+        assert (
+            TableSchema(
+                columns=[
+                    TableColumn("customer_id", type="INTEGER"),
+                    TableColumn("first_name", type="character varying(256)"),
+                    TableColumn("last_name", type="character varying(256)"),
+                    TableColumn("first_order", type="DATE"),
+                    TableColumn("most_recent_order", type="DATE"),
+                    TableColumn("number_of_orders", type="BIGINT"),
+                    TableColumn("customer_lifetime_value", type="DOUBLE"),
+                ]
+            )
+            == customers_output.metadata["columns"].value
+        )
+
+        yield from events
+
+    result = materialize(
+        [assert_columns_metadata],
+        resources={"dbt": DbtCliResource(project_dir=os.fspath(test_metadata_path))},
+    )
+
+    assert result.success

python_modules/libraries/dagster-dbt/dagster_dbt_tests/dbt_projects/__init__.py

@@ -8,3 +8,4 @@
 test_dbt_python_interleaving_path = projects_path.joinpath("test_dagster_dbt_python_interleaving")
 test_exceptions_path = projects_path.joinpath("test_dagster_exceptions")
 test_meta_config_path = projects_path.joinpath("test_dagster_meta_config")
+test_metadata_path = projects_path.joinpath("test_dagster_metadata")

python_modules/libraries/dagster-dbt/dagster_dbt_tests/dbt_projects/test_dagster_metadata/.gitignore

@@ -9,3 +9,4 @@ venv/
 env/
 **/*.duckdb
 **/*.duckdb.wal
+package-lock.yml

python_modules/libraries/dagster-dbt/dagster_dbt_tests/dbt_projects/test_dagster_metadata/dbt_project.yml

@@ -20,7 +20,13 @@ clean-targets:
 require-dbt-version: [">=1.0.0", "<2.0.0"]
 
 models:
+  +post-hook:
+    - "{{ dagster.log_columns_in_relation() }}"
   test_dagster_metadata:
     materialized: table
     staging:
       materialized: view
+
+seeds:
+  +post-hook:
+    - "{{ dagster.log_columns_in_relation() }}"

python_modules/libraries/dagster-dbt/dagster_dbt_tests/dbt_projects/test_dagster_metadata/dependencies.yml

@@ -0,0 +1,2 @@
+packages:
+  - local: "../../../dbt_packages/dagster"