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Column level lineage example on source assets #90

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Column level lineage example on source assets #90

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41 changes: 40 additions & 1 deletion hooli_data_eng/assets/amp_test/amp_test.py
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Original file line number Diff line number Diff line change
@@ -1,4 +1,10 @@
from dagster import AutoMaterializePolicy, AssetExecutionContext, DataVersion, asset, observable_source_asset
from dagster import (
AutoMaterializePolicy, AssetExecutionContext, DataVersion, asset, observable_source_asset, SourceAsset,
MaterializeResult,
TableColumnDep,
AssetKey,
TableColumnLineage,
)
from dagster._utils import file_relative_path
import os
import pandas as pd
Expand All @@ -18,6 +24,39 @@ def source_file():
return DataVersion(str(os.path.getmtime(USERS_CSV_PATH)) )


# Define the source asset
my_source_asset = SourceAsset(key="my_source_asset")

# Define the dependent asset
@asset(
deps=["my_source_asset"],
)
def dependent_asset() -> MaterializeResult:
return MaterializeResult(
metadata={
"dagster/column_lineage": TableColumnLineage(
deps_by_column={
"new_column_foo": [
TableColumnDep(
asset_key=AssetKey("my_source_asset"),
column_name="column_bar",
),
TableColumnDep(
asset_key=AssetKey("my_source_asset"),
column_name="column_baz",
),
],
"new_column_qux": [
TableColumnDep(
asset_key=AssetKey("my_source_asset"),
column_name="column_quuz",
),
],
}
)
}
)

@asset(
deps=["observable_source_asset_key"],
auto_materialize_policy=AutoMaterializePolicy.eager(),
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