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feat: Add DynamoDB in-place list update support for array-based features #5916

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Merged

franciscojavierarceo merged 4 commits into feast-dev:master from anshishrivastava:feat/dynamodb-list-updates

Feb 4, 2026

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feat: Add DynamoDB in-place list update support for array-based features #5916

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aca9589

feat: add DynamoDB in-place list update support for array-based features

anshishr Jan 29, 2026

9dd1ab9

refactor: remove sync update_online_store, keep only async version

anshishr Jan 30, 2026

5220c2e

Merge branch 'master' into feat/dynamodb-list-updates

anshishrivastava Feb 2, 2026

118cab2

Merge branch 'master' into feat/dynamodb-list-updates

anshishrivastava Feb 3, 2026

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85 changes: 85 additions & 0 deletions 85 sdk/python/feast/feature_store.py

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Original file line number	Diff line number	Diff line change
Expand Up		@@ -2253,6 +2253,91 @@ async def write_to_online_store_async(
		provider = self._get_provider()
		await provider.ingest_df_async(feature_view, df)

		async def update_online_store(
		self,
		feature_view_name: str,
		df: pd.DataFrame,
		update_expressions: Dict[str, str],
		allow_registry_cache: bool = True,
		) -> None:
		"""
		Update features using DynamoDB-specific list operations.

		This method provides efficient in-place list updates using DynamoDB's native
		UpdateItem operations with list_append and other expressions. This is more
		efficient than the read-modify-write pattern for array-based features.

		Args:
		feature_view_name: The feature view to update.
		df: DataFrame with new values to append/prepend to existing lists.
		update_expressions: Dict mapping feature names to DynamoDB update expressions.
		Examples:
		- {"transactions": "list_append(transactions, :new_val)"} # append
		- {"recent_items": "list_append(:new_val, recent_items)"} # prepend
		allow_registry_cache: Whether to allow cached registry.

		Raises:
		NotImplementedError: If online store doesn't support update expressions.
		ValueError: If the feature view or update expressions are invalid.

		Example:
		# Append new transactions to existing transaction history
		await store.update_online_store(
		feature_view_name="user_transactions",
		df=new_transactions_df,
		update_expressions={
		"transaction_history": "list_append(transaction_history, :new_val)",
		"recent_amounts": "list_append(:new_val, recent_amounts)" # prepend
		}
		)
		"""
		# Check if online store supports update expressions
		provider = self._get_provider()
		if not hasattr(provider.online_store, "update_online_store_async"):
		raise NotImplementedError(
		f"Online store {type(provider.online_store).__name__} "
		"does not support async update expressions. This feature is only available "
		"with DynamoDB online store."
		)

		feature_view, df = self._get_feature_view_and_df_for_online_write(
		feature_view_name=feature_view_name,
		df=df,
		allow_registry_cache=allow_registry_cache,
		transform_on_write=False, # Don't transform for updates
		)

		# Validate that the dataframe has meaningful feature data
		if df is not None:
		if df.empty:
		warnings.warn("Cannot update with empty dataframe")
		return

		# Check if feature columns are empty
		feature_column_names = [f.name for f in feature_view.features]
		if feature_column_names:
		feature_df = df[feature_column_names]
		if feature_df.empty or feature_df.isnull().all().all():
		warnings.warn("Cannot update with empty feature columns")
		return

		# Prepare data for online store
		from feast.infra.passthrough_provider import PassthroughProvider

		rows_to_write = PassthroughProvider._prep_rows_to_write_for_ingestion(
		feature_view=feature_view,
		df=df,
		)

		# Call DynamoDB-specific async method
		await provider.online_store.update_online_store_async(
		config=self.config,
		table=feature_view,
		data=rows_to_write,
		update_expressions=update_expressions,
		progress=None,
		)

		def write_to_offline_store(
		self,
		feature_view_name: str,
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