fix: Pgvector patch (feast-dev#4103)

Makefile

@@ -216,6 +216,25 @@ test-python-universal-postgres-online:
 				not test_snowflake" \
  			sdk/python/tests
 
+ test-python-universal-pgvector-online:
+	PYTHONPATH='.' \
+		FULL_REPO_CONFIGS_MODULE=sdk.python.feast.infra.online_stores.contrib.pgvector_repo_configuration \
+		PYTEST_PLUGINS=sdk.python.tests.integration.feature_repos.universal.online_store.postgres \
+		python -m pytest -n 8 --integration \
+ 			-k "not test_universal_cli and \
+ 				not test_go_feature_server and \
+ 				not test_feature_logging and \
+				not test_reorder_columns and \
+				not test_logged_features_validation and \
+				not test_lambda_materialization_consistency and \
+				not test_offline_write and \
+				not test_push_features_to_offline_store and \
+				not gcs_registry and \
+				not s3_registry and \
+ 				not test_universal_types and \
+				not test_snowflake" \
+ 			sdk/python/tests
+
  test-python-universal-mysql-online:
 	PYTHONPATH='.' \
 		FULL_REPO_CONFIGS_MODULE=sdk.python.feast.infra.online_stores.contrib.mysql_repo_configuration \

docs/reference/online-stores/postgres.md

@@ -30,6 +30,8 @@ online_store:
     sslkey_path: /path/to/client-key.pem
     sslcert_path: /path/to/client-cert.pem
     sslrootcert_path: /path/to/server-ca.pem
+    pgvector_enabled: false
+    vector_len: 512
 ```
 {% endcode %}
 
@@ -60,3 +62,29 @@ Below is a matrix indicating which functionality is supported by the Postgres on
 | collocated by entity key                                  | no       |
 
 To compare this set of functionality against other online stores, please see the full [functionality matrix](overview.md#functionality-matrix).
+
+## PGVector
+The Postgres online store supports the use of [PGVector](https://pgvector.dev/) for storing feature values.
+To enable PGVector, set `pgvector_enabled: true` in the online store configuration.
+The `vector_len` parameter can be used to specify the length of the vector. The default value is 512.
+
+Then you can use `retrieve_online_documents` to retrieve the top k closest vectors to a query vector.
+
+{% code title="python" %}
+```python
+from feast import FeatureStore
+from feast.infra.online_stores.postgres import retrieve_online_documents
+
+feature_store = FeatureStore(repo_path=".")
+
+query_vector = [0.1, 0.2, 0.3, 0.4, 0.5]
+top_k = 5
+
+feature_values = retrieve_online_documents(
+    feature_store=feature_store,
+    feature_view_name="document_fv:embedding_float",
+    query_vector=query_vector,
+    top_k=top_k,
+)
+```
+{% endcode %}

sdk/python/feast/infra/key_encoding_utils.py

@@ -74,8 +74,13 @@ def serialize_entity_key(
     return b"".join(output)
 
 
-def get_val_str(val):
-    accept_value_types = ["float_list_val", "double_list_val", "int_list_val"]
+def get_list_val_str(val):
+    accept_value_types = [
+        "float_list_val",
+        "double_list_val",
+        "int32_list_val",
+        "int64_list_val",
+    ]
     for accept_type in accept_value_types:
         if val.HasField(accept_type):
             return str(getattr(val, accept_type).val)

sdk/python/feast/infra/online_stores/contrib/pgvector_repo_configuration.py

@@ -0,0 +1,12 @@
+from tests.integration.feature_repos.integration_test_repo_config import (
+    IntegrationTestRepoConfig,
+)
+from tests.integration.feature_repos.universal.online_store.postgres import (
+    PGVectorOnlineStoreCreator,
+)
+
+FULL_REPO_CONFIGS = [
+    IntegrationTestRepoConfig(
+        online_store="pgvector", online_store_creator=PGVectorOnlineStoreCreator
+    ),
+]

sdk/python/feast/infra/online_stores/contrib/postgres.py

@@ -2,7 +2,7 @@
 import logging
 from collections import defaultdict
 from datetime import datetime
-from typing import Any, Callable, Dict, List, Literal, Optional, Sequence, Tuple, Union
+from typing import Any, Callable, Dict, List, Literal, Optional, Sequence, Tuple
 
 import psycopg2
 import pytz
@@ -12,7 +12,7 @@
 
 from feast import Entity
 from feast.feature_view import FeatureView
-from feast.infra.key_encoding_utils import get_val_str, serialize_entity_key
+from feast.infra.key_encoding_utils import get_list_val_str, serialize_entity_key
 from feast.infra.online_stores.online_store import OnlineStore
 from feast.infra.utils.postgres.connection_utils import _get_conn, _get_connection_pool
 from feast.infra.utils.postgres.postgres_config import ConnectionType, PostgreSQLConfig
@@ -74,19 +74,18 @@ def online_write_batch(
                     created_ts = _to_naive_utc(created_ts)
 
                 for feature_name, val in values.items():
-                    val_str: Union[str, bytes]
+                    vector_val = None
                     if (
-                        "pgvector_enabled" in config.online_config
-                        and config.online_config["pgvector_enabled"]
+                        "pgvector_enabled" in config.online_store
+                        and config.online_store.pgvector_enabled
                     ):
-                        val_str = get_val_str(val)
-                    else:
-                        val_str = val.SerializeToString()
+                        vector_val = get_list_val_str(val)
                     insert_values.append(
                         (
                             entity_key_bin,
                             feature_name,
-                            val_str,
+                            val.SerializeToString(),
+                            vector_val,
                             timestamp,
                             created_ts,
                         )
@@ -100,11 +99,12 @@ def online_write_batch(
                     sql.SQL(
                         """
                         INSERT INTO {}
-                        (entity_key, feature_name, value, event_ts, created_ts)
+                        (entity_key, feature_name, value, vector_value, event_ts, created_ts)
                         VALUES %s
                         ON CONFLICT (entity_key, feature_name) DO
                         UPDATE SET
                             value = EXCLUDED.value,
+                            vector_value = EXCLUDED.vector_value,
                             event_ts = EXCLUDED.event_ts,
                             created_ts = EXCLUDED.created_ts;
                         """,
@@ -226,20 +226,23 @@ def update(
 
             for table in tables_to_keep:
                 table_name = _table_id(project, table)
-                value_type = "BYTEA"
                 if (
-                    "pgvector_enabled" in config.online_config
-                    and config.online_config["pgvector_enabled"]
+                    "pgvector_enabled" in config.online_store
+                    and config.online_store.pgvector_enabled
                 ):
-                    value_type = f'vector({config.online_config["vector_len"]})'
+                    vector_value_type = f"vector({config.online_store.vector_len})"
+                else:
+                    # keep the vector_value_type as BYTEA if pgvector is not enabled, to maintain compatibility
+                    vector_value_type = "BYTEA"
                 cur.execute(
                     sql.SQL(
                         """
                         CREATE TABLE IF NOT EXISTS {}
                         (
                             entity_key BYTEA,
                             feature_name TEXT,
-                            value {},
+                            value BYTEA,
+                            vector_value {} NULL,
                             event_ts TIMESTAMPTZ,
                             created_ts TIMESTAMPTZ,
                             PRIMARY KEY(entity_key, feature_name)
@@ -248,7 +251,7 @@ def update(
                         """
                     ).format(
                         sql.Identifier(table_name),
-                        sql.SQL(value_type),
+                        sql.SQL(vector_value_type),
                         sql.Identifier(f"{table_name}_ek"),
                         sql.Identifier(table_name),
                     )
@@ -294,6 +297,14 @@ def retrieve_online_documents(
         """
         project = config.project
 
+        if (
+            "pgvector_enabled" not in config.online_store
+            or not config.online_store.pgvector_enabled
+        ):
+            raise ValueError(
+                "pgvector is not enabled in the online store configuration"
+            )
+
         # Convert the embedding to a string to be used in postgres vector search
         query_embedding_str = f"[{','.join(str(el) for el in embedding)}]"
 
@@ -311,8 +322,8 @@ def retrieve_online_documents(
                     SELECT
                         entity_key,
                         feature_name,
-                        value,
-                        value <-> %s as distance,
+                        vector_value,
+                        vector_value <-> %s as distance,
                         event_ts FROM {table_name}
                     WHERE feature_name = {feature_name}
                     ORDER BY distance
@@ -327,13 +338,13 @@ def retrieve_online_documents(
             )
             rows = cur.fetchall()
 
-            for entity_key, feature_name, value, distance, event_ts in rows:
+            for entity_key, feature_name, vector_value, distance, event_ts in rows:
                 # TODO Deserialize entity_key to return the entity in response
                 # entity_key_proto = EntityKeyProto()
                 # entity_key_proto_bin = bytes(entity_key)
 
                 # TODO Convert to List[float] for value type proto
-                feature_value_proto = ValueProto(string_val=value)
+                feature_value_proto = ValueProto(string_val=vector_value)
 
                 distance_value_proto = ValueProto(float_val=distance)
                 result.append((event_ts, feature_value_proto, distance_value_proto))

sdk/python/feast/infra/online_stores/contrib/postgres_repo_configuration.py

@@ -2,17 +2,11 @@
     IntegrationTestRepoConfig,
 )
 from tests.integration.feature_repos.universal.online_store.postgres import (
-    PGVectorOnlineStoreCreator,
     PostgresOnlineStoreCreator,
 )
 
 FULL_REPO_CONFIGS = [
     IntegrationTestRepoConfig(
         online_store="postgres", online_store_creator=PostgresOnlineStoreCreator
     ),
-    IntegrationTestRepoConfig(
-        online_store="pgvector", online_store_creator=PGVectorOnlineStoreCreator
-    ),
 ]
-
-AVAILABLE_ONLINE_STORES = {"pgvector": PGVectorOnlineStoreCreator}

sdk/python/tests/integration/feature_repos/universal/online_store/init.sql

@@ -0,0 +1 @@
+CREATE EXTENSION IF NOT EXISTS vector;

sdk/python/tests/integration/feature_repos/universal/online_store/postgres.py

@@ -1,3 +1,4 @@
+import os
 from typing import Dict
 
 from testcontainers.core.container import DockerContainer
@@ -37,12 +38,17 @@ def teardown(self):
 class PGVectorOnlineStoreCreator(OnlineStoreCreator):
     def __init__(self, project_name: str, **kwargs):
         super().__init__(project_name)
+        script_directory = os.path.dirname(os.path.abspath(__file__))
         self.container = (
             DockerContainer("pgvector/pgvector:pg16")
             .with_env("POSTGRES_USER", "root")
             .with_env("POSTGRES_PASSWORD", "test")
             .with_env("POSTGRES_DB", "test")
             .with_exposed_ports(5432)
+            .with_volume_mapping(
+                os.path.join(script_directory, "init.sql"),
+                "/docker-entrypoint-initdb.d/init.sql",
+            )
         )
 
     def create_online_store(self) -> Dict[str, str]:
@@ -51,8 +57,10 @@ def create_online_store(self) -> Dict[str, str]:
         wait_for_logs(
             container=self.container, predicate=log_string_to_wait_for, timeout=10
         )
-        command = "psql -h localhost -p 5432 -U root -d test -c 'CREATE EXTENSION IF NOT EXISTS vector;'"
-        self.container.exec(command)
+        init_log_string_to_wait_for = "PostgreSQL init process complete"
+        wait_for_logs(
+            container=self.container, predicate=init_log_string_to_wait_for, timeout=10
+        )
         return {
             "host": "localhost",
             "type": "postgres",