feat: Added delete_table to redis online store (#3857)

* feat: Added delete_table to redis online store

Signed-off-by: Jiwon Park <phil.park@sktelecom.com>

* fix: Fix hdel params to *args

Signed-off-by: Jiwon Park <phil.park@sktelecom.com>

---------

Signed-off-by: Jiwon Park <phil.park@sktelecom.com>

sdk/python/feast/infra/online_stores/redis.py

@@ -106,6 +106,39 @@ def delete_entity_values(self, config: RepoConfig, join_keys: List[str]):
 
         logger.debug(f"Deleted {deleted_count} rows for entity {', '.join(join_keys)}")
 
+    def delete_table(self, config: RepoConfig, table: FeatureView):
+        """
+        Delete all rows in Redis for a specific feature view
+
+        Args:
+            config: Feast config
+            table: Feature view to delete
+        """
+        client = self._get_client(config.online_store)
+        deleted_count = 0
+        prefix = _redis_key_prefix(table.join_keys)
+
+        redis_hash_keys = [_mmh3(f"{table.name}:{f.name}") for f in table.features]
+        redis_hash_keys.append(bytes(f"_ts:{table.name}", "utf8"))
+
+        with client.pipeline(transaction=False) as pipe:
+            for _k in client.scan_iter(
+                b"".join([prefix, b"*", config.project.encode("utf8")])
+            ):
+                _tables = {
+                    _hk[4:] for _hk in client.hgetall(_k) if _hk.startswith(b"_ts:")
+                }
+                if bytes(table.name, "utf8") not in _tables:
+                    continue
+                if len(_tables) == 1:
+                    pipe.delete(_k)
+                else:
+                    pipe.hdel(_k, *redis_hash_keys)
+                deleted_count += 1
+            pipe.execute()
+
+        logger.debug(f"Deleted {deleted_count} rows for feature view {table.name}")
+
     @log_exceptions_and_usage(online_store="redis")
     def update(
         self,
@@ -117,16 +150,19 @@ def update(
         partial: bool,
     ):
         """
-        Look for join_keys (list of entities) that are not in use anymore
-        (usually this happens when the last feature view that was using specific compound key is deleted)
-        and remove all features attached to this "join_keys".
+        Delete data from feature views that are no longer in use.
+
+        Args:
+            config: Feast config
+            tables_to_delete: Feature views to delete
+            tables_to_keep: Feature views to keep
+            entities_to_delete: Entities to delete
+            entities_to_keep: Entities to keep
+            partial: Whether to do a partial update
         """
-        join_keys_to_keep = set(tuple(table.join_keys) for table in tables_to_keep)
 
-        join_keys_to_delete = set(tuple(table.join_keys) for table in tables_to_delete)
-
-        for join_keys in join_keys_to_delete - join_keys_to_keep:
-            self.delete_entity_values(config, list(join_keys))
+        for table in tables_to_delete:
+            self.delete_table(config, table)
 
     def teardown(
         self,