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398 | class DuckDBVectorStore(BasePydanticVectorStore):
"""DuckDB向量存储。
在这个向量存储中，嵌入是存储在DuckDB数据库中的。
在查询时，索引使用DuckDB查询前k个最相似的节点。
示例：
`pip install llama-index-vector-stores-duckdb`
```python
from llama_index.vector_stores.duckdb import DuckDBVectorStore
# in-memory
vector_store = DuckDBVectorStore()
# persist to disk
vector_store = DuckDBVectorStore("pg.duckdb", persist_dir="./persist/")
```"""
stores_text: bool = True
flat_metadata: bool = True
database_name: Optional[str]
table_name: Optional[str]
# schema_name: Optional[str] # TODO: support schema name
embed_dim: Optional[int]
# hybrid_search: Optional[bool] # TODO: support hybrid search
text_search_config: Optional[dict]
persist_dir: Optional[str]
_conn: Any = PrivateAttr()
_is_initialized: bool = PrivateAttr(default=False)
_database_path: Optional[str] = PrivateAttr()
def __init__(
self,
database_name: Optional[str] = ":memory:",
table_name: Optional[str] = "documents",
# schema_name: Optional[str] = "main",
embed_dim: Optional[int] = None,
# hybrid_search: Optional[bool] = False,
# https://duckdb.org/docs/extensions/full_text_search
text_search_config: Optional[dict] = {
"stemmer": "english",
"stopwords": "english",
"ignore": "(\\.|[^a-z])+",
"strip_accents": True,
"lower": True,
"overwrite": False,
},
persist_dir: Optional[str] = "./storage",
**kwargs: Any,
) -> None:
"""初始化参数。"""
try:
import duckdb
except ImportError:
raise ImportError(import_err_msg)
self._is_initialized = False
if database_name == ":memory:":
_home_dir = os.path.expanduser("~")
self._conn = duckdb.connect(database_name)
self._conn.execute(f"SET home_directory='{_home_dir}';")
self._conn.install_extension("json")
self._conn.load_extension("json")
self._conn.install_extension("fts")
self._conn.load_extension("fts")
else:
# check if persist dir exists
if not os.path.exists(persist_dir):
os.makedirs(persist_dir)
self._database_path = os.path.join(persist_dir, database_name)
with DuckDBLocalContext(self._database_path) as _conn:
pass
self._conn = None
super().__init__(
database_name=database_name,
table_name=table_name,
# schema_name=schema_name,
embed_dim=embed_dim,
# hybrid_search=hybrid_search,
text_search_config=text_search_config,
persist_dir=persist_dir,
)
@classmethod
def from_local(
cls, database_path: str, table_name: str = "documents"
) -> "DuckDBVectorStore":
"""从本地文件加载DuckDB向量存储。"""
with DuckDBLocalContext(database_path) as _conn:
try:
_table_info = _conn.execute(f"SHOW {table_name};").fetchall()
except Exception as e:
raise ValueError(f"Index table {table_name} not found in the database.")
# Not testing for the column type similarity only testing for the column names.
_std = {"text", "node_id", "embedding", "metadata_"}
_ti = {_i[0] for _i in _table_info}
if _std != _ti:
raise ValueError(
f"Index table {table_name} does not have the correct schema."
)
_cls = cls(
database_name=os.path.basename(database_path),
table_name=table_name,
persist_dir=os.path.dirname(database_path),
)
_cls._is_initialized = True
return _cls
@classmethod
def from_params(
cls,
database_name: Optional[str] = ":memory:",
table_name: Optional[str] = "documents",
# schema_name: Optional[str] = "main",
embed_dim: Optional[int] = None,
# hybrid_search: Optional[bool] = False,
text_search_config: Optional[dict] = {
"stemmer": "english",
"stopwords": "english",
"ignore": "(\\.|[^a-z])+",
"strip_accents": True,
"lower": True,
"overwrite": False,
},
persist_dir: Optional[str] = "./storage",
**kwargs: Any,
) -> "DuckDBVectorStore":
return cls(
database_name=database_name,
table_name=table_name,
# schema_name=schema_name,
embed_dim=embed_dim,
# hybrid_search=hybrid_search,
text_search_config=text_search_config,
persist_dir=persist_dir,
**kwargs,
)
@classmethod
def class_name(cls) -> str:
return "DuckDBVectorStore"
@property
def client(self) -> Any:
"""返回客户端。"""
return self._conn
def _initialize(self) -> None:
if not self._is_initialized:
# TODO: schema.table also.
# Check if table and type is present
# if not, create table
if self.embed_dim is None:
_query = f"""
CREATE TABLE {self.table_name} (
node_id VARCHAR,
text TEXT,
embedding FLOAT[],
metadata_ JSON
);
"""
else:
_query = f"""
CREATE TABLE {self.table_name} (
node_id VARCHAR,
text TEXT,
embedding FLOAT[{self.embed_dim}],
metadata_ JSON
);
"""
if self.database_name == ":memory:":
self._conn.execute(_query)
else:
with DuckDBLocalContext(self._database_path) as _conn:
_conn.execute(_query)
self._is_initialized = True
def _node_to_table_row(self, node: BaseNode) -> Any:
return (
node.node_id,
node.get_content(metadata_mode=MetadataMode.NONE),
node.get_embedding(),
node_to_metadata_dict(
node,
remove_text=True,
flat_metadata=self.flat_metadata,
),
)
def add(self, nodes: List[BaseNode], **add_kwargs: Any) -> List[str]:
"""将节点添加到索引中。
Args:
节点: List[BaseNode]: 带有嵌入的节点列表
"""
self._initialize()
ids = []
if self.database_name == ":memory:":
_table = self._conn.table(self.table_name)
for node in nodes:
ids.append(node.node_id)
_row = self._node_to_table_row(node)
_table.insert(_row)
else:
with DuckDBLocalContext(self._database_path) as _conn:
_table = _conn.table(self.table_name)
for node in nodes:
ids.append(node.node_id)
_row = self._node_to_table_row(node)
_table.insert(_row)
return ids
def delete(self, ref_doc_id: str, **delete_kwargs: Any) -> None:
"""使用ref_doc_id删除节点。
Args:
ref_doc_id（str）：要删除的文档的doc_id。
"""
_ddb_query = f"""
DELETE FROM {self.table_name}
WHERE json_extract_string(metadata_, '$.ref_doc_id') = '{ref_doc_id}';
"""
if self.database_name == ":memory:":
self._conn.execute(_ddb_query)
else:
with DuckDBLocalContext(self._database_path) as _conn:
_conn.execute(_ddb_query)
@staticmethod
def _build_metadata_filter_condition(
standard_filters: MetadataFilters,
) -> dict:
"""将标准元数据过滤器翻译为DuckDB SQL规范。"""
filters_list = []
# condition = standard_filters.condition or "and" ## and/or as strings.
condition = "AND"
_filters_condition_list = []
for filter in standard_filters.filters:
if filter.operator:
if filter.operator in [
"<",
">",
"<=",
">=",
"<>",
"!=",
]:
filters_list.append((filter.key, filter.operator, filter.value))
elif filter.operator in ["=="]:
filters_list.append((filter.key, "=", filter.value))
else:
raise ValueError(
f"Filter operator {filter.operator} not supported."
)
else:
filters_list.append((filter.key, "=", filter.value))
for _fc in filters_list:
if isinstance(_fc[2], str):
_filters_condition_list.append(
f"json_extract_string(metadata_, '$.{_fc[0]}') {_fc[1]} '{_fc[2]}'"
)
else:
_filters_condition_list.append(
f"json_extract(metadata_, '$.{_fc[0]}') {_fc[1]} {_fc[2]}"
)
return f" {condition} ".join(_filters_condition_list)
def query(self, query: VectorStoreQuery, **kwargs: Any) -> VectorStoreQueryResult:
"""查询索引以获取前k个最相似的节点。
Args:
query.query_embedding（List[float]）：查询嵌入
query.similarity_top_k（int）：前k个最相似的节点
"""
nodes = []
similarities = []
ids = []
if query.filters is not None:
# TODO: results from the metadata filter query
_filter_string = self._build_metadata_filter_condition(query.filters)
_ddb_query = f"""
SELECT node_id, text, embedding, metadata_, score
FROM (
SELECT *, list_cosine_similarity(embedding, {query.query_embedding}) AS score
FROM {self.table_name}
WHERE {_filter_string}
) sq
WHERE score IS NOT NULL
ORDER BY score DESC LIMIT {query.similarity_top_k};
"""
else:
_ddb_query = f"""
SELECT node_id, text, embedding, metadata_, score
FROM (
SELECT *, list_cosine_similarity(embedding, {query.query_embedding}) AS score
FROM {self.table_name}
) sq
WHERE score IS NOT NULL
ORDER BY score DESC LIMIT {query.similarity_top_k};
"""
if self.database_name == ":memory:":
_final_results = self._conn.execute(_ddb_query).fetchall()
else:
with DuckDBLocalContext(self._database_path) as _conn:
_final_results = _conn.execute(_ddb_query).fetchall()
for _row in _final_results:
node = TextNode(
id_=_row[0],
text=_row[1],
embedding=_row[2],
metadata=json.loads(_row[3]),
)
nodes.append(node)
similarities.append(_row[4])
ids.append(_row[0])
return VectorStoreQueryResult(nodes=nodes, similarities=similarities, ids=ids)
|