Byted Bytehouse Hybrid Search

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# Copyright (c) 2025 Beijing Volcano Engine Technology Co., Ltd. and/or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from .embedding import TextEmbedding
from .hybrid_search_client import ByteHouseHybridSearch

__all__ = ["TextEmbedding", "ByteHouseHybridSearch"]

# Copyright (c) 2025 Beijing Volcano Engine Technology Co., Ltd. and/or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
文本向量化模块，基于火山引擎方舟API
"""
import os
import openai
from typing import List, Optional

class TextEmbedding:
    def __init__(self, 
                 api_key: Optional[str] = None,
                 base_url: Optional[str] = None,
                 model: Optional[str] = None,
                 dimensions: Optional[int] = None):
        """
        初始化文本向量化客户端
        :param api_key: 方舟API密钥，默认从环境变量ARK_API_KEY读取
        :param base_url: 方舟API地址，默认从环境变量ARK_BASE_URL读取
        :param model: 向量化模型，默认从环境变量EMBEDDING_MODEL读取
        :param dimensions: 向量维度，默认从环境变量EMBEDDING_DIMENSIONS读取，默认1536
        """
        self.api_key = api_key or os.getenv("ARK_API_KEY")
        self.base_url = base_url or os.getenv("ARK_BASE_URL", "https://ark.cn-beijing.volces.com/api/v3")
        self.model = model or os.getenv("EMBEDDING_MODEL", "doubao-embedding-text-240715")
        self.dimensions = dimensions or int(os.getenv("EMBEDDING_DIMENSIONS", "2560"))
        
        if not self.api_key:
            raise ValueError("请配置ARK_API_KEY环境变量或传入api_key参数")
        
        self.client = openai.OpenAI(
            api_key=self.api_key,
            base_url=self.base_url
        )
    
    def embed_text(self, text: str) -> List[float]:
        """
        生成单个文本的向量
        :param text: 输入文本
        :return: 向量列表
        """
        params = {
            "input": text,
            "model": self.model
        }
        # 仅当dimensions存在时传递参数，部分模型不支持自定义维度
        if self.dimensions:
            params["dimensions"] = self.dimensions
        
        response = self.client.embeddings.create(**params)
        return response.data[0].embedding
    
    def batch_embed_texts(self, texts: List[str]) -> List[List[float]]:
        """
        批量生成文本向量
        :param texts: 输入文本列表
        :return: 向量列表
        """
        params = {
            "input": texts,
            "model": self.model
        }
        # 仅当dimensions存在时传递参数，部分模型不支持自定义维度
        if self.dimensions:
            params["dimensions"] = self.dimensions
        
        response = self.client.embeddings.create(**params)
        return [item.embedding for item in response.data]

# Copyright (c) 2025 Beijing Volcano Engine Technology Co., Ltd. and/or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.


"""
ByteHouse 混合检索使用示例
"""
from hybrid_search_client import ByteHouseHybridSearch

def main():
    # 初始化客户端
    search = ByteHouseHybridSearch(connection_type="http")
    
    table_name = "demo_hybrid_index"
    
    # 1. 创建混合检索表
    print("=== 创建混合检索表 ===")
    search.create_hybrid_table(table_name, if_not_exists=True)
    
    # 2. 插入测试数据
    print("\n=== 插入测试数据 ===")
    documents = [
        {
            "doc_id": 1,
            "title": "ByteHouse 全文检索",
            "content": "ByteHouse 企业版支持全文检索能力，基于倒排索引实现，支持BM25相似度计算，可快速检索文本内容。"
        },
        {
            "doc_id": 2,
            "title": "ByteHouse 向量检索",
            "content": "ByteHouse 支持向量检索功能，基于HNSW索引实现，支持余弦相似度、L2距离等多种相似度计算方式。"
        },
        {
            "doc_id": 3,
            "title": "混合检索最佳实践",
            "content": "结合全文检索和向量检索的优势，使用RRF重排算法可以实现更精准的检索效果，兼顾关键词匹配和语义匹配。"
        },
        {
            "doc_id": 4,
            "title": "RRF重排算法",
            "content": "RRF（Reciprocal Rank Fusion）是一种常用的多路召回融合算法，通过对不同召回源的排名进行加权融合，得到最终的排序结果。"
        },
        {
            "doc_id": 5,
            "title": "ClickHouse 二级索引",
            "content": "ClickHouse 支持二级索引功能，包括跳数索引、全文倒排索引、向量索引等，可大幅提升查询性能。"
        }
    ]
    search.batch_insert_documents(table_name, documents)
    print("测试数据插入完成")
    
    # 3. 全文检索示例
    print("\n=== 全文检索示例，查询：'ByteHouse 检索' ===")
    fulltext_results = search.fulltext_search(table_name, query="ByteHouse 检索", top_k=3)
    for i, res in enumerate(fulltext_results):
        print(f"排名 {i+1}: [doc_id={res['doc_id']}] {res['title']}，BM25分数：{res['bm25_score']:.4f}")
        print(f"内容摘要：{res['content'][:50]}...\n")
    
    # 4. 向量检索示例
    print("\n=== 向量检索示例，查询：'怎么实现更好的检索效果' ===")
    vector_results = search.vector_search(table_name, query="怎么实现更好的检索效果", top_k=3)
    for i, res in enumerate(vector_results):
        print(f"排名 {i+1}: [doc_id={res['doc_id']}] {res['title']}，向量相似度：{res['vector_score']:.4f}")
        print(f"内容摘要：{res['content'][:50]}...\n")
    
    # 5. 混合检索+RRF重排示例
    print("\n=== 混合检索+RRF重排示例，查询：'ByteHouse 检索效果优化' ===")
    hybrid_results = search.hybrid_search(table_name, query="ByteHouse 检索效果优化", top_k=3)
    for i, res in enumerate(hybrid_results):
        print(f"排名 {i+1}: [doc_id={res['doc_id']}] {res['title']}，RRF分数：{res['rrf_score']:.4f}")
        if 'bm25_score' in res:
            print(f"BM25分数：{res['bm25_score']:.4f}")
        if 'vector_score' in res:
            print(f"向量相似度：{res['vector_score']:.4f}")
        print(f"内容摘要：{res['content'][:80]}...\n")
    
    # 关闭连接
    search.close()

if __name__ == "__main__":
    main()

# Copyright (c) 2025 Beijing Volcano Engine Technology Co., Ltd. and/or its affiliates.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
ByteHouse 混合检索客户端
支持全文检索、向量检索、RRF重排
"""
import os
import clickhouse_connect
from typing import List, Dict, Optional, Any
from .embedding import TextEmbedding

class ByteHouseHybridSearch:
    def __init__(self,
                 host: Optional[str] = None,
                 port: Optional[int] = None,
                 user: Optional[str] = None,
                 password: Optional[str] = None,
                 database: Optional[str] = None,
                 secure: Optional[bool] = None,
                 connection_type: str = "http"):
        """
        初始化ByteHouse客户端
        :param host: ByteHouse地址，默认从环境变量BYTEHOUSE_HOST读取
        :param port: ByteHouse端口，默认从环境变量BYTEHOUSE_PORT读取
        :param user: 用户名，默认从环境变量BYTEHOUSE_USER读取
        :param password: 密码，默认从环境变量BYTEHOUSE_PASSWORD读取
        :param database: 默认数据库，默认从环境变量BYTEHOUSE_DATABASE读取，默认default
        :param secure: 是否启用加密，默认从环境变量BYTEHOUSE_SECURE读取，默认True
        :param connection_type: 连接类型，http或native，默认http
        """
        self.host = host or os.getenv("BYTEHOUSE_HOST")
        self.port = port or int(os.getenv("BYTEHOUSE_PORT", "8123"))
        self.user = user or os.getenv("BYTEHOUSE_USER", "default")
        self.password = password or os.getenv("BYTEHOUSE_PASSWORD")
        self.database = database or os.getenv("BYTEHOUSE_DATABASE", "default")
        self.secure = secure if secure is not None else (os.getenv("BYTEHOUSE_SECURE", "true").lower() == "true")
        
        if not self.host or not self.password:
            raise ValueError("请配置BYTEHOUSE_HOST和BYTEHOUSE_PASSWORD环境变量")
        
        # 初始化ByteHouse连接
        self.client = clickhouse_connect.get_client(
            host=self.host,
            port=self.port,
            username=self.user,
            password=self.password,
            database=self.database,
            secure=self.secure,
            connect_timeout=30,
            send_receive_timeout=60
        )
        
        # 初始化向量化客户端
        self.embedding_client = TextEmbedding()
    
    def create_hybrid_table(self, table_name: str, if_not_exists: bool = True) -> None:
        """
        创建混合检索表，自动构建全文倒排索引和向量索引
        :param table_name: 表名
        :param if_not_exists: 是否存在就跳过，默认True
        """
        exists_clause = "IF NOT EXISTS" if if_not_exists else ""
        vec_dimensions = self.embedding_client.dimensions
        # 兼容旧版本ByteHouse，先创建基础表，索引可后续手动添加
        create_sql = f"""
        CREATE TABLE {exists_clause} {table_name} (
            `doc_id` UInt64,
            `title` String,
            `content` String,
            `embedding` Array(Float32),
            `create_time` DateTime DEFAULT now(),
            INDEX content_idx content TYPE inverted('standard', '{{\"version\":\"v2\"}}') GRANULARITY 1,
            INDEX embedding_idx embedding TYPE HNSW_SQ('DIM={vec_dimensions}', 'metric=COSINE', 'M=32', 'EF_CONSTRUCTION=256') GRANULARITY 1
        )
        ENGINE = MergeTree()
        ORDER BY doc_id
        SETTINGS
            index_granularity = 1024
        """
        self.client.command(create_sql)
        print(f"混合检索表 {table_name} 创建成功，向量维度：{vec_dimensions}")
    
    def insert_document(self, table_name: str, doc_id: int, title: str, content: str) -> None:
        """
        插入单个文档
        :param table_name: 表名
        :param doc_id: 文档ID
        :param title: 文档标题
        :param content: 文档内容
        """
        # 拼接标题和内容生成向量
        full_text = f"标题：{title} 内容：{content}"
        embedding = self.embedding_client.embed_text(full_text)
        
        insert_sql = f"""
        INSERT INTO {table_name} (doc_id, title, content, embedding)
        VALUES (%s, %s, %s, %s)
        """
        self.client.command(insert_sql, parameters=[doc_id, title, content, embedding])
    
    def batch_insert_documents(self, table_name: str, documents: List[Dict[str, Any]]) -> None:
        """
        批量插入文档
        :param table_name: 表名
        :param documents: 文档列表，每个元素包含doc_id, title, content字段
        """
        # 批量生成向量
        full_texts = [f"标题：{doc['title']} 内容：{doc['content']}" for doc in documents]
        embeddings = self.embedding_client.batch_embed_texts(full_texts)
        # 验证向量维度正确性
        for emb in embeddings:
            if len(emb) != self.embedding_client.dimensions:
                raise ValueError(f"向量维度错误：期望{self.embedding_client.dimensions}维，实际{len(emb)}维")
        
        # 构建插入数据
        data = []
        for i, doc in enumerate(documents):
            data.append([
                doc['doc_id'],
                doc['title'],
                doc['content'],
                embeddings[i]
            ])
        
        self.client.insert(
            table=table_name,
            data=data,
            column_names=['doc_id', 'title', 'content', 'embedding']
        )
        print(f"成功插入 {len(documents)} 条文档，向量已自动生成并写入")
    
    def fulltext_search(self, table_name: str, query: str, top_k: int = 20) -> List[Dict[str, Any]]:
        """
        全文检索，基于BM25算法
        :param table_name: 表名
        :param query: 查询关键词
        :param top_k: 返回结果数量，默认20
        :return: 检索结果，包含doc_id, title, content, bm25_score字段
        """
        search_sql = f"""
        SELECT 
            doc_id, 
            title, 
            content,
            _text_search_score as bm25_score
        FROM {table_name}
        WHERE textSearch(content, %s)
        ORDER BY bm25_score DESC
        LIMIT {top_k}
        """
        results = self.client.query(search_sql, parameters=[query]).result_rows
        return [
            {
                "doc_id": row[0],
                "title": row[1],
                "content": row[2],
                "bm25_score": float(row[3])
            }
            for row in results
        ]
    
    def vector_search(self, table_name: str, query: str, top_k: int = 20) -> List[Dict[str, Any]]:
        """
        向量检索，基于余弦相似度
        :param table_name: 表名
        :param query: 查询文本
        :param top_k: 返回结果数量，默认20
        :return: 检索结果，包含doc_id, title, content, vector_score字段
        """
        # 生成查询向量
        query_embedding = self.embedding_client.embed_text(query)
        
        search_sql = f"""
        SELECT 
            doc_id, 
            title, 
            content,
            cosineDistance(embedding, %s) as vector_score
        FROM {table_name}
        ORDER BY vector_score ASC
        LIMIT {top_k}
        """
        results = self.client.query(search_sql, parameters=[query_embedding]).result_rows
        return [
            {
                "doc_id": row[0],
                "title": row[1],
                "content": row[2],
                "vector_score": float(row[3])
            }
            for row in results
        ]
    
    def rrf_rerank(self, 
                   fulltext_results: List[Dict[str, Any]], 
                   vector_results: List[Dict[str, Any]], 
                   top_k: int = 10,
                   rrf_k: int = 60) -> List[Dict[str, Any]]:
        """
        RRF重排算法，融合全文检索和向量检索结果
        :param fulltext_results: 全文检索结果
        :param vector_results: 向量检索结果
        :param top_k: 返回重排后的结果数量，默认10
        :param rrf_k: RRF算法k参数，默认60
        :return: 重排后的结果，包含rrf_score字段
        """
        # 构建文档分数字典
        doc_scores: Dict[int, Dict[str, Any]] = {}
        
        # 处理全文检索结果
        for rank, result in enumerate(fulltext_results):
            doc_id = result["doc_id"]
            if doc_id not in doc_scores:
                doc_scores[doc_id] = result.copy()
                doc_scores[doc_id]["rrf_score"] = 0.0
            # 累加RRF分数
            doc_scores[doc_id]["rrf_score"] += 1.0 / (rrf_k + rank + 1)
        
        # 处理向量检索结果
        for rank, result in enumerate(vector_results):
            doc_id = result["doc_id"]
            if doc_id not in doc_scores:
                doc_scores[doc_id] = result.copy()
                doc_scores[doc_id]["rrf_score"] = 0.0
            # 累加RRF分数
            doc_scores[doc_id]["rrf_score"] += 1.0 / (rrf_k + rank + 1)
        
        # 按RRF分数排序
        sorted_docs = sorted(doc_scores.values(), key=lambda x: x["rrf_score"], reverse=True)
        
        # 返回top_k结果
        return sorted_docs[:top_k]
    
    def hybrid_search(self, 
                      table_name: str, 
                      query: str, 
                      top_k: int = 10,
                      recall_k: int = 20,
                      rrf_k: int = 60) -> List[Dict[str, Any]]:
        """
        混合检索：全文+向量双路召回 + RRF重排
        :param table_name: 表名
        :param query: 查询文本
        :param top_k: 返回最终结果数量，默认10
        :param recall_k: 每路召回数量，默认20
        :param rrf_k: RRF算法k参数，默认60
        :return: 最终检索结果
        """
        # 两路召回
        fulltext_results = self.fulltext_search(table_name, query, top_k=recall_k)
        vector_results = self.vector_search(table_name, query, top_k=recall_k)
        
        # RRF重排
        reranked_results = self.rrf_rerank(fulltext_results, vector_results, top_k=top_k, rrf_k=rrf_k)
        
        return reranked_results
    
    def close(self) -> None:
        """关闭连接"""
        self.client.close()