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35 lines
1.6 KiB
Go
35 lines
1.6 KiB
Go
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//
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// Copyright 2026 The InfiniFlow Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Package serenedb implements the doc-store DocEngine backed by SereneDB, a
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// PostgreSQL-wire engine whose single inverted index carries both a scored
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// text column (@@, BM25) and an IVF vector column (<#>, inner product), so
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// hybrid search is one SQL statement. It connects with database/sql + lib/pq
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// and emits SQL directly; the query shapes mirror the Python
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// SereneDBConnection (rag/utils/serenedb_conn.py) that reached Elasticsearch
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// retrieval parity.
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//
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// Table layout follows the Elasticsearch/OceanBase model: one chunk table per
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// tenant (the index name) with kb_id as a filter column, so BM25 statistics are
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// computed over the whole tenant corpus. Metadata is one table per tenant
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// (ragflow_doc_meta_{tenantID}).
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//
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// Minimum engine version: SereneDB 26.07.4. The vector-branch and fusion
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// queries use the natural forms that rely on the 26.07.4 fixes for the
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// vector-op predicate in an ANN scan's WHERE and the multi-reference index
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// CTE; on earlier builds both silently returned empty.
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package serenedb
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