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### What problem does this PR solve? ## Summary Fixes #5939 Entity names containing single quotes (e.g., `投影直线L'`) caused SQL syntax errors when building filter conditions for Infinity queries, due to unescaped string interpolation in `equivalent_condition_to_str`. ## Changes In `common/doc_store/infinity_conn_base.py`, added `.replace("'", "''")` escaping for string values in two branches of `equivalent_condition_to_str` where it was missing: 1. **`field_keyword` branch with non-list value** (line 190): The list branch already escaped single quotes on line 183, but the single-string branch did not. 2. **Plain string value branch** (line 209): Direct f-string interpolation `{k}='{v}'` was vulnerable to unescaped quotes. Both fixes use the same SQL-standard escape pattern (`'` → `''`) already applied elsewhere in this method. ## How to Test 1. Upload a document containing entity names with single quotes. 2. Enable Knowledge Graph (GraphRAG) in the parsing configuration. 3. Initiate document parsing — it should complete without SQL syntax errors. ## Note The original issue also reported a typo (`dge_graph_kwd` instead of `knowledge_graph_kwd`), which has already been fixed in the current codebase. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) --------- Signed-off-by: noob <yixiao121314@outlook.com>