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### What problem does this PR solve? Fixed 12787 with syntax error in generated MySql json path expression https://github.com/infiniflow/ragflow/issues/12787 ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue) #### What was fixed: - Changed line 237 in ob_conn.py from value_str = get_value_str(value) if value else "" to value_str = get_value_str(value) - This fixes the bug where falsy but valid values (0, False, "", [], {}) were being converted to empty strings, causing invalid SQL syntax #### What was tested: - Comprehensive unit tests covering all edge cases - Regression tests specifically for the bug scenario --------- Co-authored-by: Kevin Hu <kevinhu.sh@gmail.com>