Remove filter (kb_id) in infinity (#12853)

Secondary indexes in infinity do not support **IN** expr

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Signed-off-by: zpf121 <1219290549@qq.com>

rag/utils/infinity_conn.py

@@ -147,6 +147,9 @@ class InfinityConnection(InfinityConnectionBase):
         filter_cond = None
         filter_fulltext = ""
         if condition:
+            # Remove kb_id filter for Infinity (it uses table separation instead)
+            condition = {k: v for k, v in condition.items() if k != "kb_id"}
+
             table_found = False
             for indexName in index_names:
                 if indexName.startswith("ragflow_doc_meta_"):