community[patch], langchain[minor]: Enhance Tencent Cloud VectorDB, langchain: make Tencent Cloud VectorDB self query retrieve compatible (#19651)

- make Tencent Cloud VectorDB support metadata filtering.
- implement delete function for Tencent Cloud VectorDB.
- support both Langchain Embedding model and Tencent Cloud VDB embedding
model.
- Tencent Cloud VectorDB support filter search keyword, compatible with
langchain filtering syntax.
- add Tencent Cloud VectorDB TranslationVisitor, now work with self
query retriever.
- more documentations.

---------

Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>

libs/community/tests/unit_tests/vectorstores/test_indexing_docs.py

@@ -82,6 +82,7 @@ def test_compatible_vectorstore_documentation() -> None:
         "SurrealDBStore",
         "TileDB",
         "TimescaleVector",
+        "TencentVectorDB",
         "EcloudESVectorStore",
         "Vald",
         "VDMS",

libs/community/tests/unit_tests/vectorstores/test_tencentvectordb.py

@@ -0,0 +1,43 @@
+import importlib.util
+
+from langchain_community.vectorstores.tencentvectordb import translate_filter
+
+
+def test_translate_filter() -> None:
+    raw_filter = (
+        'and(or(eq("artist", "Taylor Swift"), '
+        'eq("artist", "Katy Perry")), lt("length", 180))'
+    )
+    try:
+        importlib.util.find_spec("langchain.chains.query_constructor.base")
+        translate_filter(raw_filter)
+    except ModuleNotFoundError:
+        try:
+            translate_filter(raw_filter)
+        except ModuleNotFoundError:
+            pass
+        else:
+            assert False
+    else:
+        result = translate_filter(raw_filter)
+        expr = '(artist = "Taylor Swift" or artist = "Katy Perry") ' "and length < 180"
+        assert expr == result
+
+
+def test_translate_filter_with_in_comparison() -> None:
+    raw_filter = 'in("artist", ["Taylor Swift", "Katy Perry"])'
+
+    try:
+        importlib.util.find_spec("langchain.chains.query_constructor.base")
+        translate_filter(raw_filter)
+    except ModuleNotFoundError:
+        try:
+            translate_filter(raw_filter)
+        except ModuleNotFoundError:
+            pass
+        else:
+            assert False
+    else:
+        result = translate_filter(raw_filter)
+        expr = 'artist in ("Taylor Swift", "Katy Perry")'
+        assert expr == result