Simplified Psycopg 2 code

Author: ankane

pgvector/psycopg2/halfvec.py

@@ -11,7 +11,9 @@ def getquoted(self) -> bytes:
 
 
 def cast_halfvec(value: str | None, cur: cursor) -> HalfVector | None:
-    return HalfVector._from_db(value)
+    if value is None:
+        return None
+    return HalfVector.from_text(value)
 
 
 def register_halfvec_info(oid: int, array_oid: int | None, scope: connection | cursor | None) -> None:

pgvector/psycopg2/sparsevec.py

@@ -11,7 +11,9 @@ def getquoted(self) -> bytes:
 
 
 def cast_sparsevec(value: str | None, cur: cursor) -> SparseVector | None:
-    return SparseVector._from_db(value)
+    if value is None:
+        return None
+    return SparseVector.from_text(value)
 
 
 def register_sparsevec_info(oid: int, array_oid: int | None, scope: connection | cursor | None) -> None:

pgvector/psycopg2/vector.py

@@ -11,7 +11,9 @@ def getquoted(self) -> bytes:
 
 
 def cast_vector(value: str | None, cur: cursor) -> Vector | None:
-    return Vector._from_db(value)
+    if value is None:
+        return None
+    return Vector.from_text(value)
 
 
 def register_vector_info(oid: int, array_oid: int | None, scope: connection | cursor | None) -> None: