Refactor UDF server and external function type system

singlestoredb/config.py

@@ -407,6 +407,18 @@
     environ=['SINGLESTOREDB_EXT_FUNC_LOG_LEVEL'],
 )
 
+register_option(
+    'external_function.name_prefix', 'string', check_str, '',
+    'Prefix to add to external function names.',
+    environ=['SINGLESTOREDB_EXT_FUNC_NAME_PREFIX'],
+)
+
+register_option(
+    'external_function.name_suffix', 'string', check_str, '',
+    'Suffix to add to external function names.',
+    environ=['SINGLESTOREDB_EXT_FUNC_NAME_SUFFIX'],
+)
+
 register_option(
     'external_function.connection', 'string', check_str,
     os.environ.get('SINGLESTOREDB_URL') or None,
@@ -415,7 +427,7 @@
 )
 
 register_option(
-    'external_function.host', 'string', check_str, '127.0.0.1',
+    'external_function.host', 'string', check_str, 'localhost',
     'Specifies the host to bind the server to.',
     environ=['SINGLESTOREDB_EXT_FUNC_HOST'],
 )

singlestoredb/functions/__init__.py

@@ -1,2 +1,6 @@
 from .decorator import tvf  # noqa: F401
+from .decorator import tvf_with_null_masks  # noqa: F401
 from .decorator import udf  # noqa: F401
+from .decorator import udf_with_null_masks  # noqa: F401
+from .typing import Masked  # noqa: F401
+from .typing import MaskedNDArray  # noqa: F401