Github user njayaram2 commented on a diff in the pull request:
https://github.com/apache/incubator-madlib/pull/80#discussion_r92717819
--- Diff: src/ports/postgres/modules/knn/knn.py_in ---
@@ -0,0 +1,36 @@
+# coding=utf-8
+m4_changequote(`<!', `!>')
+
+"""
+@file knn.py_in
+
+@brief knn: Driver functions
+
+@namespace knn
+
+@brief knn: Driver functions
+"""
+
+import plpy
+
+#from utilities.control import IterationController2D
+#from utilities.control_composite import IterationControllerComposite
+from utilities.validate_args import table_exists
+from utilities.validate_args import table_is_empty
+
+STATE_IN_MEM = m4_ifdef(<!__HAWQ__!>, <!True!>, <!False!>)
+HAS_FUNCTION_PROPERTIES = m4_ifdef(<!__HAS_FUNCTION_PROPERTIES__!>,
<!True!>, <!False!>)
+UDF_ON_SEGMENT_NOT_ALLOWED = m4_ifdef(<!__UDF_ON_SEGMENT_NOT_ALLOWED__!>,
<!True!>, <!False!>)
+# ----------------------------------------------------------------------
+
+
+def knn_validate_src(schema_madlib, rel_source, **kwargs):
+ if rel_source is None or rel_source.strip().lower() in ('null', ''):
--- End diff --
I guess you can replace this with `if not rel_source:`
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