diff --git a/analyse_properties/debug.py b/analyse_properties/debug.py
new file mode 100644
index 0000000..ab44457
--- /dev/null
+++ b/analyse_properties/debug.py
@@ -0,0 +1,24 @@
+import apache_beam as beam
+
+
+class DebugShowEmptyColumn(beam.DoFn):
+    def __init__(self, index):
+        self.index = index
+
+    def process(self, element):
+        column = element[self.index]
+        if len(column) == 0:
+            yield element
+        return None
+
+
+class DebugShowColumnWithValueIn(beam.DoFn):
+    def __init__(self, index, value):
+        self.index = index
+        self.value = value
+
+    def process(self, element):
+        column = element[self.index]
+        if self.value in column:
+            yield element
+        return None