fixup! fixup! EP-3251 #116 #108 #124 added todo notes

openeo/rest/datacube.py

@@ -1,5 +1,6 @@
 import copy
 import datetime
+import logging
 import pathlib
 import typing
 from typing import List, Dict, Union, Tuple
@@ -19,6 +20,10 @@
     # Note: the `hasattr` check is necessary for Python versions before 3.5.2.
     from openeo.rest.connection import Connection
 
+
+log = logging.getLogger(__name__)
+
+
 # TODO #108 this file is still full of "ImageCollection" references (type hints, docs, isinstance checks, ...)
 
 class DataCube(ImageCollection):
@@ -310,6 +315,7 @@ def __lt__(self, other: Union[ImageCollection, Union[int, float]]):
     def _create_reduced_collection(self, callback_graph_builder, extend_previous_callback_graph):
         if not extend_previous_callback_graph:
             # there was no previous reduce step
+            log.warning("Doing band math without proper `DataCube.band()` usage. There is probably something wrong. See issue #123")
             args = {
                 'data': {'from_node': self.builder.result_node},
                 # TODO: avoid hardcoded dimension name 'spectral_bands' #116