tidying up examples and readme

examples/athena_basic_query.py

@@ -3,37 +3,31 @@ import pprint
 
 pp = pprint.PrettyPrinter(indent=4)
 
+# Create the Minerva object which gives you access to the account under the
+# profile `hay`
 m = minerva.Minerva("hay")
+
+# Get the Athena object
 athena = m.athena("s3://haystac-pmo-athena/")
 
-#query  = athena.query(
-#"""SELECT *
-#FROM trajectories.kitware
-#WHERE ST_Disjoint(
-#  ST_GeometryFromText('POLYGON((103.6 1.2151693, 103.6 1.5151693, 104.14797 1.5151693, 104.14797 1.2151693, 103.6 1.2151693))'),
-#  ST_Point(longitude, latitude)
-#)
-#""")
-
-# Everything *needs* to have a column in order for parquet to work, so scalar
-# values have to be assigned something, so here we use `as count` to create
-# a temporary column called `count`
-#print(athena.query("select count(*) as count from trajectories.kitware").results().head(1))
-
+# Everything *needs* to have a column in order for unloading to parquet to work,
+# so scalar values have to be assigned something, so here we use `as count` to
+# create a temporary column called `count`
 query  = athena.query(
     """
     select round(longitude, 3) as lon, count(*) as count
-    from trajectories.kitware
+    from trajectories.baseline
     where agent = 4
     group by round(longitude, 3)
     order by count(*) desc
     """
 )
 data   = query.results()
+
 pp.pprint(data.head(10))
+
+# We also get important statistics
 print(query.runtime)
-
-#import IPython
-#IPython.embed()
+print(query.cost)