Bug 1451907 - Add default_search_engine column to search aggregates (#230)

Author: wlach

mozetl/search/aggregates.py

@@ -98,6 +98,7 @@ def search_aggregates(main_summary):
             'search_cohort',
             'source',
             'submission_date',
+            'default_search_engine',
         ],
         []
     ).where(col('engine').isNotNull())

tests/test_search_aggregates.py

@@ -252,6 +252,7 @@ def expected_search_dashboard_data(define_dataframe_factory):
         ('app_version', '54.0.1', StringType(), True),
         ('distribution_id', None, StringType(), True),
         ('addon_version', '0.9.5', StringType(), False),
+        ('default_search_engine', 'google', StringType(), False),
         ('engine', 'google', StringType(), False),
         ('source', 'urlbar', StringType(), False),
         ('tagged-sap', None, LongType(), True),