Better Handling of Non Aggregatable Fields (#85)

* updates ecommerce mapping to include non-aggregatable text field

* updates exists tests and adds new tests for non-aggregatable field

* better handling on non-aggregatable fields

* fixes formatting

* swaps series in assertion

* adds newline

eland/mappings.py

@@ -373,7 +373,11 @@ class Mappings:
             aggregatable: bool
                 Is the field aggregatable in Elasticsearch?
         """
-        return self._mappings_capabilities.loc[field_name]
+        try:
+            field_capabilities = self._mappings_capabilities.loc[field_name]
+        except KeyError:
+            field_capabilities = pd.Series()
+        return field_capabilities
 
     def get_date_field_format(self, field_name):
         """
@@ -447,9 +451,7 @@ class Mappings:
         """
         if field_names is None:
             field_names = self.source_fields()
-
         aggregatables = {}
-
         for field_name in field_names:
             capabilities = self.field_capabilities(field_name)
             if capabilities['aggregatable']:
@@ -458,11 +460,11 @@ class Mappings:
                 # Try 'field_name.keyword'
                 field_name_keyword = field_name + '.keyword'
                 capabilities = self.field_capabilities(field_name_keyword)
-                if capabilities['aggregatable']:
+                if not capabilities.empty and capabilities.get('aggregatable'):
                     aggregatables[field_name_keyword] = field_name
-                else:
-                    # Aggregations not supported for this field
-                    raise ValueError("Aggregations not supported for ", field_name)
+
+        if not aggregatables:
+            raise ValueError("Aggregations not supported for ", field_name)
 
         return aggregatables
 

eland/operations.py

@@ -249,7 +249,7 @@ class Operations:
         results = {}
 
         for key, value in aggregatable_field_names.items():
-            for bucket in response['aggregations'][field_names[0]]['buckets']:
+            for bucket in response['aggregations'][key]['buckets']:
                 results[bucket['key']] = bucket['doc_count']
 
         try:

eland/series.py

@@ -1051,7 +1051,10 @@ class Series(NDFrame):
 
             else:
                 # TODO - support limited ops on strings https://github.com/elastic/eland/issues/65
-                raise TypeError("Unsupported operation: '{}' {} '{}'".format(self._dtype, method_name, right._dtype))
+                raise TypeError(
+                    "unsupported operation type(s) ['{}'] for operands ['{}' with dtype '{}', '{}']"
+                    .format(method_name, type(self), self._dtype, type(right).__name__)
+                )
 
         # check left number and right numeric series
         elif np.issubdtype(np.dtype(type(right)), np.number) and np.issubdtype(self._dtype, np.number):
@@ -1085,7 +1088,8 @@ class Series(NDFrame):
         else:
             # TODO - support limited ops on strings https://github.com/elastic/eland/issues/65
             raise TypeError(
-                "unsupported operand type(s) for '{}' {} '{}'".format(type(self), method_name, type(right))
+                "unsupported operation type(s) ['{}'] for operands ['{}' with dtype '{}', '{}']"
+                .format(method_name, type(self), self._dtype, type(right).__name__)
             )
 
     def _numeric_rop(self, left, method_name, op_type=None):
@@ -1127,7 +1131,8 @@ class Series(NDFrame):
         else:
             # TODO - support limited ops on strings https://github.com/elastic/eland/issues/65
             raise TypeError(
-                "unsupported operand type(s) for '{}' {} '{}'".format(type(self), method_name, type(left))
+                "unsupported operation type(s) ['{}'] for operands ['{}' with dtype '{}', '{}']"
+                .format(op_method_name, type(self), self._dtype, type(left).__name__)
             )
 
     def max(self):

eland/tests/__init__.py

@@ -147,7 +147,7 @@ ECOMMERCE_MAPPING = {"mappings": {
             }
         },
         "customer_gender": {
-            "type": "keyword"
+            "type": "text"
         },
         "customer_id": {
             "type": "keyword"

eland/tests/dataframe/test_nunique_pytest.py

@@ -22,7 +22,7 @@ class TestDataFrameNUnique(TestData):
         # assert_series_equal(pd_nunique, ed_nunique)
 
     def test_ecommerce_nunique(self):
-        columns = ['customer_first_name', 'customer_gender', 'day_of_week_i']
+        columns = ['customer_first_name', 'customer_last_name', 'day_of_week_i']
         pd_ecommerce = self.pd_ecommerce()[columns]
         ed_ecommerce = self.ed_ecommerce()[columns]
 

eland/tests/mappings/test_aggregatables_pytest.py

@@ -15,7 +15,6 @@ class TestMappingsAggregatables(TestData):
                     'customer_birth_date': 'customer_birth_date',
                     'customer_first_name.keyword': 'customer_first_name',
                     'customer_full_name.keyword': 'customer_full_name',
-                    'customer_gender': 'customer_gender',
                     'customer_id': 'customer_id',
                     'customer_last_name.keyword': 'customer_last_name',
                     'customer_phone': 'customer_phone',

eland/tests/series/test_str_arithmetics_pytest.py

@@ -38,3 +38,19 @@ class TestSeriesArithmetics(TestData):
         pdadd = "The last name is: " + self.pd_ecommerce()['customer_last_name']
 
         assert_pandas_eland_series_equal(pdadd, edadd)
+
+    def test_non_aggregatable_add_str(self):
+        with pytest.raises(ValueError):
+            assert self.ed_ecommerce()['customer_gender'] + "is the gender"
+
+    def teststr_add_non_aggregatable(self):
+        with pytest.raises(ValueError):
+            assert "The gender is: " + self.ed_ecommerce()['customer_gender']
+
+    def test_non_aggregatable_add_aggregatable(self):
+        with pytest.raises(ValueError):
+            assert self.ed_ecommerce()['customer_gender'] + self.ed_ecommerce()['customer_first_name']
+
+    def test_aggregatable_add_non_aggregatable(self):
+            with pytest.raises(ValueError):
+                assert self.ed_ecommerce()['customer_first_name'] + self.ed_ecommerce()['customer_gender']

eland/tests/series/test_value_counts_pytest.py

@@ -45,3 +45,8 @@ class TestSeriesValueCounts(TestData):
         ed_s = self.ed_flights()['Carrier']
         with pytest.raises(ValueError):
             assert ed_s.value_counts(es_size=-9)
+
+    def test_value_counts_non_aggregatable(self):
+        ed_s = self.ed_ecommerce()['customer_gender']
+        with pytest.raises(ValueError):
+            assert ed_s.value_counts()