update Number class to handle integer values (#8306)

* add show test for json data

* oh changie my changie

* revert unecessary cahnge to fixture

* keep decimal class for precision methods, but return __int__ value

* jerco updates

* update integer type

* update other tests

* Update .changes/unreleased/Fixes-20230803-093502.yaml

---------

Co-authored-by: Emily Rockman <emily.rockman@dbtlabs.com>

.changes/unreleased/Fixes-20230803-093502.yaml

@@ -0,0 +1,6 @@
+kind: Fixes
+body: Add explicit support for integers for the show command
+time: 2023-08-03T09:35:02.163968-05:00
+custom:
+  Author: dave-connors-3
+  Issue: "8153"

core/dbt/clients/agate_helper.py

@@ -9,10 +9,20 @@
 
 from dbt.exceptions import DbtRuntimeError
 
-
 BOM = BOM_UTF8.decode("utf-8")  # '\ufeff'
 
 
+class Integer(agate.data_types.DataType):
+    def cast(self, d):
+        if type(d) == int:
+            return d
+        else:
+            raise agate.exceptions.CastError('Can not parse value "%s" as Integer.' % d)
+
+    def jsonify(self, d):
+        return d
+
+
 class Number(agate.data_types.Number):
     # undo the change in https://github.com/wireservice/agate/pull/733
     # i.e. do not cast True and False to numeric 1 and 0
@@ -48,6 +58,7 @@ def build_type_tester(
 ) -> agate.TypeTester:
 
     types = [
+        Integer(null_values=("null", "")),
         Number(null_values=("null", "")),
         agate.data_types.Date(null_values=("null", ""), date_format="%Y-%m-%d"),
         agate.data_types.DateTime(null_values=("null", ""), datetime_format="%Y-%m-%d %H:%M:%S"),

tests/functional/show/fixtures.py

@@ -2,6 +2,14 @@
 select * from {{ ref('sample_seed') }}
 """
 
+models__sample_number_model = """
+select
+  cast(1.0 as int) as float_to_int_field,
+  3.0 as float_field,
+  4.3 as float_with_dec_field,
+  5 as int_field
+"""
+
 models__second_model = """
 select
     sample_num as col_one,

tests/functional/show/test_show.py

@@ -6,6 +6,7 @@
     models__second_ephemeral_model,
     seeds__sample_seed,
     models__sample_model,
+    models__sample_number_model,
     models__second_model,
     models__ephemeral_model,
     schema_yml,
@@ -19,6 +20,7 @@ class TestShow:
     def models(self):
         return {
             "sample_model.sql": models__sample_model,
+            "sample_number_model.sql": models__sample_number_model,
             "second_model.sql": models__second_model,
             "ephemeral_model.sql": models__ephemeral_model,
             "sql_header.sql": models__sql_header,
@@ -62,6 +64,19 @@ def test_select_single_model_json(self, project):
         assert "sample_num" in log_output
         assert "sample_bool" in log_output
 
+    def test_numeric_values(self, project):
+        run_dbt(["build"])
+        (results, log_output) = run_dbt_and_capture(
+            ["show", "--select", "sample_number_model", "--output", "json"]
+        )
+        assert "Previewing node 'sample_number_model'" not in log_output
+        assert "1.0" not in log_output
+        assert "1" in log_output
+        assert "3.0" in log_output
+        assert "4.3" in log_output
+        assert "5" in log_output
+        assert "5.0" not in log_output
+
     def test_inline_pass(self, project):
         run_dbt(["build"])
         (results, log_output) = run_dbt_and_capture(

tests/unit/test_agate_helper.py

@@ -121,37 +121,37 @@ def test_datetime_formats(self):
             self.assertEqual(tbl[0][0], expected)
 
     def test_merge_allnull(self):
-        t1 = agate.Table([(1, "a", None), (2, "b", None)], ("a", "b", "c"))
-        t2 = agate.Table([(3, "c", None), (4, "d", None)], ("a", "b", "c"))
+        t1 = agate_helper.table_from_rows([(1, "a", None), (2, "b", None)], ("a", "b", "c"))
+        t2 = agate_helper.table_from_rows([(3, "c", None), (4, "d", None)], ("a", "b", "c"))
         result = agate_helper.merge_tables([t1, t2])
         self.assertEqual(result.column_names, ("a", "b", "c"))
-        assert isinstance(result.column_types[0], agate.data_types.Number)
+        assert isinstance(result.column_types[0], agate_helper.Integer)
         assert isinstance(result.column_types[1], agate.data_types.Text)
         assert isinstance(result.column_types[2], agate.data_types.Number)
         self.assertEqual(len(result), 4)
 
     def test_merge_mixed(self):
-        t1 = agate.Table([(1, "a", None), (2, "b", None)], ("a", "b", "c"))
-        t2 = agate.Table([(3, "c", "dog"), (4, "d", "cat")], ("a", "b", "c"))
-        t3 = agate.Table([(3, "c", None), (4, "d", None)], ("a", "b", "c"))
+        t1 = agate_helper.table_from_rows([(1, "a", None), (2, "b", None)], ("a", "b", "c"))
+        t2 = agate_helper.table_from_rows([(3, "c", "dog"), (4, "d", "cat")], ("a", "b", "c"))
+        t3 = agate_helper.table_from_rows([(3, "c", None), (4, "d", None)], ("a", "b", "c"))
 
         result = agate_helper.merge_tables([t1, t2])
         self.assertEqual(result.column_names, ("a", "b", "c"))
-        assert isinstance(result.column_types[0], agate.data_types.Number)
+        assert isinstance(result.column_types[0], agate_helper.Integer)
         assert isinstance(result.column_types[1], agate.data_types.Text)
         assert isinstance(result.column_types[2], agate.data_types.Text)
         self.assertEqual(len(result), 4)
 
         result = agate_helper.merge_tables([t2, t3])
         self.assertEqual(result.column_names, ("a", "b", "c"))
-        assert isinstance(result.column_types[0], agate.data_types.Number)
+        assert isinstance(result.column_types[0], agate_helper.Integer)
         assert isinstance(result.column_types[1], agate.data_types.Text)
         assert isinstance(result.column_types[2], agate.data_types.Text)
         self.assertEqual(len(result), 4)
 
         result = agate_helper.merge_tables([t1, t2, t3])
         self.assertEqual(result.column_names, ("a", "b", "c"))
-        assert isinstance(result.column_types[0], agate.data_types.Number)
+        assert isinstance(result.column_types[0], agate_helper.Integer)
         assert isinstance(result.column_types[1], agate.data_types.Text)
         assert isinstance(result.column_types[2], agate.data_types.Text)
         self.assertEqual(len(result), 6)
@@ -191,7 +191,7 @@ def test_nocast_bool_01(self):
         self.assertEqual(len(tbl), len(result_set))
 
         assert isinstance(tbl.column_types[0], agate.data_types.Boolean)
-        assert isinstance(tbl.column_types[1], agate.data_types.Number)
+        assert isinstance(tbl.column_types[1], agate_helper.Integer)
 
         expected = [
             [True, Decimal(1)],