Fix bug #2731 on stripping query comments for snowflake

CHANGELOG.md

@@ -2,9 +2,11 @@
 
 ### Features
 - Add optional configs for `require_partition_filter` and `partition_expiration_days` in BigQuery ([#1843](https://github.com/fishtown-analytics/dbt/issues/1843), [#2928](https://github.com/fishtown-analytics/dbt/pull/2928))
+- Fix for EOL SQL comments prevent entire line execution ([#2731](https://github.com/fishtown-analytics/dbt/issues/2731), [#2974](https://github.com/fishtown-analytics/dbt/pull/2974))
 
 Contributors:
 - [@yu-iskw](https://github.com/yu-iskw) ([#2928](https://github.com/fishtown-analytics/dbt/pull/2928))
+- [@rvacaru](https://github.com/rvacaru) ([#2974](https://github.com/fishtown-analytics/dbt/pull/2974))
 
 ## dbt 0.19.0 (Release TBD)
 
@@ -936,7 +938,6 @@ Thanks for your contributions to dbt!
 - [@bastienboutonnet](https://github.com/bastienboutonnet) ([#1591](https://github.com/fishtown-analytics/dbt/pull/1591), [#1689](https://github.com/fishtown-analytics/dbt/pull/1689))
 
 
-
 ## dbt 0.14.0 - Wilt Chamberlain (July 10, 2019)
 
 ### Overview

plugins/snowflake/dbt/adapters/snowflake/connections.py

@@ -305,7 +305,9 @@ def add_query(self, sql, auto_begin=True,
             # empty queries. this avoids using exceptions as flow control,
             # and also allows us to return the status of the last cursor
             without_comments = re.sub(
-                re.compile('^.*(--.*)$', re.MULTILINE),
+                re.compile(
+                    r'(\".*?\"|\'.*?\')|(/\*.*?\*/|--[^\r\n]*$)', re.MULTILINE
+                ),
                 '', individual_query).strip()
 
             if without_comments == "":

test/unit/test_snowflake_adapter.py

@@ -1,4 +1,5 @@
 import agate
+import re
 import unittest
 from contextlib import contextmanager
 from unittest import mock
@@ -523,3 +524,48 @@ def test_float_from_description(self):
         assert col.is_numeric() is False
         assert col.is_string() is False
         assert col.is_integer() is False
+
+
+class SnowflakeConnectionsTest(unittest.TestCase):
+    def test_comment_stripping_regex(self):
+        pattern = r'(\".*?\"|\'.*?\')|(/\*.*?\*/|--[^\r\n]*$)'
+        comment1 = '-- just comment'
+        comment2 = '/* just comment */'
+        query1 = 'select 1; -- comment'
+        query2 = 'select 1; /* comment */'
+        query3 = 'select 1; -- comment\nselect 2; /* comment */ '
+        query4 = 'select \n1; -- comment\nselect \n2; /* comment */ '
+        query5 = 'select 1; -- comment \nselect 2; -- comment \nselect 3; -- comment'
+
+        stripped_comment1 = re.sub(re.compile(pattern, re.MULTILINE),
+                                   '', comment1).strip()
+
+        stripped_comment2 = re.sub(re.compile(pattern, re.MULTILINE),
+                                   '', comment2).strip()
+
+        stripped_query1 = re.sub(re.compile(pattern, re.MULTILINE),
+                                 '', query1).strip()
+
+        stripped_query2 = re.sub(re.compile(pattern, re.MULTILINE),
+                                 '', query2).strip()
+
+        stripped_query3 = re.sub(re.compile(pattern, re.MULTILINE),
+                                 '', query3).strip()
+
+        stripped_query4 = re.sub(re.compile(pattern, re.MULTILINE),
+                                 '', query4).strip()
+
+        stripped_query5 = re.sub(re.compile(pattern, re.MULTILINE),
+                                 '', query5).strip()
+
+        expected_query_3 = 'select 1; \nselect 2;'
+        expected_query_4 = 'select \n1; \nselect \n2;'
+        expected_query_5 = 'select 1; \nselect 2; \nselect 3;'
+
+        self.assertEqual('', stripped_comment1)
+        self.assertEqual('', stripped_comment2)
+        self.assertEqual('select 1;', stripped_query1)
+        self.assertEqual('select 1;', stripped_query2)
+        self.assertEqual(expected_query_3, stripped_query3)
+        self.assertEqual(expected_query_4, stripped_query4)
+        self.assertEqual(expected_query_5, stripped_query5)