fix: remove leading whitespaces on post-hook operations (#705)

Author: sanromeo

dbt/adapters/athena/query_headers.py

@@ -25,6 +25,7 @@ def add(self, sql: str) -> str:
 
         # alter or vacuum statements don't seem to support properly query comments
         # let's just exclude them
+        sql = sql.lstrip()
         if any(sql.lower().startswith(keyword) for keyword in ["alter", "drop", "optimize", "vacuum", "msck"]):
             return sql
 

tests/unit/test_query_headers.py

@@ -74,3 +74,15 @@ def test_no_query_comment_on_msck(self):
         self.query_header.comment.append = True
         sql = "MSCK REPAIR TABLE"
         assert self.query_header.add(sql) == sql
+
+    def test_no_query_comment_on_vacuum_with_leading_whitespaces(self):
+        self.query_header.comment.query_comment = "executed by dbt"
+        self.query_header.comment.append = True
+        sql = "    VACUUM table"
+        assert self.query_header.add(sql) == "VACUUM table"
+
+    def test_no_query_comment_on_vacuum_with_lowercase(self):
+        self.query_header.comment.query_comment = "executed by dbt"
+        self.query_header.comment.append = True
+        sql = "vacuum table"
+        assert self.query_header.add(sql) == sql