Fix columns reading for queries with double INNER JOIN (#583)

Resolves #580

Author: macbre

sql_metadata/keywords_lists.py

@@ -65,6 +65,7 @@
     "INTO": "insert",
     "SET": "update",
     "GROUPBY": "group_by",
+    "INNERJOIN": "inner_join",
 }
 
 

test/test_getting_columns.py

@@ -528,3 +528,16 @@ def test_nested_queries():
     parser = Parser(query)
     assert parser.columns == ["dt"]
     assert parser.columns_dict == {"select": ["dt"]}
+
+
+def test_double_inner_join():
+    query = """
+    SELECT loan.loan_id, district.a3 AS district, district.a11 AS average_salary
+        FROM loan
+        INNER JOIN account ON loan.account_id = account.account_id
+        INNER JOIN district ON account.district_id = district.district_id WHERE loan.duration = 60
+    """
+
+    parser = Parser(query)
+    assert "loan.account_id" in parser.columns
+    assert parser.tables == ["loan", "account"]