feat: support GRAPH and pipe syntax in dbapi (#1285)

Recognize GRAPH and pipe syntax queries as valid queries
in dbapi.

Author: olavloite

google/cloud/spanner_dbapi/parse_utils.py

@@ -155,7 +155,7 @@
 STMT_INSERT = "INSERT"
 
 # Heuristic for identifying statements that don't need to be run as updates.
-RE_NON_UPDATE = re.compile(r"^\W*(SELECT)", re.IGNORECASE)
+RE_NON_UPDATE = re.compile(r"^\W*(SELECT|GRAPH|FROM)", re.IGNORECASE)
 
 RE_WITH = re.compile(r"^\s*(WITH)", re.IGNORECASE)
 

tests/unit/spanner_dbapi/test_parse_utils.py

@@ -39,6 +39,11 @@ def test_classify_stmt(self):
                 "WITH sq AS (SELECT SchoolID FROM Roster) SELECT * from sq",
                 StatementType.QUERY,
             ),
+            (
+                "GRAPH FinGraph MATCH (n) RETURN LABELS(n) AS label, n.id",
+                StatementType.QUERY,
+            ),
+            ("FROM Produce |> WHERE item != 'bananas'", StatementType.QUERY),
             (
                 "CREATE TABLE django_content_type (id STRING(64) NOT NULL, name STRING(100) "
                 "NOT NULL, app_label STRING(100) NOT NULL, model STRING(100) NOT NULL) PRIMARY KEY(id)",