Add ISO-8601 coercion support for BigQuery (#23521)

modules/drivers/bigquery-cloud-sdk/src/metabase/driver/bigquery_cloud_sdk/query_processor.clj

@@ -722,3 +722,15 @@
                                                                (if (instance? java.time.temporal.Temporal arg)
                                                                  (->temporal-type field-temporal-type arg)
                                                                  arg)))))))
+
+(defmethod sql.qp/cast-temporal-string [:bigquery-cloud-sdk :Coercion/ISO8601->DateTime]
+  [_driver _semantic_type expr]
+  (hx/->timestamp expr))
+
+(defmethod sql.qp/cast-temporal-string [:bigquery-cloud-sdk :Coercion/ISO8601->Date]
+  [_driver _semantic_type expr]
+  (hx/->date expr))
+
+(defmethod sql.qp/cast-temporal-string [:bigquery-cloud-sdk :Coercion/ISO8601->Time]
+  [_driver _semantic_type expr]
+  (hx/->time expr))

test/metabase/query_processor_test/alternative_date_test.clj

@@ -212,6 +212,16 @@
                   [2 "bar" "2008-10-19 10:23:54" "2008-10-19" "10:23:54"]
                   [3 "baz" "2012-10-19 10:23:54" "2012-10-19" "10:23:54"]]
                  ;; string-times dataset has three text fields, ts, d, t for timestamp, date, and time
+                 (mt/rows (mt/dataset string-times
+                            (qp/process-query
+                              (assoc (mt/mbql-query times)
+                                     :middleware {:format-rows? false}))))))))
+      (testing "bigquery adds UTC"
+        (mt/test-drivers #{:bigquery-cloud-sdk}
+          (is (= [[1 "foo" #t "2004-10-19T10:23:54Z[UTC]" #t "2004-10-19T00:00Z[UTC]" #t "10:23:54"]
+                  [2 "bar" #t "2008-10-19T10:23:54Z[UTC]" #t "2008-10-19T00:00Z[UTC]" #t "10:23:54"]
+                  [3 "baz" #t "2012-10-19T10:23:54Z[UTC]" #t "2012-10-19T00:00Z[UTC]" #t "10:23:54"]]
+                 ;; string-times dataset has three text fields, ts, d, t for timestamp, date, and time
                  (mt/rows (mt/dataset string-times
                             (qp/process-query
                               (assoc (mt/mbql-query times)