Fix filtering by minutes on Postgres [ci drivers]

src/metabase/driver/postgres.clj

@@ -114,8 +114,8 @@
     :seconds      (hsql/call :to_timestamp expr)
     :milliseconds (recur (hx// expr 1000) :seconds)))
 
-(defn- date-trunc [unit expr] (hsql/call :date_trunc (hx/literal unit) expr))
-(defn- extract    [unit expr] (hsql/call :extract    unit              expr))
+(defn- date-trunc [unit expr] (hsql/call :date_trunc (hx/literal unit) (hx/cast :timestamp expr)))
+(defn- extract    [unit expr] (hsql/call :extract    unit              (hx/cast :timestamp expr)))
 
 (def ^:private extract-integer (comp hx/->integer extract))
 

test/metabase/query_processor_test/filter_test.clj

@@ -343,3 +343,11 @@
                                           (ql/aggregation (ql/count))
                                           (ql/filter (ql/and (ql/not (ql/> $id 32))
                                                              (ql/contains $name "BBQ")))))))
+
+
+;; make sure that filtering with dates truncating to minutes works (#4632)
+(expect-with-non-timeseries-dbs [107] (first-row
+                                        (format-rows-by [int]
+                                          (data/run-query checkins
+                                            (ql/aggregation (ql/count))
+                                            (ql/filter (ql/between (ql/datetime-field $date :minute) "2015-01-01T12:30:00" "2015-05-31"))))))