generic sql driver implementation of Field metadata

src/metabase/driver/generic_sql/metadata.clj

+(ns metabase.driver.generic-sql.metadata)
+
+;; TODO - These implementations are wack. We should just use korma to do this instead of raw SQL
+
+(defn field-count
+  [{:keys [db table name] :as field}]
+  (-> ((:native-query @db)
+       (format "SELECT COUNT(\"%s\".\"%s\") FROM \"%s\""
+               (:name (table))
+               name
+               (:name (table))))
+      first
+      :count))
+
+(defn field-distinct-count
+  [{:keys [db table name] :as field}]
+  (-> ((:native-query @db)
+       (format "SELECT COUNT(DISTINCT \"%s\".\"%s\") FROM \"%s\""
+               (:name (table))
+               name
+               (:name (table))))
+      first
+      :count))

src/metabase/driver/h2/metadata.clj

+(ns metabase.driver.h2.metadata
+  (:require [metabase.driver.generic-sql.metadata :as generic]
+            [metabase.driver.metadata :as driver]))
+
+(defmethod driver/field-count :h2 [field]
+  (generic/field-count field))
+
+(defmethod driver/field-distinct-count :h2 [field]
+  (generic/field-distinct-count field))

src/metabase/driver/postgres/metadata.clj

 (ns metabase.driver.postgres.metadata
-  (:require [metabase.driver.metadata :refer [field-count field-distinct-count]]))
+  (:require [metabase.driver.generic-sql.metadata :as generic]
+            [metabase.driver.metadata :as driver]))
 
-;; TODO - These implementations are wack. We should just use korma to do this
-;; and these should be moved to the `generic-sql` driver
+(defmethod driver/field-count :postgres [field]
+  (generic/field-count field))
 
-(defmethod field-count :postgres
-  [{:keys [db table name] :as field}]
-  (-> ((:native-query @db)
-       (format "SELECT COUNT(\"%s\".\"%s\") FROM \"%s\""
-               (:name (table))
-               name
-               (:name (table))))
-      first
-      :count))
-
-(defmethod field-distinct-count :postgres
-  [{:keys [db table name] :as field}]
-  (-> ((:native-query @db)
-       (format "SELECT COUNT(DISTINCT \"%s\".\"%s\") FROM \"%s\""
-               (:name (table))
-               name
-               (:name (table))))
-      first
-      :count))
+(defmethod driver/field-distinct-count :postgres [field]
+  (generic/field-distinct-count field))