SNOW-1501890 Implement structured maps (#1171)

Author: sfc-gh-pfus

bind_uploader.go

@@ -256,9 +256,9 @@ func getBindValues(bindings []driver.NamedValue, params map[string]*string) (map
 			}
 			if t == nullType || t == unSupportedType {
 				t = textType // if null or not supported, pass to GS as text
-			} else if t == nilObjectType {
+			} else if t == nilObjectType || t == mapType || t == nilMapType {
 				t = objectType
-			} else if t == emptyArrayType || t == nilArrayType {
+			} else if t == nilArrayType {
 				t = arrayType
 			}
 			bindValues[bindingName(binding, idx)] = execBindParameter{
@@ -355,3 +355,8 @@ func supportedStructuredArrayBind(nv *driver.NamedValue) bool {
 	typ := reflect.TypeOf(nv.Value)
 	return typ != nil && (typ.Kind() == reflect.Array || typ.Kind() == reflect.Slice)
 }
+
+func supportedStructuredMapBind(nv *driver.NamedValue) bool {
+	typ := reflect.TypeOf(nv.Value)
+	return typ != nil && (typ.Kind() == reflect.Map || typ == reflect.TypeOf(NilMapTypes{}))
+}

connection.go

@@ -470,7 +470,7 @@ func (sc *snowflakeConn) Ping(ctx context.Context) error {
 // CheckNamedValue determines which types are handled by this driver aside from
 // the instances captured by driver.Value
 func (sc *snowflakeConn) CheckNamedValue(nv *driver.NamedValue) error {
-	if supportedNullBind(nv) || supportedArrayBind(nv) || supportedStructuredObjectWriterBind(nv) || supportedStructuredArrayBind(nv) {
+	if supportedNullBind(nv) || supportedArrayBind(nv) || supportedStructuredObjectWriterBind(nv) || supportedStructuredArrayBind(nv) || supportedStructuredMapBind(nv) {
 		return nil
 	}
 	return driver.ErrSkip