Fix GIN opclass handling for array columns

pkg/writers/pgsql/writer.go

@@ -1251,6 +1251,9 @@ func isIntegerType(colType string) bool {
 func isTextType(colType string) bool {
 	textTypes := []string{"text", "varchar", "character varying", "char", "character", "string"}
 	lowerType := strings.ToLower(colType)
+	if strings.HasSuffix(lowerType, "[]") {
+		return false
+	}
 	for _, t := range textTypes {
 		if strings.HasPrefix(lowerType, t) {
 			return true