Add test for mixed param case

Author: andriygm

internal/endtoend/testdata/order_by_binds/sqlite/exec.json

@@ -3,6 +3,17 @@ SELECT  * FROM authors
 WHERE   id > sqlc.arg(min_id) 
 ORDER   BY CASE WHEN sqlc.arg(sort_column) = 'name' THEN name END;
 
+-- name: ListAuthorsColumnSortDirection :many
+SELECT * FROM authors
+WHERE id > ?
+ORDER BY
+    CASE
+        WHEN @order_by = 'asc' THEN name
+    END ASC,
+    CASE
+        WHEN @order_by = 'desc' OR @order_by IS NULL THEN name
+    END DESC;
+
 -- name: ListAuthorsColumnSortFnWtihArg :many
 SELECT  * FROM authors
 ORDER   BY id % ?;

internal/endtoend/testdata/order_by_binds/sqlite/go/db.go

@@ -4,7 +4,7 @@
     {
       "path": "go",
       "engine": "sqlite",
-      "name": "querytest",
+      "name": "order_by_binds",
       "schema": "schema.sql",
       "queries": "query.sql"
     }