test: autogen.py remove radom select

tests/pytest/util/autogen.py

@@ -51,7 +51,7 @@ class AutoGen:
         metas = []
         for i in range(cnt):
             colname = f"{pre}{i}"
-            sel = len(types) % len(types)
+            sel = i % len(types)
             coltype = types[sel]
             sql = f"{colname} {coltype}"
             if sqls != "":