Enhancement
There're too many oracle related code in errno files.
The related files may include (src/share):

• gen_errno.pl. generating cpp files depends on ob_errno.def
• ob_errno.def. defining error code.
• ob_errno.h, ob_errno.cpp. Generated by gen_errno.pl

We can delete oracle related code in gen_errno.pl and then ob_errno.def.
Please feel free to create more issues if you need.