Martijn van Oosterhout wrote:
There's also the performance angle. The current mbverify is very
inefficient for encodings like UTF-8. You might need to refactor a bit

There appears to be a lot of function call overhead in the current implementation. In pg_verify_mbstr, the function pointer pg_wchar_table.mbverify is called for each multibyte character in a multibyte string.

Refactoring the way these table driven functions work would impact lots of other code. Just grep for all files #including mb/pg_wchar.h for the list of them. The list includes interfaces/libpq, and I'm wondering if software that links against postgres might rely on these function prototypes?


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