On 2020-02-17 20:08, Daniel Verite wrote:
> Concerning execution speed, there's an excessive CPU usage when
> normalizing into NFC or NFKC. Looking at pre-existing code, it looks
> like recompose_code() in unicode_norm.c looping over the
> UnicodeDecompMain array might be very costly.
Yes, this is a known issue and I think room for future optimization work.
> Another point is that the ICU-based implementation appears
> to be significantly faster in all cases, which makes me wonder
> why ICU builds should not just use ICU instead of the PG-core
> implementation.
That would require linking libpq to ICU (for SASLprep), and in general
would either make ICU required or require maintaining multiple
implementations. I don't think we're there yet.
--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
