Pg, Netezza, and... Sybase?

Is there a link between Sybase and Postgres?

I ask because I came across a bug in Netezza, and Netezza has a
well-known Postgres lineage, but when web-searching the bug, the first
thing I found was a Sybase reference-


http://geekswithblogs.net/marocanu2001/archive/2011/08/11/nasty-bug-in-sybase-iq-analytical-function-last_value-over-partition.aspx

and indeed that is the exact bug I found in Netezza! "first_value"
works great, "last_value" has window size 1 unless you also say "rows
between unbounded preceding and unbounded following".

Two unrelated commercial products with the same bug makes me wonder...
does/did Postgres also have this issue, with both NZ and Sybase
importing the same buggy code?