Re: Add RESPECT/IGNORE NULLS and FROM FIRST/LAST options

> Hi,
> Patch applies and compiles, all included tests passed and after the latest
> fixes for non-nulls array, performance is near to lead/lag without support
> of "ignore nulls".
> I have been using the last version for more than one month in a production
> environment with real data and didn't find any bugs, so It is ready for
> committer status.

One thing I worry about the patch is, now the non-nulls array
optimization was removed.  Since then I have been thinking about if
there could be other way to optimize searching for non null rows.

Best reagards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp