Re: Keep notnullattrs in RelOptInfo (Was part of UniqueKey patch series)

Hi:

This patch is the first patch in UniqueKey patch series[1], since I need to revise 

that series many times but the first one would be not that often, so I'd like to
submit this one for review first so that I don't need to maintain it again and again.

v1-0001-Introduce-notnullattrs-field-in-RelOptInfo-to-ind.patch

Introduce notnullattrs field in RelOptInfo to indicate which attr are not null
in current query. The not null is judged by checking pg_attribute and query's
restrictinfo. The info is only maintained at Base RelOptInfo and Partition's
RelOptInfo level so far.


Any thoughts?

[1] https://www.postgresql.org/message-id/CAKU4AWr1BmbQB4F7j22G%2BNS4dNuem6dKaUf%2B1BK8me61uBgqqg%40mail.gmail.com 

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Best Regards

Andy Fan (https://www.aliyun.com/)