Hi, I've pushed the first part of the patch, adding ScalarArrayOpExpr as supported clause for functional dependencies, and then also doing the same for MCV lists.
As discussed, I'm not going to do anything about the array containment clauses for PG13, that needs more discussion. I have a bunch of additional improvements for extended stats, discussed in [1]. I'll wait a bit for buildfarm and maybe some feedback before pushing those. [1] https://www.postgresql.org/message-id/flat/20200113230008.g67iyk4cs3xbnjju@development regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
