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Previously, "COPY table TO" command worked only with plain tables and did not support materialized views, even when they were populated and had physical storage. To copy rows from materialized views, "COPY (query) TO" command had to be used, instead. This commit extends "COPY table TO" to support populated materialized views directly, improving usability and performance, as "COPY table TO" is generally faster than "COPY (query) TO". Note that copying from unpopulated materialized views will still result in an error. Author: jian he <jian.universality@gmail.com> Reviewed-by: Kirill Reshke <reshkekirill@gmail.com> Reviewed-by: David G. Johnston <david.g.johnston@gmail.com> Reviewed-by: Vignesh C <vignesh21@gmail.com> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/CACJufxHVxnyRYy67hiPePNCPwVBMzhTQ6FaL9_Te5On9udG=yg@mail.gmail.com