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Previously the Operation enum consisted of: - Operation::Scan - Operation::Search - Operation::Subquery Which was always a dumb hack because what we really are doing is an Operation::Scan on a "virtual"/"pseudo" table (overloaded names...) derived from a subquery appearing in the FROM clause. Hence, refactor the relevant data structures so that the Table enum now contains a new variant: Table::FromClauseSubquery And the Operation enum only consists of Scan and Search. ``` SELECT * FROM (SELECT ...) sub; -- the subquery here was previously interpreted as Operation::Subquery on a Table::Pseudo, -- with a lot of special handling for Operation::Subquery in different code paths -- now it's an Operation::Scan on a Table::FromClauseSubquery ``` No functional changes (intended, at least!) Reviewed-by: Pere Diaz Bou <pere-altea@homail.com> Closes #1529