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Parents and children of check-in [3d0e00c7]

Additional test cases involving the use of a result column specified by its "AS" name as a logical term of the WHERE clause. Ticket [a7b7803e8d1e8699cd]. check-in: d7cc364e user: drh tags: tkt-a7b7803e
Proposed fix for ticket [a7b7803e8d1e8699cd8a]. check-in: 3d0e00c7 user: drh tags: tkt-a7b7803e
Optimize the degenerate case of a FROM clause table name enclosed all by itself inside parentheses. Generate code as if the parentheses did not exist, rather than the old behavior of manifesting the parenthesized table into a transient table. Also, tag every FROM-clause SELECT subquery that is generated by a parenthesized FROM-clause expression using the SF_NestedFrom flag. The new SF_NestedFrom flag is not yet used for anything. check-in: 7fecced4 user: drh tags: trunk