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Instead of using slightly-too-clever heuristics to decide when we must create a TOAST table, just check whether one is needed every time the table is altered. Checking whether a toast table is needed is cheap enough that we needn't worry about doing it on every ALTER TABLE command, and the previous coding is apparently prone to accidental breakage: commit 04e17bae50a73af524731fa11210d5c3f7d8e1f9 broken ALTER TABLE .. SET STORAGE, which moved some actions from AT_PASS_COL_ATTRS to AT_PASS_MISC, and commit 6c5723998594dffa5d47c3cf8c96ccf89c033aae broke ALTER TABLE .. ADD COLUMN by changing the way that adding columns recurses into child tables. Noah Misch, with one comment change by me
PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: http://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Changes between all PostgreSQL releases are recorded in the file HISTORY. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.