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This is an SQL-standard feature that allows creating columns that are computed from expressions rather than assigned, similar to a view or materialized view but on a column basis. This implements one kind of generated column: stored (computed on write). Another kind, virtual (computed on read), is planned for the future, and some room is left for it. Reviewed-by: Michael Paquier <michael@paquier.xyz> Reviewed-by: Pavel Stehule <pavel.stehule@gmail.com> Discussion: https://www.postgresql.org/message-id/flat/b151f851-4019-bdb1-699e-ebab07d2f40a@2ndquadrant.com
Guide to alternative expected files: plpython_error_0.out Python 2.4 and older plpython_error_5.out Python 3.5 and newer plpython_unicode.out server encoding != SQL_ASCII plpython_unicode_3.out server encoding == SQL_ASCII plpython_subtransaction_0.out Python 2.4 and older (without with statement) plpython_subtransaction_5.out Python 2.5 (without with statement) plpython_types_3.out Python 3.x