Tom Lane
879808e519
Avoid promising that "ADD COLUMN ... DEFAULT NULL" is free.
...
The system realizes that DEFAULT NULL is dummy in simple cases, but not if
a cast function (such as a length coercion) needs to be applied. It's
dubious that suppressing that function call would be appropriate, anyway.
For the moment, let's just adjust the docs to say that you should omit the
DEFAULT clause if you don't want a rewrite to happen. Per gripe from Amit
Langote.
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