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Ran 07 Sep 2020 05:30AM UTC

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Committed 07 Sep 2020 05:28AM UTC coverage: 72.026% (-0.06%) from 72.083%

Job # POSTGRESQL_VERSION=9.6

Build Type

push

travis-ci-com

Committed by

dantownsend

Commit Message

removing response_handler from Alter query

Added a lot of complexity, and potential performance downsides, to migrations which add columns. The original intention was if a default is a callable, the callable would be executed to create a unique value for each existing row, after the new column was added. This is useful when say the new value was a random number, uuid, or such. The UUID use case is now covered using the `columns.defaults.uuid.UUID4` class. In situations where the callable always generates the same value, the existing approach was very wasteful. This might be revisited in the future, if there are edge cases which require this behaviour - and if so, syntax will be added to support 'unique callables' vs 'static callables'.

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