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RFC0012: Add and subtract operations (schema evolution) #6

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arnau commented Jan 26, 2018


Currently, the Registers Data Model has no way to evolve the data structure
described in the schema and used in data items. This means a Register has to
be designed upfront with the right fields forever given it is an append-only
log. We need a way to be able to evolve the schema definition and a way to
reflect such evolution on existing and new data.

Changes proposed in this pull request

This RFC proposes a way to add and subtract fields to a Register, and defines the meaning of this operation.

Please ignore the file. They're my working notes and they'll be removed once this RFC goes out of wip.

rfc: Add and subtract operations (schema evolution)
Signed-off-by: Arnau Siches <>

@arnau arnau added rfc wip labels Jan 26, 2018

@arnau arnau requested a review from michaelabenyohai Jan 26, 2018


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arnau commented Jan 26, 2018

@michaelabenyohai this PR is here to let us carry on with the discussion around lenses.

arnau added some commits Jan 26, 2018

Add explicit glossary anchors
Signed-off-by: Arnau Siches <>
Reword add fields to adapt to the RFC split
Signed-off-by: Arnau Siches <>

@arnau arnau changed the title Add and subtract operations (schema evolution) RFC0012: Add and subtract operations (schema evolution) Aug 9, 2018

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