Drupal 8 Field Type Schema column add / change / delete HOOK_update

As heavily discucced in this years old issue: [#937442] there isn't a good solution or helper in Drupal core currently to change the schema of a custom field.

Modules like

  • field_collection
  • dynamic_entity_reference (#51)
  • address
  • viewsreference
  • ...

are having the same problem and wrote their own hook_update implementations as workaround.

Until the issue is solved I wrote two first helper functions to use in a modules .install file to change the field type schema columns:
https://gist.github.com/JPustkuchen/ce53d40303a51ca5f17ce7f48c363b9b

Please feel free to fork or extend my implementations.

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