The event.mediawiki_user_blocks_change table in the Data Lake does not log partial block parameters. This means that it's impossible to determine if a block is sitewide or partial, and if it's the latter what pages/namespaces and such were blocked.
Here's an example from Italian Wikipedia:
In the logging table in MediaWiki:
| 51086528 | block | block | 20190622231903 | 2 | Marco1233333 | 44 | a:4:{s:11:"5::duration";s:7:"8 hours";s:8:"6::flags";s:8:"nocreate";s:8:"sitewide";b:0;s:15:"7::restrictions";a:1:{s:10:"namespaces";a:1:{i:0;s:1:"0";}}} | 0 | 474 | 0 |In event.mediawiki_user_blocks_change, this event is logged as follows:
blocks comment database meta performer user_groups user_text prior_stateuser_id _schema datacenter year month day hour
{"account_create":true,"email":false,"expiry_dt":"2019-06-23T07:19:03Z","name":false,"user_talk":false} Ripetuto inserimento di contenuto senza senso itwiki {"domain":"it.wikipedia.org","dt":"2019-06-22T23:19:03Z","id":"1f7b5c06-9544-11e9-a4e1-b083fecf1287","request_id":"XQ63ZwpAMFYAAHxlPasAAABF","schema_uri":null,"topic":null,"uri":"https://it.wikipedia.org/wiki/Utente:Marco1233333","stream":"mediawiki.user-blocks-change"} {"user_edit_count":29461,"user_groups":["sysop","*","user","autoconfirmed"],"user_id":1217526,"user_is_bot":false,"user_registration_dt":"2015-05-21T21:55:43Z","user_text":"Dan Kenshi"} ["*","user"] Marco1233333 {"blocks":{"account_create":null,"email":null,"expiry_dt":null,"name":null,"user_talk":null}} 1814692 /mediawiki/user/blocks-change/1.0.0 eqiad 2019 6 22 23With partial blocks being available on all wikis, it would be meaningful to be able to use event.mediawiki_user_blocks_change as a data source for user block data (see for instance T252225#6125157).