Deprecate LIVE VIEW

[alexey-milovidov]

Changelog category (leave one):

• Documentation (changelog entry is not required)

[robot-ch-test-poll3]

This is an automated comment for commit 0d1bdff with description of existing statuses. It's updated for the latest CI running

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Style Check	Runs a set of checks to keep the code style clean. If some of tests failed, see the related log from the report	✅ success

[azat]

I would say that changelog entry is useful for this change (even though the code is still there), maybe this will force creators to fix all the bugs in LIVE VIEW to make it upstream ready

P.S. I'm using them to monitor changes to system tables with statistics

[vzakaznikov]

I might be mistaken, but the last time I've reviewed issues related to Live Views I did not spot anything specific to Live View code.
Live Views are using internal pipeline code so when some type of query is not working the fix has to go into the query pipeline.

[vzakaznikov]

As far as the support for this feature in general. Here is a related comment #39638 (comment).