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36f048d6b0
Before only the timelines which have passed the `gc_horizon` were processed which failed with orphans at the tree_sort phase. Example input in added `test_branched_empty_timeline_size` test case. The PR changes iteration to happen through all timelines, and in addition to that, any learned branch points will be calculated as they would had been in the original implementation if the ancestor branch had been over the `gc_horizon`. This also changes how tenants where all timelines are below `gc_horizon` are handled. Previously tenant_size 0 was returned, but now they will have approximately `initdb_lsn` worth of tenant_size. The PR also adds several new tenant size tests that describe various corner cases of branching structure and `gc_horizon` setting. They are currently disabled to not consume time during CI. Co-authored-by: Joonas Koivunen <joonas@neon.tech> Co-authored-by: Anastasia Lubennikova <anastasia@neon.tech>