Michał Jadwiszczak a9b2baf36b db/schema_tables: don't emit empty view_building_tasks mutation on ALTER TABLE ...

After recent change (1a32ccd) `make_update_indices_mutations()` is unconditionally
adding a mutation for `system.view_building_tasks`, even when no indices were being dropped.

In a mixed-version cluster, the older node may not have this table,
causing the Raft schema applier to fail with 'Can't find a column
family with UUID ...'.

This patch fixes the bug by emitting the mutation when indices are actually
dropped (i.e., when the view building cleanup code path was entered).

Fixes: SCYLLADB-2026
Refs: scylladb#26557

2026-05-18 10:01:21 +02:00

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