Add new index on datasource and task_allocator_id for pending segments #16355
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Adds a new index on (datasource, task_allocator_id) for the druid_pendingSegments table to optimize fetching of pending segments by task_allocator_id for cleanup and transaction append / replace actions.
The index is added on columns that are (mostly) null, and is not expected to hinder the startup of the Overlord.
I have locally tested this out on a pending segments table with > 2M rows and this operation took 2.14s.
This PR has: