New MV Implementation - Backfill and Empty Table Creation Support #558
Description
Goal
Provide mechanisms for initializing empty tables and handling backfill logic.
Description
- Add config options for controlling initial table state:
config(backfill='none' | 'manual' | 'auto')
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Support creating empty target tables before MVs are populated.
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Ensure backfilling does not block or break the MV linkage.