Improve PartialECChangeUnifier to handle very large changeset #7607
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…attbjordan/disk-based-unifier-poc
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Fixes: #7553
This API is beta.
PartialECChangeUnifieruse in memory cache that resulted OOM error when processing very large changeset.Solution is to use SQLite TEMP db to unify changes across multiple tables
original POC done by @mattbjordan