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Add multi_index::update_index for use upon addition of a new secondary index to an existing table. #1210
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…y index to an existing table.
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Change Description
This allows contract developers to add new indexes to existing tables without completely breaking them. Doing so requires a migration step before the new index can be used. Existing indexes can be used without issues before the migration is completed.
Upstreaming this as requested by @heifner
API Changes
Documentation Additions