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box: functional and multikey indexes
Tarantool functional and multikey indexes allows you to create an index based on user-specified function. In a nutshell, this capability allows you to have case insensitive searches or sorts, search on complex equations, and extend the SQL language efficiently by implementing your own functions and operators and then searching on them. Feature use hidden space _i_{index_name}_{space_name} containing tuples of structure [{extractor_format}{pk_format}] and redefines on_replace trigger for target space to fill this space. Index object metamethods are monkeypatched to make indirect lookups in ispace to retrieve required tuple primary key. Closes #1260
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