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When building match result patterns the tuples they must qouted
with { }, which causes a problem with variable patterns.
Use element(1, Match) instead of trying to build the two tuple.
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* dgud/mnesia/ext-backend/PR-858/OTP-13058:
mnesia_ext: Add basic backend extension tests
mnesia_ext: reuse snmp field for ext updates
mnesia_ext: Create table/data containers from mnesia monitor not temporary processes
mnesia_ext: Implement ext copies index
mnesia_ext: Load table ext
mnesia_ext: Dumper and schema changes
mnesia_ext: Refactor mnesia_schema.erl
mnesia_ext: Ext support in fragmented tables
mnesia_ext: Backup handling
mnesia_ext: Create schema functionality
mnesia_ext: Add ext copies and db_fold to low level api
mnesia_ext: Refactor record_validation code
mnesia_ext: Add create_external and increase protocol version to monitor
mnesia_ext: Add ext copies to records
mnesia_ext: Add supervisor and behaviour modules
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There is no need to update the index table if a record is updated in non
indexed field. This removes one timing glitch where dirty_index_read would
return an empty list for records that where updated.
There is still an issue with dirty_index_read when updates are made to
the index field, it have been reduced but the real table updates are made
after the index table references have been added.
Originally reported by Nick Marino in erl-questions mailing list, thanks.
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dirty_update_counter returned the wrong value when a subscriber existed
and no events was sent. Thanks Anton Ryabkov.
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table index
In case of bag tables, trying to delete a non-existing object leads to
the index becoming corrupt. This happens if the non-existing object we
try to delete happens to share its key and index field value with a single
existing object in the table.
Result: The index entry corresponding to the existing object is
removed.
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