The Information Schema
INNODB_FT_BEING_DELETED table is only used while document ID's in the related INNODB_FT_DELETED are being removed from an InnoDB fulltext index while an OPTIMIZE TABLE is underway. At all other times the table will be empty.
It has the following column:
||Document ID of the row being deleted. Either an underlying ID value, or a sequence value generated by InnoDB if no usable option exists.|
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