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general
* Store subtables in chunks of 100 subtables per blob. Those 100 subtables are stored
serialized as an array: array($subtableID => subtableBlob). The first 100 subtables are
stored in "chunk_0", the next 100 subtables are stored in "chunk_1", ...
* Subtable Ids are now consecutive from 1 to X
* We do no longer serialize the whole Row instance when archiving, instead we only
serialize the Row's array which contains columns, metadata and datatable. This is not
only more efficient but allows us to refactor the Row instance in the future (although
we will always have to be BC)
* Faster row implementation: Columns, Metadata and Subtables access is much faster now
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