After you completed the pliability exercise and got an idea of ββthe mappings, I would look at mongoexport - you have to be careful but you will also have to import CSV / TSV into MySQL in a reasonable way.
Another option, especially if you are faced with input problems, is to simply pull out all your data programmatically using your language and the selected driver and paste it directly into MySQL again using your favorite driver - this gives you maximum control, but also and the biggest job.
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