[backport release-3_22][processing] save NULL and empty values into different files in Split Vector Layer algorithm (fix #38105) #47030
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alexbruy
added
Backport
nyalldawson
reviewed
Jan 28, 2022
nyalldawson
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Jan 28, 2022
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Description
Manual backport of the Split Vector Layer algorithm fix from #46997.
The Split Vector Layer algorithm exports both NULL and empty attribute values to the same filename, as a result one file overwrites another and some results are lost. Proposed PR assigns different suffixes for such files (_EMPTY and _NULL).
Fixes #38105.
Also fix unreported bug with displaying incorrect number of features written to each output file.