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馃挕 [REQUEST] - Warn users when fraction of merged reads is low#135

Description

@marchoeppner

Is your feature request related to a problem?

Certain amplicons may be larger than the combined read length, resulting in a situation where merging fails for all or some of the reads.

Describe the solution you'd like

We already have the option to deal with non-overlapping reads (--non_overlapping). What we lack is a way to alert users that they should use this option.

A minimal solution would include:

  • Count the merged reads
  • count the un-merged reads
  • Define a threshold past which we trigger an allert (> 10% unmerged?)

There is no built-in way to do this at the moment, and we have two completely separate processing chains to consider (dada2 + vsearch), which will require separate solutions.

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