barplots: TSV/CSV download should contain relative abundances

[nbokulich]

Improvement Description
This would be consistent with what is shown in the barplots and is more useful than absolute counts (e.g., if a user wants to download and generate the same plots outside of QIIME 2).

References
Raised in this forum post

[ebolyen]

I think this also fits in with the idea of downloading the current view-state as a CSV (I don't think there's an existing issue for that either).

[jairideout]

👍, I think we should support both absolute and relative frequencies

[thermokarst]

This recently came up on the forum.

[qins]

This feature is useful. Is there a time table?

[thermokarst]

@qins - no, this is pretty low on our priority list since the relative abundance can be calculated directly from the absolute abundance values. If you need help with this calculation please open a new topic at https://forum.qiime2.org. Thanks!

[qins]

I calculated the relative abundance with a script. But many users may want a to-end solution.
Thank you for the reply, and the excellent work :-)

[KatherineXUE]

Why the CSV file downloaded from taxa-bar-plot shows fewer entities than the real sequences? In this case, this table is only part of the feature table. How can we get a complete absolute abundance and a relative abundance (with taxonomy) table?

[nbokulich]

Hi @KatherineXUE please get in touch on the QIIME 2 forum for support questions. Thanks!