Join two Datasets (Galaxy Version 2.1.1) -- incorrectly inherits 1st input's datatype

[jennaj]

Problem: This tool used to always produce tabular/interval output (depending on the inputs) in some earlier version no longer available on the usegalaxy.org server.

Version 2.1.0 was incorrectly assigning the datatype data to outputs and that was addressed to produce version 2.1.1.

As of version 2.1.1, the tool inherits the datatype of the first input. If that datatype is not tabular or interval, an incorrect datatype assignment can be made. This causes downstream tools errors and breaks the 101 Tutorial.

First reported as part of this ticket: galaxyproject/usegalaxy-playbook#46

Test history: https://usegalaxy.org/u/jen/h/copy-of-courseegexons-and-repeats

Tests from 18.01:

Input dataset 1 bed first + 4 tabular second (following the 101 protocol). Result dataset 9 from tool version 2.1.1 is assigned bed but is really in interval (or tabular). Out of spec for bed.

Dataset 8 uses same inputs, but tool version 2.1.0, and is an example of the prior incorrect assignment of data for the datatype.

Rerun using 18.05: Shows that the datatype is coming from the 1st input.

• dataset 19, same result, bed (out of spec)

• flip the inputs, dataset 26 tabular now (ok, but interval would be better)

[jennaj]

Still a bug at ORG under pre-release 18.09 -- tool creates an out-of-spec bed result (inherits 1st input's datatype). Same test history was used.

[jennaj]

Works under dev repos in a local. Can track update to Main 19.01 in the playbook ticket and test once pre-release is installed: galaxyproject/usegalaxy-playbook#46