Allow Last Run metadata to persist

[fharper]

This is similar to a prior idea now marked complete "Allow macro metadata to persist until next run".  I tried the check box solution and still have the same issue, running V11.

What we NEED is for tools that derive columns like CrossTab to retain metadata from the most recent run and thus pass that metadata downstream for further tools and development.

Use case:

I have several cross tabs and before V11 I could run the flow once to push metadata downstream, then add or modify tools downstream and the derived fields from the cross tab stayed available in those tools to be recognized and referenced as I add more tools and logic. Now in V11 I am finding if I click on a tool or add a tool downstream the metadata for the derived columns disappears.

I attached pics to illustrate where I have 6 CrossTabs and decided I needed to add a summary downstream.  I had to run the flow to get metadata populated which is normal and I added the first summary, then inserted another summary and immediately the derived column metadata was lost in all paths after the crosstabs.  so ended up having to re-run the flow 5 more times for each summary tool added. then I had to re-run it 5 more times to adjust column names in selects after downstream joins.

I end up wasting a lot of time having to re-run a sufficient test file to feed all the variety of data necessary to generate all columns between most edits or new tool adds.  What used to take ~5 minutes to do now takes ~35

I recall seeing and discussing this issue previously and hoped the check box would resolve but It does not fix the issue.  

We see similar issue for tools downstream from other tools where the columns are derived or uncertain until that tool runs, such as, transpose, Joins and Unions.  I recall some discussion at user groups and in the community but the only reference I found this morning of seeming relevance is the one I mentioned above.

[KylieF]

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