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The field summary tool is an excellent resource to get an overview of the data and spot targets for analysis or data cleansing.
Unfortunately it has limitations either in the number of fields included or some combination of the number of fields and one or more of its attributes. There is nothing in the documentation I found to make a user aware of this. When you exceed N fields selected the system just hangs, indicating it is running but there is no connection progress shown and nothing seems to happen, even if you limit input to 1 record.
Through trial and error I found an approximate limit in number of fields I can include and still have it work.
I request that Alteryx update the tool help info and devise enhancements to dynamically load balance the tool so it can scale to the number of fields requested or at least warn when the limit is reached or approached. The latter warning could be similar to the red font warnings in the formula tool when you have a malformed expression. However a load balancing version is most desired.
The issue as it stands results in users wasting a lot of time trying to make the tool work as expected, then report it to support as an apparent bug in the tool which can be argued both ways.
I realize in the real world there are limits but in this real world we are seeing the number of fields to analyze increase significantly, especially when you have a data license and integrate 3rd party data to you own native data adding a hundred or hundreds more fields.