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Rearchitect the colgroup processing to be more granular using multiple sorts as opposed to a single sort or more intelligently avoid the colgroup sort altogether (when possible)
Looking at the job output you sent in, we can see that there are 18 colgroups specified.
Based on the current design, we have a single sort for colgroup(s).
There are 184310123 rows unloaded
The no. of the rows passed to the single
dstats sort ...
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