Github user dilipbiswal commented on the pull request:
https://github.com/apache/spark/pull/9844#issuecomment-158869241
Thanks a lot @cloud-fan. Actually i do remember trying to do something
similar. So i had tried to filter on resolved and was trying to only pick
un-resolved attributes. But after i had done the execute i had difficulty to
stich together the two resolved attributes to restore the original sortorder.
We need to keep the orginal order of the attribute, right ? So here is what i
was trying ..
1) filter the sortorder attributes to only keep the unresolved ones.
2) copy them to aggregate expression and call execute
3) After this i wanted to form a sort order having both the already
filtered attributes and the newly resolved ones. This is where i was having
difficulty.
3) We then call checkAnalysis .. and rest of the logic follows.
I am sure you will have some magic here :-) Can you share your thoughts..
Thanks a lot.
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