shahidki31 commented on pull request #32659:
URL: https://github.com/apache/spark/pull/32659#issuecomment-851056661
Hi @srowen ,
I checked the code and I ran all the TPCDS queries to find the potential
cases. Following are the observations.
1. Aggregate expressions like sum, avg, count etc. -> We can't estimate
stats for this.
2. Literal Expressions -> We can estimate stats. (q5 and q14b of TPCDS)
3. String repeat -> Opposite of substring. We can estimate the stats.
I have added support for 2 and 3. I am not sure we can find a supercase, as
each one's estimation will be different.
Please review. Thanks
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