[GitHub] [druid] somu-imply commented on pull request #13892: Various changes and fixes to UNNEST.

["somu-imply (via GitHub)" <gi...@apache.org>]

somu-imply commented on PR #13892:
URL: https://github.com/apache/druid/pull/13892#issuecomment-1459002744

   I think the reason is that there is an additional level of LogicalProject between Correlate and LogicalFilter in the query where `SELECT d3 FROM (select * from druid.numfoo where dim2='a'), UNNEST(MV_TO_ARRAY(dim3)) as unnested (d3)` it plans to 
   ```
   136:LogicalProject(d3=[$17])
     134:LogicalCorrelate(subset=[rel#135:Subset#7.NONE.[]], correlation=[$cor0], joinType=[inner], requiredColumns=[{3}])
       125:LogicalProject(subset=[rel#126:Subset#2.NONE.[]], __time=[$0], dim1=[$1], dim2=[CAST('a':VARCHAR):VARCHAR], dim3=[$3], dim4=[$4], dim5=[$5], dim6=[$6], d1=[$7], d2=[$8], f1=[$9], f2=[$10], l1=[$11], l2=[$12], cnt=[$13], m1=[$14], m2=[$15], unique_dim1=[$16])
         123:LogicalFilter(subset=[rel#124:Subset#1.NONE.[]], condition=[=($2, 'a')])
           9:LogicalTableScan(subset=[rel#122:Subset#0.NONE.[]], table=[[druid, numfoo]])
       130:Uncollect(subset=[rel#131:Subset#5.NONE.[]])
         128:LogicalProject(subset=[rel#129:Subset#4.NONE.[]], EXPR$0=[MV_TO_ARRAY($cor0.dim3)])
           12:LogicalValues(subset=[rel#127:Subset#3.NONE.[0]], tuples=[[{ 0 }]])
   ```
   
   which does not match the CorrelateFilterTranspose rule (L or R). We might need to address that but can be done with a later PR as well


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