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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