sadboy commented on issue #4628:
URL:
https://github.com/apache/arrow-datafusion/issues/4628#issuecomment-1864881743
To add a counter point to this change -- without sub-tree sharing, and in
the presence of CTEs, LogicalPlan trees would be exponential in the size of the
SQL query:
```
WITH
A as (select 1 x),
B as (select * from A, A)
C as (select * from B, B)
D as (select * from C, C)
select * from D;
```
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