goldmedal commented on issue #10688:
URL: https://github.com/apache/datafusion/issues/10688#issuecomment-2137807135
I wanted to share something I found. I tried to observe the plan
transformation step by step:
sql_to_plan -> analyze -> optimize
```
SQL: select 128.2 union all select 128.2::float
********
Original LogicalPlan:
Union
Projection: Float64(128.2) AS Float64(128.2)
EmptyRelation
Projection: CAST(CAST(Float64(128.2) AS Float32) AS Float64) AS
Float64(128.2)
EmptyRelation
********
Do some analyze:
Union
Projection: Float64(128.2) AS Float64(128.2)
EmptyRelation
Projection: CAST(CAST(Float64(128.2) AS Float32) AS Float64) AS
Float64(128.2)
EmptyRelation
********
Do some optimize:
Union
Projection: Float64(128.2) AS Float64(128.2)
EmptyRelation
Projection: Float64(128.1999969482422) AS Float64(128.2)
EmptyRelation
********
```
I found that `CAST` is removed after the plan is optimized. I'm not sure
which optimization rule does this—maybe `unwrap_cast_in_comparison.rs`? I'm not
sure. I'll keep tracking it tomorrow.
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