comphead commented on PR #9104:
URL:
https://github.com/apache/arrow-datafusion/pull/9104#issuecomment-1926038812
There is a bigger problem behind, even simple sql
```
let sql = "select a, a + 1 b from (select 1 a union all select 2 a)";
```
calls `Schema::new_with_metadata` 58 times and `Schema::merge` 35 times
I'll try to look into the problem from other side to avoid excessive schema
transform calls.
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