jayzhan211 commented on issue #12843:
URL: https://github.com/apache/datafusion/issues/12843#issuecomment-2406247191
```
D create table t(s1 struct(a int, b varchar), s2 struct(a float, b varchar));
D insert into t values (row(1, 'r'), row(2.2, 'b'));
D select [s1, s2] from t;
┌──────────────────────────────────────────┐
│ main.list_value(s1, s2) │
│ struct(a float, b varchar)[] │
├──────────────────────────────────────────┤
│ [{'a': 1.0, 'b': r}, {'a': 2.2, 'b': b}] │
└──────────────────────────────────────────┘
D select coalesce(s1, s2) from t;
┌────────────────────────────┐
│ COALESCE(s1, s2) │
│ struct(a float, b varchar) │
├────────────────────────────┤
│ {'a': 1.0, 'b': r} │
└────────────────────────────┘
D select typeof(s1) from t;
┌──────────────────────────────┐
│ typeof(s1) │
│ varchar │
├──────────────────────────────┤
│ STRUCT(a INTEGER, b VARCHAR) │
└──────────────────────────────┘
```
Coercion rule is so inconsistent, array and coalesce converts int to float,
but values doesn't
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