branch-3.1: [feature](nereids) Support dereference expression #57532 #58550
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Support dereference expression for map/struct/variant
```sql
MySQL root@127.0.0.1:rqg> select
-> named_struct('c', named_struct('c', 100)).c.c,
-> map('a', 10, 'b', 20).a,
-> map('a', 10, 'b', 20).b,
-> cast('{"a":{"b":300}}' as variant).a.b;
+-----------------------------------------------+-------------------------+-------------------------+----------------------------------------+
| named_struct('c', named_struct('c', 100)).c.c | map('a', 10, 'b', 20).a | map('a', 10, 'b', 20).b | cast('{"a":{"b":300}}' as variant).a.b |
+-----------------------------------------------+-------------------------+-------------------------+----------------------------------------+
| 100 | 10 | 20 | 300 |
+-----------------------------------------------+-------------------------+-------------------------+----------------------------------------+
```
<b>the slot name parts binding priority:</b>
1. try to bind catalog, if binding failed, jump to 2
2. try to bind database, if binding failed, jump to 3
3. try to bind table, if binding failed, jump to 4
4. try to bind column
for example, `a.a.a.a.a`
first try to bind: catalog=a, database=a, table=a, column=a, sub
fields=a
second try to bind: catalog=<current catalog>, database=a,
table=a, column=a, sub fields=a.a
third try to bind: catalog=<current catalog>, database=<current
database>, table=a, column=a, sub fields=a.a.a
4th try to bind: catalog=<current catalog>, database=<current
database>, table=<underscore table>, column=a, sub
fields=a.a.a.a
(cherry picked from commit ac92fd4)
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morrySnow
approved these changes
Dec 1, 2025
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picked from #57532