dharanad commented on issue #11436:
URL: https://github.com/apache/datafusion/issues/11436#issuecomment-2273952089
Sharing my observation from `DuckDB`, both `Map` exprssion and `map`
function are meant to do two different things.
But in Datafusion we are using `map` function to support `Map` expression.
In case of `DuckDB` `Map` expr & `map` function would yeild different result
for same input.
Shouldn't we have two different function to support these two use cases ? Or
any ideas on how should we support both usecases using using single `map`
function.
### Observations
```
D create table t as values
· ('a', 1, 'k1', 10, ['k1', 'k2'], [1, 2], 'POST', [[1,2,3]]),
· ('b', 2, 'k3', 30, ['k3'], [3], 'PUT', [[4]]),
‣ ('d', 4, 'k5', 50, ['k5'], [5], null, [[1,2]]);
D select map(col4, col5) from t;
┌───────────────────────┐
│ map(col4, col5) │
│ map(varchar, integer) │
├───────────────────────┤
│ {k1=1, k2=2} │
│ {k3=3} │
│ {k5=5} │
└───────────────────────┘
D select Map {col4: col5} from t;
┌────────────────────────────────────────────────────────┐
│ main.map(main.list_value(col4), main.list_value(col5)) │
│ map(varchar[], integer[]) │
├────────────────────────────────────────────────────────┤
│ {[k1, k2]=[1, 2]} │
│ {[k3]=[3]} │
│ {[k5]=[5]} │
└────────────────────────────────────────────────────────┘
```
In the meantime i will continue my investigation.
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