lewiszlw commented on issue #11707:
URL: https://github.com/apache/datafusion/issues/11707#issuecomment-2264772430
For example `select count(1) as count from t`, the generated name is
`count(1)`, we need be able to store alias.
`AggregateExec`'s `aggr_expr` field doesn't support alias, so we have to set
alias as the name of aggr expr.
```
pub struct AggregateExec {
/// Aggregate expressions
aggr_expr: Vec<Arc<dyn AggregateExpr>>,
...
}
pub struct ProjectionExec {
/// The projection expressions stored as tuples of (expression, output
column name)
pub(crate) expr: Vec<(Arc<dyn PhysicalExpr>, String)>,
...
}
```
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