ovr commented on code in PR #2196:
URL: https://github.com/apache/arrow-datafusion/pull/2196#discussion_r861339475
##########
datafusion/physical-expr/src/expressions/get_indexed_field.rs:
##########
@@ -105,9 +105,51 @@ impl PhysicalExpr for GetIndexedFieldExpr {
}
(dt, key) => Err(DataFusionError::NotImplemented(format!("get
indexed field is only possible on lists with int64 indexes. Tried {} with {}
index", dt, key))),
},
- ColumnarValue::Scalar(_) => Err(DataFusionError::NotImplemented(
- "field access is not yet implemented for scalar
values".to_string(),
- )),
+ ColumnarValue::Scalar(scalar) => match (scalar.get_datatype(),
&self.key) {
+ (DataType::List(v), ScalarValue::Int64(Some(i))) => {
+ let wrapper = scalar.to_array();
Review Comment:
`to_array` uses `to_array_of_size` under the hood, but I cannot reuse the
code above, because it returns an `ColumnarValue::Array`, but in the case with
`ColumnarValue::Scalar` we need to return `ColumnarValue::Scalar`.
I did another draft in
https://github.com/apache/arrow-datafusion/pull/2196/commits/af8c77fcb947137a3d173ead288a2d7067c1be7d
WDYT?
Thanks
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