alamb commented on issue #4346:
URL:
https://github.com/apache/arrow-datafusion/issues/4346#issuecomment-1325607236
If you are curious, here is an example of the before/after schema:
```
[2m2022-11-23T19:28:01.303927Z[0m [35mTRACE[0m
[2mdatafusion_optimizer::optimizer[0m[2m:[0m original schema: DFSchema {
fields: [
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "count",
data_type: UInt64,
nullable: true,
dict_id: 0,
dict_is_ordered: false,
metadata: None,
},
},
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "system",
data_type: Float64,
nullable: true,
dict_id: 0,
dict_is_ordered: false,
metadata: None,
},
},
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "time",
data_type: Timestamp(
Nanosecond,
None,
),
nullable: false,
dict_id: 0,
dict_is_ordered: false,
metadata: None,
},
},
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "town",
data_type: Dictionary(
Int32,
Utf8,
),
nullable: true,
dict_id: 0,
dict_is_ordered: false,
metadata: None,
},
},
],
metadata: {},
}
[2m2022-11-23T19:28:01.303963Z[0m [35mTRACE[0m
[2mdatafusion_optimizer::optimizer[0m[2m:[0m new plan schema: DFSchema {
fields: [
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "count",
data_type: UInt64,
nullable: true,
dict_id: 0,
dict_is_ordered: false,
metadata: Some(
{
"iox::column::type":
"iox::column_type::field::uinteger",
},
),
},
},
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "system",
data_type: Float64,
nullable: true,
dict_id: 0,
dict_is_ordered: false,
metadata: Some(
{
"iox::column::type":
"iox::column_type::field::float",
},
),
},
},
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "time",
data_type: Timestamp(
Nanosecond,
None,
),
nullable: false,
dict_id: 0,
dict_is_ordered: false,
metadata: Some(
{
"iox::column::type": "iox::column_type::timestamp",
},
),
},
},
DFField {
qualifier: Some(
"restaurant",
),
field: Field {
name: "town",
data_type: Dictionary(
Int32,
Utf8,
),
nullable: true,
dict_id: 0,
dict_is_ordered: false,
metadata: Some(
{
"iox::column::type": "iox::column_type::tag",
},
),
},
},
],
metadata: {},
}
```
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