ion-elgreco commented on issue #15351: URL: https://github.com/apache/datafusion/issues/15351#issuecomment-2746134153
@goldmedal this is is the initial projection:
```rust
crates/core/src/operations/merge/mod.rs:1270:5] &new_columns = [
(
"__delta_rs_c_foo",
Case(
Case {
expr: Some(
Column(
Column {
relation: None,
name: "__delta_rs_operation",
},
),
),
when_then_expr: [
(
Literal(
Int32(0),
),
Column(
Column {
relation: Some(
Bare {
table: "s",
},
),
name: "foo",
},
),
),
(
Literal(
Int32(1),
),
Column(
Column {
relation: Some(
Bare {
table: "s",
},
),
name: "foo",
},
),
),
(
Literal(
Int32(2),
),
Column(
Column {
relation: Some(
Bare {
table: "t",
},
),
name: "foo",
},
),
),
(
Literal(
Int32(3),
),
Column(
Column {
relation: Some(
Bare {
table: "t",
},
),
name: "foo",
},
),
),
(
Literal(
Int32(4),
),
Column(
Column {
relation: Some(
Bare {
table: "t",
},
),
name: "foo",
},
),
),
],
else_expr: None,
},
),
),
(
"__delta_rs_c_bar",
Case(
Case {
expr: Some(
Column(
Column {
relation: None,
name: "__delta_rs_operation",
},
),
),
when_then_expr: [
(
Literal(
Int32(0),
),
Column(
Column {
relation: Some(
Bare {
table: "s",
},
),
name: "bar",
},
),
),
(
Literal(
Int32(1),
),
Column(
Column {
relation: Some(
Bare {
table: "s",
},
),
name: "bar",
},
),
),
(
Literal(
Int32(2),
),
Column(
Column {
relation: Some(
Bare {
table: "t",
},
),
name: "bar",
},
),
),
(
Literal(
Int32(3),
),
Column(
Column {
relation: Some(
Bare {
table: "t",
},
),
name: "bar",
},
),
),
(
Literal(
Int32(4),
),
Column(
Column {
relation: Some(
Bare {
table: "t",
},
),
name: "bar",
},
),
),
],
else_expr: None,
},
),
),
```
this the final write_projection:
```rust
[crates/core/src/operations/merge/mod.rs:1306:5] &write_projection = [
Cast(
Cast {
expr: Alias(
Alias {
expr: Column(
Column {
relation: None,
name: "__delta_rs_c_foo",
},
),
relation: None,
name: "foo",
},
),
data_type: Int64,
},
),
Cast(
Cast {
expr: Alias(
Alias {
expr: Column(
Column {
relation: None,
name: "__delta_rs_c_bar",
},
),
relation: None,
name: "bar",
},
),
data_type: Map(
Field {
name: "key_value",
data_type: Struct(
[
Field {
name: "key",
data_type: Utf8,
nullable: false,
dict_id: 0,
dict_is_ordered: false,
metadata: {},
},
Field {
name: "value",
data_type: Float64,
nullable: true,
dict_id: 0,
dict_is_ordered: false,
metadata: {},
},
],
),
nullable: false,
dict_id: 0,
dict_is_ordered: false,
metadata: {},
},
false,
),
},
),
]
```
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