vibhatha opened a new issue, #14965: URL: https://github.com/apache/arrow/issues/14965
### Describe the enhancement requested
At the moment, Acero-Substrait integration doesn't support projection in the
`ReadRel`. To enable this of the main contibutions is to consume
`MaskExpressions` in Acero. A sample Substrait plan is shown below. At the
moment this plan cannot be consumed using Acero.
```json
{
"extensions": [
{
"extensionFunction": {
"functionAnchor": 1,
"name": "equal"
}
}
],
"relations": [
{
"root": {
"input": {
"project": {
"input": {
"project": {
"input": {
"join": {
"left": {
"read": {
"baseSchema": {
"names": [
"o_orderkey",
"o_custkey",
"o_orderstatus",
"o_totalprice",
"o_orderdate",
"o_orderpriority",
"o_clerk",
"o_shippriority",
"o_comment"
],
"struct": {
"types": [
{
"i32": {
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"i32": {
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 1,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"decimal": {
"scale":
2,
"precision": 15,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"date": {
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 15,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 15,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"i32": {
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 78,
"nullability": "NULLABILITY_NULLABLE"
}
}
],
"nullability":
"NULLABILITY_REQUIRED"
}
},
"projection": {
"select": {
"structItems": [
{
"field": 1
}
]
},
"maintainSingularStruct": true
},
"namedTable": {
"names": [
"orders"
]
}
}
},
"right": {
"read": {
"baseSchema": {
"names": [
"c_custkey",
"c_name",
"c_address",
"c_nationkey",
"c_phone",
"c_acctbal",
"c_mktsegment",
"c_comment"
],
"struct": {
"types": [
{
"i32": {
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 18,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 40,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"i32": {
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 15,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"decimal": {
"scale":
2,
"precision": 15,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 10,
"nullability": "NULLABILITY_NULLABLE"
}
},
{
"varchar": {
"length": 116,
"nullability": "NULLABILITY_NULLABLE"
}
}
],
"nullability":
"NULLABILITY_REQUIRED"
}
},
"projection": {
"select": {
"structItems": [
{}
]
},
"maintainSingularStruct": true
},
"namedTable": {
"names": [
"customer"
]
}
}
},
"expression": {
"scalarFunction": {
"functionReference": 1,
"outputType": {
"bool": {
"nullability":
"NULLABILITY_NULLABLE"
}
},
"arguments": [
{
"value": {
"selection": {
"directReference": {
"structField": {}
},
"rootReference": {}
}
}
},
{
"value": {
"selection": {
"directReference": {
"structField": {
"field": 1
}
},
"rootReference": {}
}
}
}
]
}
},
"type": "JOIN_TYPE_INNER"
}
},
"expressions": [
{
"selection": {
"directReference": {
"structField": {}
},
"rootReference": {}
}
},
{
"selection": {
"directReference": {
"structField": {
"field": 1
}
},
"rootReference": {}
}
}
]
}
},
"expressions": [
{
"selection": {
"directReference": {
"structField": {}
},
"rootReference": {}
}
}
]
}
},
"names": [
"o_custkey"
]
}
}
]
}
```
### Component(s)
C++
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