eddelbuettel commented on issue #67:
URL: https://github.com/apache/arrow-nanoarrow/issues/67#issuecomment-1337497650
Thanks so much:
```r
> rl <- rcppnanoarrow::createArray()
> rl
$schema
<pointer: 0x55aa74b08ee0>
attr(,"class")
[1] "arch_schema"
$array_data
<pointer: 0x55aa76febc90>
attr(,"class")
[1] "arch_array_data"
attr(,"class")
[1] "arch_array"
> tibble::as_tibble(arch::from_arch_array(rl, arrow::RecordBatch))
# A tibble: 3 × 2
intCol dblCol
<int> <dbl>
1 21 21.1
2 42 42.2
3 63 63.3
>
```
'Repaired' code below.
<details>
```c++
//' @export
// [[Rcpp::export]]
Rcpp::List createArray() {
const int ncol = 2;
const int nrow = 3;
auto schemaxp = Rcpp::XPtr<struct ArrowSchema>(new struct ArrowSchema);
schemaxp.attr("class") = "arch_schema";
auto schema = schemaxp.get();
ArrowSchemaInit(schema, NANOARROW_TYPE_STRUCT);
ArrowSchemaAllocateChildren(schema, ncol);
auto arrayxp = Rcpp::XPtr<struct ArrowArray>(new struct ArrowArray);
arrayxp.attr("class") = "arch_array_data";
auto array = arrayxp.get();
ArrowArrayInit(array, NANOARROW_TYPE_STRUCT);
ArrowArrayAllocateChildren(array, ncol);
array->length = nrow;
array->null_count = -1;
// ...fill in schema.children and array.children
ArrowSchemaInit(schema->children[0], NANOARROW_TYPE_INT32);
ArrowSchemaSetName(schema->children[0], "intCol");
ArrowArrayInit(array->children[0], NANOARROW_TYPE_INT32);
ArrowArrayStartAppending(array->children[0]);
ArrowArrayAppendInt(array->children[0], 21);
ArrowArrayAppendInt(array->children[0], 42);
ArrowArrayAppendInt(array->children[0], 63);
ArrowArrayFinishBuilding(array->children[0], nullptr);
ArrowSchemaInit(schema->children[1], NANOARROW_TYPE_DOUBLE);
ArrowSchemaSetName(schema->children[1], "dblCol");
ArrowArrayInit(array->children[1], NANOARROW_TYPE_DOUBLE);
ArrowArrayStartAppending(array->children[1]);
ArrowArrayAppendDouble(array->children[1], 21.1);
ArrowArrayAppendDouble(array->children[1], 42.2);
ArrowArrayAppendDouble(array->children[1], 63.3);
ArrowArrayFinishBuilding(array->children[1], nullptr);
Rcpp::List as = Rcpp::List::create(Rcpp::Named("schema") = schemaxp,
Rcpp::Named("array_data") = arrayxp);
//as.attr("class") = "nanoarrow_array";
as.attr("class") = "arch_array";
return as;
}
```
</details>
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