drin commented on pull request #9810:
URL: https://github.com/apache/arrow/pull/9810#issuecomment-810607005
@lidavidm I'm curious on your thoughts about other things that
`ScannerBuilder`s can be constructed from and whether this is something we
would want to add to these commits, or if we should have a separate commit?
As an example, one of the things that was difficult to figure out for our
research group from existing documentation was how to apply a scan to something
already in memory:
```cpp
using InMemDatasetPtr = std::shared_ptr<arrow::dataset::InMemoryDataset>;
using ScanBuilderPtr = std::shared_ptr<arrow::dataset::ScannerBuilder>;
...
// Create an in-memory dataset from the parsed record batch
InMemDatasetPtr batch_as_dataset =
std::make_shared<arrow::dataset::InMemoryDataset>(
table_batch->schema()
,RecordBatchVec({ table_batch })
);
// Create a scanner to pass the expression
ARROW_ASSIGN_OR_RAISE(
ScanBuilderPtr scanbuilder
,batch_as_dataset->NewScan()
);
...
```
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