GitHub user keith-turner opened an issue:
https://github.com/apache/incubator-fluo/issues/759
Add scanner over multiple Spans
The original intent of #626 was to support fetching multiple Spans. This
was not done because the result may not fit into memory. At the time when #626
was worked on the Scanner API was in a bad state. After the scanner the
scanner API improvements in #639, it would be relatively easy to add multiple
spans to the API. Could support something like the following.
```java
Snapshot snap = ...
snap.scanner().over(span1, span2, span3).build();
Collection<Span> spans = ...
snap.scanner().over(spans).fetch(col1, col2).build()
```
Multiple spans may result in out of order key iteration.
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