[GitHub] incubator-fluo issue #759: Add scanner over multiple Spans

[keith-turner <gi...@git.apache.org>]

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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