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Function to scan an HBase table and return a data frame. #7

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@l0s l0s commented May 22, 2014

The row names of the resulting data frame are the keys of the HBase table. The column names are those specified in colspec. If a row does not have a value for a column specified in colspec, then that cell will
be populated with NA.

Discussion here: https://groups.google.com/d/msg/rhadoop/Oty-A0UodTM/ngbLVAFRX0oJ

l0s added 4 commits May 21, 2014 20:58
The row names of the resulting data frame are the keys of the HBase
table. The column names are those specified in colspec.  If a row does
not have a value for a column specified in colspec, then that cell will
be populated with NA.

Prep work to allow all columns in a column family.

Use cols instead of colspec when getting column values.

modularise helper methods
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