Does happybase support filters?

[shengjie-min]

I noticed that in the document:

scan(row_start=None, row_stop=None, row_prefix=None, columns=None, filter=None, timestamp=None, include_timestamp=False, batch_size=1000, limit=None)

The filter argument may be a filter string that will be applied at the server by the region servers.

Does the filter here mean column filters? what does "filter string" mean? in hbase shell, you use filter like this:

scan 'table', { COLUMNS => 'family:qualifier', FILTER =>
SingleColumnValueFilter.new
(Bytes.toBytes('family'),
Bytes.toBytes('qualifier'),
CompareFilter::CompareOp.valueOf('EQUAL'),
SubstringComparator.new('somevalue'))
}

How does it work using happybase ?

[wbolster]

HappyBase simply passes the filter argument to Table.scan() to the Thrift API. This string should use the filter string syntax used by the HBase Thrift API.

See these pages for more information:

• http://hbase.apache.org/book/thrift.html
• https://issues.apache.org/jira/browse/HBASE-4176
• http://stackoverflow.com/questions/11380897/how-to-use-method-scanneropenwithscan-and-filter-string-in-thrifts-c-to-a

[wbolster]

See #14.