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Is there a way to add a geometry column in hadoop? Please give me some getting-started tutorial for geoprocessing in hadoop. Like, I have a database which have point values and if I take a random point, I need to check all the values which come under 10km radius of that point.

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Have you looked at the Esri GIS Tools for Hadoop? It includes an implementation of ST_Geometry for Hive, in the Spatial Framework for Hadoop.

You can start with the samples.

There are example calls to the various ST_Geometry UDFs in the scripts under spatial-framework-for-hadoop/hive/test/.

(Disclosure: I'm a collaborator.) (Update: added more hyperlinks.)

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