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Could anybody tell me the meaning of geom_way column generated by osm2po?

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It is the geometry in WKB format. It's often named the_geom. You can modify the pgRouting writer plugin when you prefer another name:

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Does this data needed for short path search? – Alexey Zakharov Aug 27 '12 at 12:30
Not needed if you use the Dijkstra Algorithm, though x/y values of start and end node might be pre-calculated already. But you usually want to use the line geometry to draw the route later. – dkastl Aug 27 '12 at 14:29

Another way: Open the generated SQL-File in an editor and modify the name in line 10.

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