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The Table cell renderer is not invoked when the the columnClass uses its own renderer. I expect getTableCellRendererComponent(...) to be invoked which takes care of adding the tooltop.
fix available
http://hg.netbeans.org/main/rev/a94e9d16f210
Integrated into 'main-golden', available in NB_Trunk_Production #267 build Changeset: http://hg.netbeans.org/main/rev/a94e9d16f210 User: John Baker <jbaker@netbeans.org> Log: #137386 SQL History - tool tip is not appearing for table cells
Verified with build 080619.