This job bundle will submit a tile rendering job using Maya and V-Ray to create EXRs as output. It'll then use the Open Image IO tool to assemble them into a single image.
This job bundle relies on the V-Ray render handler in the Maya adaptor. The template defines a number of X and Y tiles which is used to split the output into evenly sized tiles that can be distributed across multiple render nodes.
See also the job bundle tile_render_with_maya_arnold for an example using Maya and Arnold and using FFmpeg to assemble PNG files into the final image.