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Resolves #643 Use sub-fragments for additional parallelism and better load balance. Works for aggregates only for now. * Add initial sub-fragments support. Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * Fix review comments Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * Rename sub-fragments and use them for CPU only. Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * Fix groupby detection and hold fetched chunks in sub-tasks. Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * Fix inner table iteration for sub-tasks. Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * Adjust HighCardinalityGroupByTest to sub-tasks. Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * Add exception handling for KernelSubtask Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * fix build Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> * Add comments Signed-off-by: ienkovich <[email protected]> Signed-off-by: Yoon-Min Nam <[email protected]> Co-authored-by: ienkovich <[email protected]>
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