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Lower MAX_DEPTH to 32. The old 128 was validated recursively, and a debug build overflows a default test-thread stack well before reaching it, so the depth guard itself could abort instead of refusing. Report the refused node by its own name instead of "unsupported", which is what every kind used to say. Add the multi-partition datanode case. It asserts the failure the review reproduced - a series chain cut by CoalescePartitionsExec no longer decodes - so the limitation stays visible and turns red when the region merge becomes chain-atomic. Reconcile the retained-rate comment with the values the test asserts. Signed-off-by: discord9 <discord9@163.com>