Batch: a batch's appends made at once (pure_list_add_many, a call a chunk of 128) when every list takes its items so (an event's list, no index into it, one append to it: FLAT not keyed at its end, DENSE by keys it holds at its count, HASHED by number; never past its arrays' limit) and the memory budget takes them all (each item only grows what it counts): columns grown and widened once, the first key there already the executor's EXISTS at its round; else round by round as before, tried at once again after a round that changed a list's form. 50,000 DENSE adds 5.18 to 0.65 ms (the compiled code 0.28). APPEND_SOURCE: keys there already at rounds q and p, keys past a DENSE list's from round p, two appends to one list, widened columns, under memory budgets (seeds 1, 2, 3, 5, 23 alike: 31,402 batches at once in seed 23's, 292 by the budget round by round)

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