[8.19] Fix integer overflow in block memory estimation (#138132) #138180
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When constructing a very large block, the memory estimate (multiplying two int values) can overflow, yielding a negative value instead of several GB. The negative estimate bypasses the circuit breaker, so the allocation proceeds and may lead to OOM. This change fixes the overflow by casting to long before multiplication so the breaker can trigger correctly. We should avoid allocating a gigantic contiguous primitive array; once size crosses a threshold we should switch to BigArray. I will address it in a follow-up.
dnhatn
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Backports the following commits to 8.19: