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Fix thinko in safeguard for negative availMem.
Also, use pass read_buffer_size * numInputTapes rather than just availMem to USEMEM, to be neat. Peter Geoghegan.
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@ -2669,8 +2669,8 @@ mergeruns(Tuplesortstate *state)
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(state->availMem) / 1024, numInputTapes);
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#endif
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state->read_buffer_size = Min(state->availMem / numInputTapes, 0);
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USEMEM(state, state->availMem);
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state->read_buffer_size = Max(state->availMem / numInputTapes, 0);
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USEMEM(state, state->read_buffer_size * numInputTapes);
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/* End of step D2: rewind all output tapes to prepare for merging */
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for (tapenum = 0; tapenum < state->tapeRange; tapenum++)
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