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“v1.8+: the output options have changed. Map-reduce no longer generates temporary collections…“. Does it mean I have to manually delete map-reduce produced collection, or there is still a way to say map-reduce: I need this output as an temporary intermediate storage only, remove it as soon as you done?
Yes, you need to either manually remove the named collection identified in the output option (once you’re done with it), or use the
{ inline: 1 }output option which returns the output from RAM (and live with that output option’s limitations).