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Note: This GUC was originally named enable_hashagg_disk when it appeared in commit1f39bce0, which added disk-based hash aggregation. It was subsequently renamed in commit92c58fd9. Author: Peter Geoghegan Reviewed-By: Jeff Davis, Álvaro Herrera Discussion: https://postgr.es/m/9d9d1e1252a52ea1bad84ea40dbebfd54e672a0f.camel%40j-davis.com Backpatch: 13-, where disk-based hash aggregation was introduced.