GH-15243: [C++] fix for potential deadlock in the group-by node#33700

westonpace merged 1 commit intoapache:masterapache/arrow:masterfrom

westonpace:bugfix/GH-15243--timeout-on-plan-testwestonpace/arrow:bugfix/GH-15243--timeout-on-plan-testCopy head branch name to clipboard