{"id":"sort-merge-join-detects-presorted-input","text":"`SortMergeJoin` inspects whether input is already sorted and reports this via `stats[\"sorted_input\"]`, allowing it to skip the sort step on pre-sorted data","truth_value":"IN","source":"entries/2026/05/29/map-side-join-test_map_side_joins.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"explanation":{"steps":[{"node":"sort-merge-join-detects-presorted-input","truth_value":"IN","reason":"premise"}]}}