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By default, records with an empty-string value in a join field are paired just like any other value, so two records both missing an ID get matched with each other -- rarely the intended behavior. --ignore-empty treats an empty-string join-field value as if the field were absent, on both the left and right files, so such records fall through to unpaired handling (--np/--ul/--ur) instead of cross-joining on the empty string. Wires the check through both the default half-streaming join and the -s/--sorted-input doubly-streaming join, which track left-file buckets independently and needed the same empty-aware key-presence check in JoinBucketKeeper. Co-authored-by: Claude Sonnet 5 <noreply@anthropic.com>
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mlr --icsv --ojson join --ignore-empty --ul --ur -j id -f test/input/join-1194-left.csv test/input/join-1194-right.csv
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