[8.x] ESQL: tests for LOOKUP JOIN with non-unique join keys (#118471) #118661
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Add a csv dataset and tests for `LOOKUP JOIN` where the join keys are not unique. In particular, add tests that include MVs and nulls to see how `LOOKUP JOIN` treats these.
alex-spies
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:Analytics/ES|QL
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Backports the following commits to 8.x: