[9.2] ESQL: Fix projection generation when pruning left join (#135446) #136078
+207
−33
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Currently, in case the join key is (locally) null, the whole join is replaced with an `Eval` and a `Project`. The project however contain only reference attributes. This is insufficient, in case the attribute should point to another attribute pointing to a literal `null` added in the `Eval`. This fixes that by allowing the generated `Project` to contain `NamedExpression`s, which can then be proper `Alias`es. This is done by adjusting the join output calculation to work with the `NamedExpression`s, instead of just `Attribute`s.
bpintea
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:Analytics/ES|QL
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Backports the following commits to 9.2: