[8.x] ESQL: optimise aggregations filtered by false/null into evals (#115858) #116713
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…c#115858) This adds a new optimiser rule to extract aggregate functions filtered by a `FALSE` or `NULL` into evals. The value taken by the evaluation is `0L`, for `COUNT()` and `COUNT_DISTINCT()`, `NULL` otherwise. Example: ``` ... | STATS x = someAgg(y) WHERE FALSE {BY z} | ... => ... | STATS x = someAgg(y) {BY z} > | EVAL x = NULL | KEEP x{, z} | ... ``` Related: elastic#114352.
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:Analytics/ES|QL
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Backports the following commits to 8.x: