[8.19] Avoid dropping aggregate groupings in local plans (#129370) #130055
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The local plan optimizer should not change the layout, as it has already been agreed upon. However, CombineProjections can violate this when some grouping elements refer to the same attribute. This occurs when ReplaceFieldWithConstantOrNull replaces missing fields with the same reference for a given data type. Closes elastic#128054 Closes elastic#129811 (cherry picked from commit 2bc6284)
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