introduce legacy incremental executor #4546
Merged
+6,681
−6
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#4319 claimed this was not possible, but I cannot understand why from my previous comment.
Note: the legacy incremental executor is a branching executor, it uses the legacy format that duplicates fields within the response as well as the underlying legacy behavior in which those fields are re-executed, with potentially conflicting field values. In particular, nulls may bubble up in one branch and not another. The transformer approach from #4319 keeps the legacy format without re-executing because it transforms the non-branching incremental executor response.