[8.19] Use new source loader when lower docId is accessed (#128320) #128408
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When using synthetic source, runtime fields data may come from doc values. Doc values iterators can only be read once, and in increasing docId order. But if a runtime field is referenced multiple times in a query, currently the same doc value iterator will be used. This causes an error, as the second field reference will attempt to read the same iterator from a lower docId than was previously used. The fix is to create a new source loader, and thus a new doc value iterator, if the requested docId is lower than the last seen docId.
parkertimmins
added
:StorageEngine/Codec
>bug
auto-merge-without-approval
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Backports the following commits to 8.19: