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Previously, the code used a node label of zero both for strings that contain no bytes beyond the inner tuple's prefix, and for cases where an "allTheSame" inner tuple has to be split to allow a string with a different next byte to be inserted into it. Failing to distinguish these cases meant that if a string ending with the current prefix needed to be inserted into an allTheSame tuple, we got into an infinite loop, because after splitting the tuple we'd descend into the child allTheSame tuple and then find we need to split again. To fix, instead use -1 and -2 as the node labels for these two cases. This requires widening the node label type from "char" to int2, but fortunately SPGiST stores all pass-by-value node label types in their Datum representation, which means that this change is transparently upward compatible so far as the on-disk representation goes. We continue to recognize zero as a dummy node label for reading purposes, but will not attempt to push new index entries down into such a label, so that the loop won't occur even when dealing with an existing index. Per report from Teodor Sigaev. Back-patch to 9.2 where the faulty code was introduced. |
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