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Tom Lane ec0294fb2c Support negative indexes in split_part(). ... This provides a handy way to get, say, the last field of the string. Use of a negative index in this way has precedent in the nearby left() and right() functions. The implementation scans the string twice when N < -1, but it seems likely that N = -1 will be the huge majority of actual use cases, so I'm not really excited about adding complexity to avoid that. Nikhil Benesch, reviewed by Jacob Champion; cosmetic tweakage by me Discussion: https://postgr.es/m/cbb7f861-6162-3a51-9823-97bc3aa0b638@gmail.com		5 years ago
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src	Support negative indexes in split_part().	5 years ago
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