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6fd144e3a9
dsa_dump would print a large negative number instead of zero for segment bin 0. Fix by explicitly checking for underflow and add special case for bin 0. Backpatch to all supported versions. Author: Ian Ilyasov <ianilyasov@outlook.com> Reviewed-by: Robert Haas <robertmhaas@gmail.com> Discussion: https://postgr.es/m/GV1P251MB1004E0D09D117D3CECF9256ECD502@GV1P251MB1004.EURP251.PROD.OUTLOOK.COM Backpatch-through: v12