wrong result of substring when the second argument of substring is negative #9604
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same issue of pingcap/tidb#56650
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This bug affects the 5.4.x(LTS) versions.This bug affects the 6.1.x(LTS) versions.This bug affects the 6.5.x(LTS) versions.This bug affects the 7.1.x(LTS) versions.This bug affects the 7.5.x(LTS) versions.This bug affects the 8.1.x(LTS) versions.This bug affects the 8.5.x(LTS) versions.The issue is confirmed as a bug.