santongding

Results 2 issues of santongding

感觉仅仅是向后找并不能完全避免死锁, 目前我也没有想到有什么完善的解决办法, 望指教

- Previously, `Next` after a `Delete` opcode always end due to the cursor points to an empty node - According to https://www.sqlite.org/opcode.html#Delete, when encounter flag `OPFLAG_SAVEPOSITION`, should move cursor to...