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mdbx: исправление put(MDBX_UPSERT+MDBX_ALLDUPS) для случая замены всех значений в subDb.

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Fixed cursor_put_nochecklen() internals for case when dupsort'ed named subDb
contains a single key with multiple values (aka duplicates), which are replaced
with a single value by put-operation with the `MDBX_UPSERT+MDBX_ALLDUPS` flags.

In this case, the database becomes completely empty, without any pages.
However exactly this condition was not considered and
thus wasn't handled correctly.

Fixes https://gitflic.ru/project/erthink/libmdbx/issue/8

Thanks Masatoshi Fukunaga <https://gitflic.ru/user/mah0x211> for reporting.
This commit is contained in:
Леонид Юрьев (Leonid Yuriev)
2023-02-01 01:03:51 +03:00
parent 209f784ee7
commit fb827959a9
2 changed files with 11 additions and 2 deletions
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2
src/core.c
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@@ -17275,7 +17275,7 @@ static __hot int cursor_put_nochecklen(MDBX_cursor *mc, const MDBX_val *key,
if (unlikely(err != MDBX_SUCCESS))
return err;
flags -= MDBX_ALLDUPS;
rc = MDBX_NOTFOUND;
rc = mc->mc_snum ? MDBX_NOTFOUND : MDBX_NO_ROOT;
exact = false;
} else if (!(flags & (MDBX_RESERVE | MDBX_MULTIPLE))) {
/* checking for early exit without dirtying pages */