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| author | Nikita Malyavin <nikitamalyavin@gmail.com> | 2019-11-26 19:22:04 +1000 |
|---|---|---|
| committer | Sergei Golubchik <serg@mariadb.org> | 2020-03-31 17:42:34 +0200 |
| commit | 259fb1cbed4470636ff35df83e1c4ca966bb8159 (patch) | |
| tree | ca82142d15f878ea127f8dbde783cb91a1e13652 /sql/lex.h | |
| parent | 0515577d128318e1b62511846d88d0c56226168d (diff) | |
| download | mariadb-git-259fb1cbed4470636ff35df83e1c4ca966bb8159.tar.gz | |
MDEV-16978 Application-time periods: WITHOUT OVERLAPS
* The overlaps check is implemented on a handler level per row command.
It creates a separate cursor (actually, another handler instance) and
caches it inside the original handler, when ha_update_row or
ha_insert_row is issued. Cursor closes on unlocking the handler.
* Containing the same key in index means unique constraint violation
even in usual terms. So we fetch left and right neighbours and check
that they have same key prefix, excluding from the key only the period part.
If it doesnt match, then there's no such neighbour, and the check passes.
Otherwise, we check if this neighbour intersects with the considered key.
* The check does not introduce new error and fails with ER_DUPP_KEY error.
This might break REPLACE workflow and should be fixed separately
Diffstat (limited to 'sql/lex.h')
| -rw-r--r-- | sql/lex.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sql/lex.h b/sql/lex.h index a4442ee8529..30f330cedce 100644 --- a/sql/lex.h +++ b/sql/lex.h @@ -455,6 +455,7 @@ static SYMBOL symbols[] = { { "OUTER", SYM(OUTER)}, { "OUTFILE", SYM(OUTFILE)}, { "OVER", SYM(OVER_SYM)}, + { "OVERLAPS", SYM(OVERLAPS_SYM)}, { "OWNER", SYM(OWNER_SYM)}, { "PACKAGE", SYM(PACKAGE_MARIADB_SYM)}, { "PACK_KEYS", SYM(PACK_KEYS_SYM)}, |