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MDEV-30395 Wrong result with semijoin and Federated as outer table

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The problem was that federated engine does not support comparable rowids
which was not taken into account by semijoin code.

Fixed by checking that we don't use semijoin with tables that does not
support comparable rowids.

Other things:
- Fixed some typos in the code comments
This commit is contained in:
Monty
2023-01-12 22:31:18 +02:00
parent 0595dd0f56
commit 981a6b7044
6 changed files with 89 additions and 7 deletions
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4
sql/handler.h
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@ -356,9 +356,9 @@ enum chf_create_flags {
Rowid's are not comparable. This is set if the rowid is unique to the
current open handler, like it is with federated where the rowid is a
pointer to a local result set buffer. The effect of having this set is
that the optimizer will not consirer the following optimizations for
that the optimizer will not consider the following optimizations for
the table:
ror scans or filtering
ror scans, filtering or duplicate weedout
*/
#define HA_NON_COMPARABLE_ROWID (1ULL << 60)