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BUG#15024: get_best_covering_ror_intersect() tries to build ROR-intersection

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by starting with an empty index set and adding indexes to it until it
becomes covering. If the set becomes covering after adding the first index,
return NULL and don't try constructing ROR-intersection of one index (which
caused a crash)
This commit is contained in:
unknown 2005-11-25 20:47:22 +03:00
parent dc8a5d54bd
commit 08a4868bb6
1 changed files with 4 additions and 4 deletions
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8
sql/opt_range.cc
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@ -3136,10 +3136,10 @@ TRP_ROR_INTERSECT *get_best_covering_ror_intersect(PARAM *param,
/* F=F-covered by first(I) */
bitmap_union(&covered_fields, &(*ror_scan_mark)->covered_fields);
all_covered= bitmap_is_subset(&param->needed_fields, &covered_fields);
} while (!all_covered && (++ror_scan_mark < ror_scans_end));
if (!all_covered)
DBUG_RETURN(NULL); /* should not happen actually */
} while ((++ror_scan_mark < ror_scans_end) && !all_covered);
if (!all_covered || (ror_scan_mark - tree->ror_scans) == 1)
DBUG_RETURN(NULL);
/*
Ok, [tree->ror_scans .. ror_scan) holds covering index_intersection with