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MDEV-18755 Assertion `inited==INDEX' failed in handler::ha_index_read_map

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When the chosen execution plan accesses a join table employing a range
rowid filter a quick select to scan this range has to be built. This
quick select is built by a call of SQL_SELECT::test_quick_select().
At this call the function should allow to evaluate only single index
range scans. In order to be able to do this a new parameter was added
to this function.
This commit is contained in:
Igor Babaev
2019-02-28 14:44:38 -08:00
parent b10340998f
commit 5a0874449a
7 changed files with 180 additions and 17 deletions
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19
sql/opt_range.cc
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@ -2586,6 +2586,9 @@ static int fill_used_fields_bitmap(PARAM *param)
limit Query limit
force_quick_range Prefer to use range (instead of full table scan) even
if it is more expensive.
remove_false_parts_of_where Remove parts of OR-clauses for which range
analysis produced SEL_TREE(IMPOSSIBLE)
only_single_index_range_scan Evaluate only single index range scans
NOTES
Updates the following in the select parameter:
@ -2644,7 +2647,8 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
table_map prev_tables,
ha_rows limit, bool force_quick_range,
bool ordered_output,
bool remove_false_parts_of_where)
bool remove_false_parts_of_where,
bool only_single_index_range_scan)
{
uint idx;
double scan_time;
@ -2824,7 +2828,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
}
TABLE_READ_PLAN *best_trp= NULL;
TRP_GROUP_MIN_MAX *group_trp;
TRP_GROUP_MIN_MAX *group_trp= NULL;
double best_read_time= read_time;
if (cond)
@ -2859,7 +2863,8 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
Try to construct a QUICK_GROUP_MIN_MAX_SELECT.
Notice that it can be constructed no matter if there is a range tree.
*/
group_trp= get_best_group_min_max(&param, tree, best_read_time);
if (!only_single_index_range_scan)
group_trp= get_best_group_min_max(&param, tree, best_read_time);
if (group_trp)
{
param.table->quick_condition_rows= MY_MIN(group_trp->records,
@ -2907,7 +2912,8 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
table deletes.
*/
if ((thd->lex->sql_command != SQLCOM_DELETE) &&
optimizer_flag(thd, OPTIMIZER_SWITCH_INDEX_MERGE))
optimizer_flag(thd, OPTIMIZER_SWITCH_INDEX_MERGE) &&
!only_single_index_range_scan)
{
/*
Get best non-covering ROR-intersection plan and prepare data for
@ -2935,7 +2941,8 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
*/
if (param.table->covering_keys.is_clear_all() &&
optimizer_flag(thd, OPTIMIZER_SWITCH_INDEX_MERGE) &&
optimizer_flag(thd, OPTIMIZER_SWITCH_INDEX_MERGE_SORT_INTERSECT))
optimizer_flag(thd, OPTIMIZER_SWITCH_INDEX_MERGE_SORT_INTERSECT) &&
!only_single_index_range_scan)
{
if ((intersect_trp= get_best_index_intersect(&param, tree,
best_read_time)))
@ -2948,7 +2955,7 @@ int SQL_SELECT::test_quick_select(THD *thd, key_map keys_to_use,
}
if (optimizer_flag(thd, OPTIMIZER_SWITCH_INDEX_MERGE) &&
head->stat_records() != 0)
head->stat_records() != 0 && !only_single_index_range_scan)
{
/* Try creating index_merge/ROR-union scan. */
SEL_IMERGE *imerge;