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MDEV-18681 Server crashes in embedding_sjm

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Do not do substitution for best equal field in HAVING conditions.
It's not needed.
This commit is contained in:
Igor Babaev
2019-02-24 01:55:51 -08:00
parent 793f27a046
commit 31deef0953
3 changed files with 49 additions and 8 deletions
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19
sql/sql_select.cc
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@ -159,7 +159,8 @@ static COND *build_equal_items(JOIN *join, COND *cond,
static COND* substitute_for_best_equal_field(THD *thd, JOIN_TAB *context_tab,
COND *cond,
COND_EQUAL *cond_equal,
void *table_join_idx);
void *table_join_idx,
bool do_substitution);
static COND *simplify_joins(JOIN *join, List<TABLE_LIST> *join_list,
COND *conds, bool top, bool in_sj);
static bool check_interleaving_with_nj(JOIN_TAB *next);
@ -2304,7 +2305,7 @@ int JOIN::optimize_stage2()
if (conds)
{
conds= substitute_for_best_equal_field(thd, NO_PARTICULAR_TAB, conds,
cond_equal, map2table);
cond_equal, map2table, true);
if (unlikely(thd->is_error()))
{
error= 1;
@ -2320,7 +2321,7 @@ int JOIN::optimize_stage2()
if (having)
{
having= substitute_for_best_equal_field(thd, NO_PARTICULAR_TAB, having,
having_equal, map2table);
having_equal, map2table, false);
if (thd->is_error())
{
error= 1;
@ -2347,7 +2348,7 @@ int JOIN::optimize_stage2()
*tab->on_expr_ref= substitute_for_best_equal_field(thd, NO_PARTICULAR_TAB,
*tab->on_expr_ref,
tab->cond_equal,
map2table);
map2table, true);
if (unlikely(thd->is_error()))
{
error= 1;
@ -2377,7 +2378,7 @@ int JOIN::optimize_stage2()
while (equals)
{
ref_item= substitute_for_best_equal_field(thd, tab, ref_item,
equals, map2table);
equals, map2table, true);
if (unlikely(thd->is_fatal_error))
DBUG_RETURN(1);
@ -15418,7 +15419,8 @@ Item *eliminate_item_equal(THD *thd, COND *cond, COND_EQUAL *upper_levels,
static COND* substitute_for_best_equal_field(THD *thd, JOIN_TAB *context_tab,
COND *cond,
COND_EQUAL *cond_equal,
void *table_join_idx)
void *table_join_idx,
bool do_substitution)
{
Item_equal *item_equal;
COND *org_cond= cond; // Return this in case of fatal error
@ -15447,7 +15449,8 @@ static COND* substitute_for_best_equal_field(THD *thd, JOIN_TAB *context_tab,
{
Item *new_item= substitute_for_best_equal_field(thd, context_tab,
item, cond_equal,
table_join_idx);
table_join_idx,
do_substitution);
/*
This works OK with PS/SP re-execution as changes are made to
the arguments of AND/OR items only
@ -15529,7 +15532,7 @@ static COND* substitute_for_best_equal_field(THD *thd, JOIN_TAB *context_tab,
cond= eliminate_item_equal(thd, 0, cond_equal, item_equal);
return cond ? cond : org_cond;
}
else
else if (do_substitution)
{
while (cond_equal)
{