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MDEV-25380: JSON_TABLE: Assertion `join->best_read < double(1.797...) fails

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The query used a subquery of this form:

SELECT ...
WHERE
   EXISTS( SELECT ...
           FROM JSON_TABLE(outer_ref, ..) as JT
           WHERE trivial_correlation_cond)

EXISTS-to-IN conversion code was unable to see that the subquery will
still be correlated after the trivial_correlation is removed, which
eventually caused a crash due to inability to construct a query plan.

Fixed by making Item_subselect::walk() also walk arguments of Table
Functions.
This commit is contained in:
Sergei Petrunia
2021-04-12 14:11:37 +03:00
committed by Alexey Botchkov
parent eb2550ee78
commit 4a10dd0253
5 changed files with 75 additions and 0 deletions
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3
sql/json_table.h
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@@ -200,6 +200,9 @@ public:
/*** Name resolution functions ***/
int setup(THD *thd, TABLE_LIST *sql_table, SELECT_LEX *s_lex);
int walk_items(Item_processor processor, bool walk_subquery,
void *argument);
/*** Functions for interaction with the Query Optimizer ***/
void fix_after_pullout(TABLE_LIST *sql_table,
st_select_lex *new_parent, bool merge);