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Fix histogram memory management

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There are "local" histograms that are allocated by one thread for
one TABLE object, and "global" that are allocated for TABLE_SHARE.
This commit is contained in:
Sergei Petrunia
2021-08-29 23:55:39 +03:00
parent 032587e2dc
commit a93b377863
3 changed files with 50 additions and 11 deletions
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10
sql/sql_statistics.h
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@ -125,6 +125,7 @@ int read_statistics_for_tables(THD *thd, TABLE_LIST *tables);
int collect_statistics_for_table(THD *thd, TABLE *table);
void delete_stat_values_for_table_share(TABLE_SHARE *table_share);
int alloc_statistics_for_table(THD *thd, TABLE *table);
void free_statistics_for_table(THD *thd, TABLE *table);
int update_statistics_for_table(THD *thd, TABLE *table);
int delete_statistics_for_table(THD *thd, const LEX_CSTRING *db, const LEX_CSTRING *tab);
int delete_statistics_for_column(THD *thd, TABLE *tab, Field *col);
@ -176,6 +177,15 @@ public:
// Newer, JSON-based histograms may return 0.
virtual uint get_size()=0;
virtual ~Histogram_base()= default;
Histogram_base() : owner(NULL) {}
THD *get_owner() { return owner; }
void set_owner(THD *thd) { owner=thd; }
private:
// Owner is a thread that *exclusively* owns this histogram (and so can
// delete it at any time)
THD *owner;
};