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MDEV-7811: EXPLAIN/ANALYZE FORMAT=JSON should show subquery cache

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Fixes over the original patch:
- Fix variable/class/other names
- Fix the JSON output to be in line with the output of other JSON
  constructs we produce
This commit is contained in:
Sergei Petrunia
2015-07-01 20:03:29 +03:00
parent c6aee27b73
commit 9d2aa2b309
9 changed files with 195 additions and 183 deletions
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34
sql/sql_expression_cache.h
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@ -65,9 +65,9 @@ public:
virtual void init()= 0;
/**
Save this object's statistics into Expression_cache_stat object
Save this object's statistics into Expression_cache_tracker object
*/
virtual void flush_stat()= 0;
virtual void update_tracker()= 0;
};
struct st_table_ref;
@ -75,11 +75,11 @@ struct st_join_table;
class Item_field;
class Expression_cache_stat :public Sql_alloc
class Expression_cache_tracker :public Sql_alloc
{
public:
enum expr_cache_state {UNINITED, STOPPED, OK};
Expression_cache_stat(Expression_cache *c) :
Expression_cache_tracker(Expression_cache *c) :
cache(c), hit(0), miss(0), state(UNINITED)
{}
@ -91,10 +91,10 @@ public:
void set(ulong h, ulong m, enum expr_cache_state s)
{hit= h; miss= m; state= s;}
void flush_stat()
void fetch_current_stats()
{
if (cache)
cache->flush_stat();
cache->update_tracker();
}
};
@ -115,18 +115,20 @@ public:
bool is_inited() { return inited; };
void init();
void set_stat(Expression_cache_stat *st)
void set_tracker(Expression_cache_tracker *st)
{
stat= st;
flush_stat();
tracker= st;
update_tracker();
}
virtual void flush_stat()
virtual void update_tracker()
{
if (stat)
stat->set(hit, miss, (inited ? (cache_table ?
Expression_cache_stat::OK :
Expression_cache_stat::STOPPED) :
Expression_cache_stat::UNINITED));
if (tracker)
{
tracker->set(hit, miss, (inited ? (cache_table ?
Expression_cache_tracker::OK :
Expression_cache_tracker::STOPPED) :
Expression_cache_tracker::UNINITED));
}
}
private:
@ -139,7 +141,7 @@ private:
/* Thread handle for the temporary table */
THD *table_thd;
/* EXPALIN/ANALYZE statistics */
Expression_cache_stat *stat;
Expression_cache_tracker *tracker;
/* TABLE_REF for index lookup */
struct st_table_ref ref;
/* Cached result */