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MDEV-3798: EXPLAIN UPDATE/DELETE

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- Add support for EXPLAIN INSERT.
This commit is contained in:
Sergey Petrunya
2013-10-07 17:29:51 +04:00
parent 69393db3d1
commit 98a8642fe8
11 changed files with 201 additions and 62 deletions
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48
sql/sql_explain.h
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@@ -37,10 +37,16 @@ class Explain_query;
class Explain_node : public Sql_alloc
{
public:
enum explain_node_type {EXPLAIN_UNION, EXPLAIN_SELECT, EXPLAIN_UPDATE, EXPLAIN_DELETE };
enum explain_node_type
{
EXPLAIN_UNION,
EXPLAIN_SELECT,
EXPLAIN_UPDATE,
EXPLAIN_DELETE,
EXPLAIN_INSERT
};
virtual enum explain_node_type get_type()= 0;
virtual int get_select_id()= 0;
/*
@@ -172,8 +178,10 @@ public:
bool using_filesort;
};
class Explain_delete;
class Explain_update;
class Explain_delete;
class Explain_insert;
/*
Explain structure for a query (i.e. a statement).
@@ -229,14 +237,20 @@ public:
/* Explain_delete inherits from Explain_update */
Explain_update *upd_del_plan;
/* Query "plan" for INSERTs */
Explain_insert *insert_plan;
/* Produce a tabular EXPLAIN output */
int print_explain(select_result_sink *output, uint8 explain_flags);
/* Send tabular EXPLAIN to the client */
int send_explain(THD *thd);
/* Return tabular EXPLAIN output as a text string */
bool print_explain_str(THD *thd, String *out_str);
/* If true, at least part of EXPLAIN can be printed */
bool have_query_plan() { return upd_del_plan!= NULL || get_node(1) != NULL; }
bool have_query_plan() { return insert_plan || upd_del_plan|| get_node(1) != NULL; }
MEM_ROOT *mem_root;
private:
Dynamic_array<Explain_union*> unions;
@@ -445,7 +459,7 @@ private:
/*
Query Plan Footprint for single-table UPDATE.
EXPLAIN structure for single-table UPDATE.
This is similar to Explain_table_access, except that it is more restrictive.
Also, it can have UPDATE operation options, but currently there aren't any.
@@ -482,8 +496,28 @@ public:
};
/*
EXPLAIN data structure for an INSERT.
At the moment this doesn't do much as we don't really have any query plans
for INSERT statements.
*/
class Explain_insert : public Explain_node
{
public:
StringBuffer<64> table_name;
enum explain_node_type get_type() { return EXPLAIN_INSERT; }
int get_select_id() { return 1; /* always root */ }
int print_explain(Explain_query *query, select_result_sink *output,
uint8 explain_flags);
};
/*
Explain data of a single-table DELETE.
EXPLAIN data of a single-table DELETE.
*/
class Explain_delete: public Explain_update