opt_explain_json_namespace::subquery_ctx Class Reference

Inheritance diagram for opt_explain_json_namespace::subquery_ctx:

Collaboration diagram for opt_explain_json_namespace::subquery_ctx:

Public Member Functions
	subquery_ctx (Explain_context_enum type_arg, const char *name_arg, context *parent_arg)
virtual qep_row *	entry ()
virtual bool	cacheable ()
virtual bool	dependent ()
virtual bool	format (Opt_trace_context *json)
virtual void	set_child (context *child)
virtual size_t	id (bool hide)
Public Member Functions inherited from opt_explain_json_namespace::context
	context (Explain_context_enum type_arg, const char *name_arg, context *parent_arg)
bool	is_query_block () const
virtual void	set_union_result (union_result_ctx *ctx)
	associate CTX_UNION_RESULT node with CTX_UNION node
virtual bool	add_subquery (subquery_list_enum subquery_type, subquery_ctx *ctx)
virtual bool	format_nested_loop (Opt_trace_context *json)
virtual bool	add_join_tab (joinable_ctx *ctx)
virtual void	set_sort (sort_ctx *ctx)
virtual bool	add_query_spec (context *ctx)
virtual bool	find_and_set_derived (context *subquery)
virtual bool	add_where_subquery (subquery_ctx *ctx, SELECT_LEX_UNIT *subquery)
virtual bool	format_derived (Opt_trace_context *json)
	Helper function to format output for derived subquery if any.
virtual bool	format_where (Opt_trace_context *json)
	Helper function to format output for associated WHERE subqueries if any.
virtual bool	format_unit (Opt_trace_context *json)
	Helper function to format output for HAVING, ORDER/GROUP BY subqueries.
Public Member Functions inherited from Explain_context
	Explain_context (Explain_context_enum type_arg)
Public Member Functions inherited from qep_row
void	cleanup ()
virtual void	register_where_subquery (SELECT_LEX_UNIT *subquery)

Additional Inherited Members
Static Public Member Functions inherited from Sql_alloc
static void *	operator new (size_t size) throw ()
static void *	operator new[] (size_t size) throw ()
static void *	operator new[] (size_t size, MEM_ROOT *mem_root) throw ()
static void *	operator new (size_t size, MEM_ROOT *mem_root) throw ()
static void	operator delete (void *ptr, size_t size)
static void	operator delete (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, MEM_ROOT *mem_root)
static void	operator delete[] (void *ptr, size_t size)
Public Attributes inherited from opt_explain_json_namespace::context
context *	parent
	link to parent node or NULL
Public Attributes inherited from qep_row
column< uint >	col_id
	"id" column: seq. number of SELECT withing the query
column< SELECT_LEX::type_enum >	col_select_type
	"select_type" column
mem_root_str	col_table_name
	"table" to which the row of output refers
List< const char >	col_partitions
	"partitions" column
mem_root_str	col_join_type
	"type" column, see join_type_str array
List< const char >	col_possible_keys
	"possible_keys": comma-separated list
mem_root_str	col_key
	"key" column: index that is actually decided to use
mem_root_str	col_key_len
	"key_length" column: length of the "key" above
List< const char >	col_ref
	"ref":columns/constants which are compared to "key"
column< longlong >	col_rows
	"rows": estimated number of examined table rows
column< float >	col_filtered
	"filtered": % of rows filtered by condition
List< extra >	col_extra
	"extra" column (traditional) or property list
mem_root_str	col_message
	replaces "Extra" column if not empty
mem_root_str	col_attached_condition
	former "Using where"
uint	query_block_id
	query block id for materialized subqueries
List < opt_explain_json_namespace::context >	derived_from
List< const char >	col_key_parts
	used parts of the key
bool	is_dependent
bool	is_cacheable
bool	using_temporary
bool	is_materialized_from_subquery
bool	is_update
bool	is_delete
Protected Attributes inherited from opt_explain_json_namespace::context
const char *	name

Detailed Description

Node class to wrap a subquery node tree

Implements CTX_WHERE, CTX_HAVING, CTX_ORDER_BY_SQ, CTX_GROUP_BY_SQ and CTX_OPTIMIZED_AWAY_SUBQUERY context nodes. This class hosts underlying join_ctx or uion_ctx.

Definition at line 319 of file opt_explain_json.cc.

Member Function Documentation

virtual bool opt_explain_json_namespace::subquery_ctx::format ( Opt_trace_context *  json )

inlinevirtual

Pass the node with its child nodes to a JSON formatter

Parameters

json

Formatter

Return values

false	Ok
true	Error

Note

The join_ctx class overloads this function.

Reimplemented from opt_explain_json_namespace::context.

Definition at line 352 of file opt_explain_json.cc.

virtual size_t opt_explain_json_namespace::subquery_ctx::id ( bool  hide )

inlinevirtual

Analogue of the "id" column in the traditional EXPLAIN output

Parameters

hide	if true, ban the output of K_SELECT_ID JSON property in the underlying table_with_where_and_derived_ctx objects

Returns

"Select number" that is associated with this node

Implements opt_explain_json_namespace::context.

Definition at line 437 of file opt_explain_json.cc.

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virtual void opt_explain_json_namespace::subquery_ctx::set_child ( context *  child )

inlinevirtual

Associate a child node with this node

This function is to be overloaded by subquery_ctx.

Reimplemented from opt_explain_json_namespace::context.

Definition at line 430 of file opt_explain_json.cc.

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The documentation for this class was generated from the following file:

• sql/opt_explain_json.cc