Inheritance diagram for opt_explain_json_namespace::context:

Public Member Functions
	context (Explain_context_enum type_arg, const char name_arg, context parent_arg)
virtual bool	format (Opt_trace_context *json)
bool	is_query_block () const
virtual size_t	id (bool hide=false)=0
virtual bool	cacheable ()
virtual bool	dependent ()
virtual class qep_row *	entry ()
virtual void	set_child (context *child)
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 Attributes
context *	parent
	link to parent node or NULL
Protected Attributes
const char *	name

Detailed Description

Base class for all intermediate tree nodes

Member Function Documentation

virtual bool opt_explain_json_namespace::context::add_join_tab ( joinable_ctx * ctx ) [inline, virtual]

Add a CTX_JOIN_TAB node to a CTX_JOIN node

Parameters:

ctx	CTX_JOIN_TAB node

Return values:

false	Ok
true	Error

Reimplemented in opt_explain_json_namespace::duplication_weedout_ctx, opt_explain_json_namespace::materialize_ctx, opt_explain_json_namespace::join_ctx, and opt_explain_json_namespace::simple_sort_ctx.

virtual bool opt_explain_json_namespace::context::add_query_spec ( context * ctx ) [inline, virtual]

Add a query specification node to the CTX_UNION node

Parameters:

ctx	query specification node

Return values:

false	Ok
true	Error

Reimplemented in opt_explain_json_namespace::union_ctx.

virtual bool opt_explain_json_namespace::context::add_subquery	(	subquery_list_enum	subquery_type,
		subquery_ctx *	ctx
	)		`[inline, virtual]`

Append a subquery node to the specified list of the unit node

Parameters:

subquery_type	Describes the Item tree where the subquery exists
ctx	Subquery node

Return values:

false	Ok
true	Error

Reimplemented in opt_explain_json_namespace::duplication_weedout_ctx, opt_explain_json_namespace::materialize_ctx, opt_explain_json_namespace::sort_with_subqueries_ctx, opt_explain_json_namespace::join_ctx, opt_explain_json_namespace::simple_sort_with_subqueries_ctx, opt_explain_json_namespace::union_result_ctx, and opt_explain_json_namespace::unit_ctx.

virtual bool opt_explain_json_namespace::context::add_where_subquery	(	subquery_ctx *	ctx,
		SELECT_LEX_UNIT *	subquery
	)		`[inline, virtual]`

Associate WHERE subqueries of given context and unit with this object

Parameters:

ctx	Context of WHERE subquery
subquery	For CTX_JOIN_TAB: match given unit with a previously collected by the register_where_subquery function.

Reimplemented in opt_explain_json_namespace::duplication_weedout_ctx, opt_explain_json_namespace::materialize_ctx, opt_explain_json_namespace::join_ctx, opt_explain_json_namespace::simple_sort_ctx, opt_explain_json_namespace::join_tab_ctx, and opt_explain_json_namespace::message_ctx.

virtual bool opt_explain_json_namespace::context::find_and_set_derived ( context * subquery ) [inline, virtual]

Try to associate a derived subquery node with this or underlying node

Parameters:

subquery Derived subquery node

Return values:

true	Success
false	Can't associate: this node or its child nodes are not derived from the subquery

Reimplemented in opt_explain_json_namespace::duplication_weedout_ctx, opt_explain_json_namespace::materialize_ctx, opt_explain_json_namespace::join_ctx, opt_explain_json_namespace::simple_sort_ctx, opt_explain_json_namespace::join_tab_ctx, and opt_explain_json_namespace::message_ctx.

virtual bool opt_explain_json_namespace::context::format ( Opt_trace_context * json ) [inline, virtual]

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 in opt_explain_json_namespace::union_result_ctx, and opt_explain_json_namespace::subquery_ctx.

virtual bool opt_explain_json_namespace::context::format_nested_loop ( Opt_trace_context * json ) [inline, virtual]

Format nested loop join subtree (if any) to JSON formatter

Parameters:

json Formatter

Return values:

false	Ok
true	Error

Reimplemented in opt_explain_json_namespace::duplication_weedout_ctx, opt_explain_json_namespace::materialize_ctx, and opt_explain_json_namespace::join_ctx.

virtual size_t opt_explain_json_namespace::context::id ( bool hide = false ) [pure virtual]

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

virtual void opt_explain_json_namespace::context::set_child ( context * child ) [inline, virtual]

Associate a child node with this node

This function is to be overloaded by subquery_ctx.

Reimplemented in opt_explain_json_namespace::subquery_ctx.

virtual void opt_explain_json_namespace::context::set_sort ( sort_ctx * ctx ) [inline, virtual]

Set nested ORDER BY/GROUP BY/DISTINCT node to ctx

Parameters:

json Formatter

Return values:

false	Ok
true	Error

Reimplemented in opt_explain_json_namespace::duplication_weedout_ctx, opt_explain_json_namespace::materialize_ctx, and opt_explain_json_namespace::join_ctx.

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

opt_explain_json.cc

Public Member Functions

Public Attributes

Protected Attributes

Detailed Description

Member Function Documentation