Helper base class to host HAVING, ORDER BY and GROUP BY subquery nodes. More...

Inheritance diagram for opt_explain_json_namespace::unit_ctx:

Public Member Functions
	unit_ctx (enum_parsing_context type_arg, const char name_arg, context parent_arg)

bool	has_no_subqueries () const
	Helper function to distinguish subquery-less nodes. More...

bool	format_query_expression (Opt_trace_context *json) override
	Helper function to format output for HAVING, ORDER/GROUP BY subqueries. More...

bool	add_subquery (subquery_list_enum subquery_type, subquery_ctx *ctx) override
	Append a subquery node to the specified list of the unit node. More...

Public Member Functions inherited from opt_explain_json_namespace::context
	context (enum_parsing_context type_arg, const char name_arg, context parent_arg)

virtual	~context ()=default

virtual bool	format (Opt_trace_context *json)
	Pass the node with its child nodes to a JSON formatter. More...

bool	is_query_block () const

virtual size_t	id (bool hide=false)=0
	Analogue of the "id" column in the traditional EXPLAIN output. More...

virtual bool	cacheable ()

virtual bool	dependent ()

virtual class qep_row *	entry ()

virtual enum_mod_type	get_mod_type ()

virtual void	set_child (context *)
	Associate a child node with this node. More...

virtual void	set_setop_result (setop_result_ctx *)
	associate CTX_UNION_RESULT node with CTX_UNION node More...

virtual bool	format_nested_loop (Opt_trace_context *json)
	Format nested loop join subtree (if any) to JSON formatter. More...

virtual bool	add_join_tab (joinable_ctx *ctx)
	Add a CTX_QEP_TAB node to a CTX_JOIN node. More...

virtual void	set_sort (sort_ctx *ctx)
	Set nested ORDER BY/GROUP BY/DISTINCT node to `ctx`. More...

virtual void	set_window (window_ctx *ctx)
	Set nested WINDOW node to `ctx`. More...

virtual bool	add_query_spec (context *ctx)
	Add a query specification node to the CTX_UNION node. More...

virtual bool	find_and_set_derived (context *subquery)
	Try to associate a derived subquery node with this or underlying node. More...

virtual int	add_where_subquery (subquery_ctx ctx, Query_expression subquery)
	Associate WHERE subqueries of given context and unit with this object. More...

virtual bool	format_derived (Opt_trace_context *)
	Helper function to format output for derived subquery if any. More...

virtual bool	format_where (Opt_trace_context *)
	Helper function to format output for associated WHERE subqueries if any. More...

Public Member Functions inherited from Explain_context
	Explain_context (enum_parsing_context type_arg)

Private Attributes
List< subquery_ctx >	subquery_lists [SQ_total]

Additional Inherited Members
Public Attributes inherited from opt_explain_json_namespace::context
context *	parent
	link to parent node or NULL More...

Public Attributes inherited from Explain_context
enum_parsing_context	type
	type tag More...

Protected Attributes inherited from opt_explain_json_namespace::context
const char *	name

Detailed Description

Helper base class to host HAVING, ORDER BY and GROUP BY subquery nodes.

Constructor & Destructor Documentation

◆ unit_ctx()

opt_explain_json_namespace::unit_ctx::unit_ctx	(	enum_parsing_context	type_arg,
		const char *	name_arg,
		context *	parent_arg
	)

inline

Member Function Documentation

◆ add_subquery()

bool opt_explain_json_namespace::unit_ctx::add_subquery	(	subquery_list_enum	subquery_type,
		subquery_ctx *	ctx
	)

inlineoverridevirtual

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 from opt_explain_json_namespace::context.

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

◆ format_query_expression()

bool opt_explain_json_namespace::unit_ctx::format_query_expression ( Opt_trace_context * )

inlineoverridevirtual

Helper function to format output for HAVING, ORDER/GROUP BY subqueries.

Reimplemented from opt_explain_json_namespace::context.

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

◆ has_no_subqueries()

bool opt_explain_json_namespace::unit_ctx::has_no_subqueries ( ) const

inline

Helper function to distinguish subquery-less nodes.

Return values

true	Node hosts no subqueries
false	Node hosts some subqueries

Member Data Documentation

◆ subquery_lists

List<subquery_ctx> opt_explain_json_namespace::unit_ctx::subquery_lists[SQ_total]

private

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

sql/opt_explain_json.cc

Public Member Functions

Private Attributes

Additional Inherited Members