opt_explain_json_namespace::duplication_weedout_ctx Class Reference

Inheritance diagram for opt_explain_json_namespace::duplication_weedout_ctx:

List of all members.

Public Member Functions
	duplication_weedout_ctx (context *parent_arg)
virtual size_t	id (bool hide)
virtual bool	cacheable ()
virtual bool	dependent ()
virtual bool	add_join_tab (joinable_ctx *ctx)
virtual bool	add_subquery (subquery_list_enum subquery_type, subquery_ctx *ctx)
virtual bool	add_where_subquery (subquery_ctx *ctx, SELECT_LEX_UNIT *subquery)
virtual bool	find_and_set_derived (context *subquery)
virtual bool	format_nested_loop (Opt_trace_context *json)
virtual bool	format_unit (Opt_trace_context *json)
	Helper function to format output for HAVING, ORDER/GROUP BY subqueries.
virtual void	set_sort (sort_ctx *ctx)

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Detailed Description

Context class to represent JOIN_TABs in duplication weedout sequence

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Member Function Documentation

virtual bool opt_explain_json_namespace::duplication_weedout_ctx::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 from opt_explain_json_namespace::join_ctx.

virtual bool opt_explain_json_namespace::duplication_weedout_ctx::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 from opt_explain_json_namespace::join_ctx.

virtual bool opt_explain_json_namespace::duplication_weedout_ctx::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 from opt_explain_json_namespace::join_ctx.

virtual bool opt_explain_json_namespace::duplication_weedout_ctx::find_and_set_derived

(

context *

subquery

)

[inline, virtual]

Associate a CTX_DERIVED node with its CTX_JOIN_TAB node

Parameters:

subquery

derived subquery tree

Reimplemented from opt_explain_json_namespace::join_ctx.

virtual bool opt_explain_json_namespace::duplication_weedout_ctx::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 from opt_explain_json_namespace::join_ctx.

virtual size_t opt_explain_json_namespace::duplication_weedout_ctx::id

(

bool

hide

)

[inline, 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

Reimplemented from opt_explain_json_namespace::join_ctx.

virtual void opt_explain_json_namespace::duplication_weedout_ctx::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 from opt_explain_json_namespace::join_ctx.

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

• opt_explain_json.cc