Explain_format_JSON Class Reference

#include <opt_explain_json.h>

Inheritance diagram for Explain_format_JSON:

Collaboration diagram for Explain_format_JSON:

Public Member Functions
virtual bool	is_hierarchical () const
virtual bool	send_headers (select_result *result)
virtual bool	begin_context (Explain_context_enum context, SELECT_LEX_UNIT *subquery, const Explain_format_flags *flags)
virtual bool	end_context (Explain_context_enum context)
virtual bool	flush_entry ()
virtual qep_row *	entry ()

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 Explain_format
select_result *	output
	output resulting data there

Detailed Description

Formatter class for EXPLAIN FORMAT=JSON output

Definition at line 31 of file opt_explain_json.h.

Member Function Documentation

bool Explain_format_JSON::begin_context ( Explain_context_enum  context, SELECT_LEX_UNIT *  subquery, const Explain_format_flags *  flags  )

virtual

Enter a specified context

Parameters

context	context type
subquery	for CTX_WHERE: unit of the subquery

Implements Explain_format.

Definition at line 1487 of file opt_explain_json.cc.

bool Explain_format_JSON::end_context ( Explain_context_enum  context )

virtual

Leave the current context

Parameters

context

current context type (for validation/debugging)

Implements Explain_format.

Definition at line 1816 of file opt_explain_json.cc.

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qep_row * Explain_format_JSON::entry ( )

virtual

Get a pointer to the current TABLE/JOIN_TAB property set

Implements Explain_format.

Definition at line 1481 of file opt_explain_json.cc.

virtual bool Explain_format_JSON::flush_entry ( )

inlinevirtual

Flush TABLE/JOIN_TAB property set

For traditional EXPLAIN: output a single EXPLAIN row.

Implements Explain_format.

Definition at line 46 of file opt_explain_json.h.

virtual bool Explain_format_JSON::is_hierarchical ( ) const

inlinevirtual

A hierarchical text or a plain table

Return values

true	Formatter produces hierarchical text
false	Traditional explain

Implements Explain_format.

Definition at line 40 of file opt_explain_json.h.

bool Explain_format_JSON::send_headers ( select_result *  result )

virtual

Send EXPLAIN header item(s) to output stream

Note

: This function caches the output result set pointer for further use.

Parameters

result

output result set

Return values

false	OK
true	Error

Reimplemented from Explain_format.

Definition at line 1877 of file opt_explain_json.cc.

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

• sql/opt_explain_json.h
• sql/opt_explain_json.cc