Inheritance 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 ()

Detailed Description

Formatter class for EXPLAIN FORMAT=JSON output

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

bool Explain_format_JSON::end_context ( Explain_context_enum context ) [virtual]

Leave the current context

Parameters:

context current context type (for validation/debugging)

qep_row * Explain_format_JSON::entry ( ) [virtual]

Get a pointer to the current TABLE/JOIN_TAB property set

virtual bool Explain_format_JSON::flush_entry ( ) [inline, virtual]

Flush TABLE/JOIN_TAB property set

For traditional EXPLAIN: output a single EXPLAIN row.

virtual bool Explain_format_JSON::is_hierarchical ( ) const [inline, virtual]

A hierarchical text or a plain table

Return values:

true	Formatter produces hierarchical text
false	Traditional explain

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.

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