Explain_no_table Class Reference

Inheritance diagram for Explain_no_table:

Collaboration diagram for Explain_no_table:

Public Member Functions
	Explain_no_table (THD *thd_arg, JOIN *join_arg, const char *message_arg)
	Explain_no_table (THD *thd_arg, const char *message_arg, ha_rows rows_arg=HA_POS_ERROR)
Public Member Functions inherited from Explain
bool	send ()

Protected Member Functions
virtual bool	shallow_explain ()
virtual bool	explain_rows_and_filtered ()
virtual bool	explain_extra ()
Protected Member Functions inherited from Explain
	Explain (Explain_context_enum context_type_arg, THD *thd_arg, JOIN *join_arg=NULL)
bool	explain_subqueries (select_result *result)
bool	mark_subqueries (Item *item, qep_row *destination, Explain_context_enum type)
bool	mark_order_subqueries (const JOIN::ORDER_with_src &order)
bool	prepare_columns ()
bool	describe (uint8 mask) const
SELECT_LEX *	select_lex () const
bool	prepare (select_result *result)
bool	push_extra (Extra_tag tag)
bool	push_extra (Extra_tag tag, const String &arg)
bool	push_extra (Extra_tag tag, const char *arg)
virtual bool	explain_id ()
virtual bool	explain_select_type ()
virtual bool	explain_table_name ()
virtual bool	explain_partitions ()
virtual bool	explain_join_type ()
virtual bool	explain_possible_keys ()
virtual bool	explain_key_and_len ()
virtual bool	explain_ref ()
virtual bool	explain_modify_flags ()

Additional Inherited Members
Protected Attributes inherited from Explain
THD *const	thd
	cached THD pointer
const CHARSET_INFO *const	cs
	cached pointer to system_charset_info
JOIN *const	join
	top-level JOIN (if any) provided by caller
select_result *const	external_result
	stream (if any) provided by caller
Explain_format *const	fmt
	shortcut for thd->lex->explain_format
Explain_context_enum	context_type
	associated value for struct. explain
JOIN::ORDER_with_src	order_list
JOIN::ORDER_with_src	group_list

Detailed Description

Explain_no_table class outputs a trivial EXPLAIN row with "extra" column

This class is intended for simple cases to produce EXPLAIN output with "No tables used", "No matching records" etc. Optionally it can output number of estimated rows in the "row" column.

Note

This class also produces EXPLAIN rows for inner units (if any).

Definition at line 240 of file opt_explain.cc.

Member Function Documentation

bool Explain_no_table::explain_rows_and_filtered ( )

protectedvirtual

fill col_rows and col_filtered fields together

Reimplemented from Explain.

Definition at line 766 of file opt_explain.cc.

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bool Explain_no_table::shallow_explain ( )

protectedvirtual

Explain everything but subqueries

Reimplemented from Explain.

Definition at line 757 of file opt_explain.cc.

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

• sql/opt_explain.cc