#include <parse_tree_nodes.h>

Inheritance diagram for PT_query_specification:

Public Member Functions
	PT_query_specification (PT_hint_list opt_hints_arg, const Query_options &options_arg, PT_item_list item_list_arg, PT_into_destination opt_into1_arg, const Mem_root_array_YY< PT_table_reference > &from_clause_arg, Item opt_where_clause_arg, PT_group opt_group_clause_arg, Item opt_having_clause_arg, PT_window_list opt_window_clause_arg, bool implicit_from_clause)

	PT_query_specification (const Query_options &options_arg, PT_item_list item_list_arg, const Mem_root_array_YY< PT_table_reference > &from_clause_arg, Item *opt_where_clause_arg)

	PT_query_specification (const Query_options &options_arg, PT_item_list *item_list_arg)

bool	contextualize (Parse_context *pc) override

bool	has_into_clause () const override

bool	has_trailing_into_clause () const override

bool	is_set_operation () const override

bool	can_absorb_order_and_limit (bool, bool) const override
	True if this query expression can absorb an extraneous order by/limit clause. More...

bool	is_table_value_constructor () const override

PT_insert_values_list *	get_row_value_list () const override

Public Member Functions inherited from Parse_tree_node_tmpl< Context >
virtual	~Parse_tree_node_tmpl ()=default

bool	is_contextualized () const

virtual bool	contextualize (Context *pc)
	Do all context-sensitive things and mark the node as contextualized. More...

void	error (Context *pc, const POS &pos) const
	syntax_error() function replacement for deferred reporting of syntax errors More...

void	error (Context pc, const POS &pos, const char msg) const
	syntax_error() function replacement for deferred reporting of syntax errors More...

void	errorf (Context pc, const POS &pos, const char format,...) const
	syntax_error() function replacement for deferred reporting of syntax errors More...

Private Types
typedef PT_query_primary	super

Private Member Functions
bool	is_implicit_from_clause () const

Private Attributes
PT_hint_list *	opt_hints

Query_options	options

PT_item_list *	item_list

PT_into_destination *	opt_into1

const bool	m_is_from_clause_implicit

Mem_root_array_YY< PT_table_reference * >	from_clause

Item *	opt_where_clause

PT_group *	opt_group_clause

Item *	opt_having_clause

PT_window_list *	opt_window_clause

Additional Inherited Members
Public Types inherited from Parse_tree_node_tmpl< Context >
typedef Context	context_t

Static Public Member Functions inherited from Parse_tree_node_tmpl< Context >
static void *	operator new (size_t size, MEM_ROOT *mem_root, const std::nothrow_t &arg=std::nothrow) noexcept

static void	operator delete (void *ptr, size_t size)

static void	operator delete (void , MEM_ROOT , const std::nothrow_t &) noexcept

Protected Member Functions inherited from Parse_tree_node_tmpl< Context >
	Parse_tree_node_tmpl ()

Member Typedef Documentation

◆ super

typedef PT_query_primary PT_query_specification::super

private

Constructor & Destructor Documentation

◆ PT_query_specification() [1/3]

PT_query_specification::PT_query_specification	(	PT_hint_list *	opt_hints_arg,
		const Query_options &	options_arg,
		PT_item_list *	item_list_arg,
		PT_into_destination *	opt_into1_arg,
		const Mem_root_array_YY< PT_table_reference * > &	from_clause_arg,
		Item *	opt_where_clause_arg,
		PT_group *	opt_group_clause_arg,
		Item *	opt_having_clause_arg,
		PT_window_list *	opt_window_clause_arg,
		bool	implicit_from_clause
	)

inline

◆ PT_query_specification() [2/3]

PT_query_specification::PT_query_specification	(	const Query_options &	options_arg,
		PT_item_list *	item_list_arg,
		const Mem_root_array_YY< PT_table_reference * > &	from_clause_arg,
		Item *	opt_where_clause_arg
	)

inline

◆ PT_query_specification() [3/3]

PT_query_specification::PT_query_specification	(	const Query_options &	options_arg,
		PT_item_list *	item_list_arg
	)

inline

Member Function Documentation

◆ can_absorb_order_and_limit()

bool PT_query_specification::can_absorb_order_and_limit	(	bool	order,
		bool	limit
	)		const

inlineoverridevirtual

True if this query expression can absorb an extraneous order by/limit clause.

The ORDER BY/LIMIT syntax is mostly consistestent, i.e. a trailing clause may not refer to the tables in the <query primary>, with one glaring exception:

(...( SELECT ... )...) ORDER BY ...

If the nested query expression doesn't contain ORDER BY, the statement is interpreted as if the ORDER BY was absorbed by the innermost query expression, i.e.:

(...( SELECT ... ORDER BY ... )...)

There is no rewriting of the parse tree nor AST happening here, the transformation is done by the contextualizer (see PT_query_expression::contextualize_order_and_limit), which interprets the parse tree, and builds the AST according to this interpretation. This interpretation is governed by the following rule: An ORDER BY can be absorbed if none the nested query expressions contains an ORDER BY or LIMIT. The rule is complex, so here are some examples for illustration:

In these cases the ORDER BY is absorbed:

( SELECT * FROM t1 ) ORDER BY t1.a;
(( SELECT * FROM t1 )) ORDER BY t1.a;

In these cases the ORDER BY is not absorbed:

( SELECT * FROM t1 ORDER BY 1 ) ORDER BY t1.a;
(( SELECT * FROM t1 ) ORDER BY 1 ) ORDER BY t1.a;
( SELECT * FROM t1 LIMIT 1 ) ORDER BY t1.a;
(( SELECT * FROM t1 ) LIMIT 1 ) ORDER BY t1.a;

The same happens with LIMIT, obviously, but the optimizer is freeer to choose when to apply the limit, and there are name no resolution issues involved.

Parameters

order	True if the outer query block has the ORDER BY clause.
limit	True if the outer query block has the LIMIT clause.

Implements PT_query_expression_body.

◆ contextualize()

bool PT_query_specification::contextualize ( Parse_context * pc )

override

◆ get_row_value_list()

PT_insert_values_list * PT_query_specification::get_row_value_list ( ) const

inlineoverridevirtual

Implements PT_query_expression_body.

◆ has_into_clause()

bool PT_query_specification::has_into_clause ( ) const

inlineoverridevirtual

Implements PT_query_expression_body.

◆ has_trailing_into_clause()

bool PT_query_specification::has_trailing_into_clause ( ) const

inlineoverridevirtual

Implements PT_query_expression_body.

◆ is_implicit_from_clause()

bool PT_query_specification::is_implicit_from_clause ( ) const

inlineprivate

◆ is_set_operation()

bool PT_query_specification::is_set_operation ( ) const

inlineoverridevirtual

Implements PT_query_expression_body.

◆ is_table_value_constructor()

bool PT_query_specification::is_table_value_constructor ( ) const

inlineoverridevirtual

Implements PT_query_expression_body.

Member Data Documentation

◆ from_clause

Mem_root_array_YY<PT_table_reference *> PT_query_specification::from_clause

private

◆ item_list

PT_item_list* PT_query_specification::item_list

private

◆ m_is_from_clause_implicit

const bool PT_query_specification::m_is_from_clause_implicit

private

◆ opt_group_clause

PT_group* PT_query_specification::opt_group_clause

private

◆ opt_having_clause

Item* PT_query_specification::opt_having_clause

private

◆ opt_hints

PT_hint_list* PT_query_specification::opt_hints

private

◆ opt_into1

PT_into_destination* PT_query_specification::opt_into1

private

◆ opt_where_clause

Item* PT_query_specification::opt_where_clause

private

◆ opt_window_clause

PT_window_list* PT_query_specification::opt_window_clause

private

◆ options

Query_options PT_query_specification::options

private

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

sql/parse_tree_nodes.h
sql/parse_tree_nodes.cc

Public Member Functions

Private Types

Private Member Functions

Private Attributes

Additional Inherited Members

Member Typedef Documentation

◆ super

Constructor & Destructor Documentation

◆ PT_query_specification() [1/3]

◆ PT_query_specification() [2/3]

◆ PT_query_specification() [3/3]

Member Function Documentation

◆ can_absorb_order_and_limit()

◆ contextualize()

◆ get_row_value_list()

◆ has_into_clause()

◆ has_trailing_into_clause()

◆ is_implicit_from_clause()

◆ is_set_operation()

◆ is_table_value_constructor()

Member Data Documentation

◆ from_clause

◆ item_list

◆ m_is_from_clause_implicit

◆ opt_group_clause

◆ opt_having_clause

◆ opt_hints

◆ opt_into1

◆ opt_where_clause

◆ opt_window_clause

◆ options