Query_term_except Class Reference

Node type for n-ary EXCEPT. More...

#include <query_term.h>

Inheritance diagram for Query_term_except:

Public Member Functions
	Query_term_except (MEM_ROOT *mem_root)
	Constructor. More...
Query_term_type	term_type () const override
	Get the node tree type. More...
const char *	operator_string () const override
	Get the node type description. More...
void	debugPrint (int level, std::ostringstream &buf) const override
	Print the tree rooted at this node to buf. More...
Public Member Functions inherited from Query_term_set_op
mem_root_deque< Item * > *	types_array () override
Query_term *	child (size_t idx) const
	Get child at given index. More...
int64_t	last_distinct () const
	Getter for m_last_distinct, q.v. More...
int64_t	first_distinct () const
	Getter for m_first_distinct, q.v. More...
bool	is_materialized () const
	Getter for m_is_materialized, q.v. More...
void	set_is_materialized (bool mat)
	Setter for m_is_materialized, q.v. More...
Query_block *	query_block () const override
	Getter for m_block, q.v. More...
bool	set_block (Query_block *b)
	Setter for m_block, q.v. More...
void	label_children () override
	Set the correct value of Query_term::m_sibling_idx recursively for set operations. More...
size_t	child_count () const override
	Get the number of children this node has. More...
bool	open_result_tables (THD *thd, int level) override
	Open tmp tables for the tree of set operation query results, by recursing. More...
void	cleanup (bool full) override
	Reset resources used. More...
void	destroy_tree () override
	Destroy the query term tree structure. More...
bool	has_mixed_distinct_operators ()
	Check if this set operation has a mix of DISTINCT and ALL. More...
bool	is_unary () const
	Check if this term is a unary set operation. More...
Mem_root_array< MaterializePathParameters::Operand >	setup_materialize_set_op (THD *thd, TABLE *dst_table, bool union_distinct_only, bool calc_found_rows)
	Sets up each(*) query block in this query expression for materialization into the given table by making a materialization parameter for each block (*) modulo union_distinct_only. More...
bool	prepare_query_term (THD *thd, Query_expression *qe, Change_current_query_block *save_query_block, mem_root_deque< Item * > *insert_field_list, Query_result *common_result, ulonglong added_options, ulonglong removed_options, ulonglong create_option) override
	a) Prepare query blocks, both leaf blocks and blocks reresenting order by/limit in query primaries with parentesized query expression body with order by clause and/or limit/offset clause (unary query terms). More...
bool	optimize_query_term (THD *thd, Query_expression *qe) override
	Optimize the non-leaf query blocks. More...
AccessPath *	make_set_op_access_path (THD *thd, Query_term_set_op *parent, Mem_root_array< AppendPathParameters > *union_all_subpaths, bool calc_found_rows) override
	Recursively constructs the access path of the set operation, possibly materializing in a tmp table if needed, cf. More...
VisibleFieldsIterator	types_iterator () override
	Abstract over visible column types: if query block, we offer an iterator over visible fields, for binary set operators we offer an iterator over m_types, for unary we just call the child's. More...
size_t	visible_column_count () const override
	Return the number of visible columns of the query term. More...
bool	in_right_side_in_except_or_intersect (Query_term *qt)
Public Member Functions inherited from Query_term
Query_term *	pushdown_limit_order_by (Query_term_set_op *parent=nullptr)
	Called after contextualization to simplify query, c.f. More...
bool	validate_structure (const Query_term *parent, int depth=0) const
	Return true if structure is too deep, i.e. More...
std::pair< bool, bool >	redundant_order_by (Query_block *block, int level)
	Determine if we have a redundant ORDER BY in block. More...
virtual	~Query_term ()=default
	Node destructor. More...
bool	create_tmp_table (THD *thd, ulonglong create_options)
	Create a temporary table for a set operation. More...
Query_term_set_op *	parent () const
	Getter for m_parent, q.v. More...
void	set_sibling_idx (uint idx)
	Setter for m_sibling_idx, q.v. More...
uint	sibling_idx ()
	Getter for m_sibling_idx, q.v. More...
void	printPointers (std::ostringstream &buf) const
	Print the pointer of this node and its parent to buf. More...
void	set_setop_query_result (Query_result *rs)
	Setter for m_setop_query_result, q.v. More...
Query_result *	setop_query_result ()
	Getter for m_setop_query_result, q.v. More...
Query_result_union *	setop_query_result_union ()
	Getter for m_setop_query_result, q.v. Use only if we can down cast. More...
void	cleanup_query_result (bool full)
	Cleanup m_setop_query_result, q.v. More...
void	set_owning_operand ()
	Setter for m_owning_operand, q.v. More...
bool	owning_operand ()
	Getter for m_owning_operand, q.v. More...
void	set_result_table (Table_ref *tl)
	Setter for m_result_table, q.v. More...
Table_ref &	result_table ()
	Getter for m_result_table, q.v. More...
void	set_fields (mem_root_deque< Item * > *fields)
mem_root_deque< Item * > *	fields ()

Additional Inherited Members
Static Public Member Functions inherited from Query_term
static void	indent (int level, std::ostringstream &buf)
	Print blank space indentation (unit: two) to buf according to level. More...
static void	print_order (const THD *thd, String *str, ORDER *ord, enum_query_type query_type)
	Print into str the order indicated in ord, using standard print_for_order Used by traditional explain. More...
Protected Member Functions inherited from Query_term_set_op
	Query_term_set_op (MEM_ROOT *mem_root)
void	print (int level, std::ostringstream &buf, const char *type) const
	Common printing minion for set operations. More...
bool	check_joined_types ()
	On top level, check that it was possible to aggregate all collations together for set operation. More...
Protected Attributes inherited from Query_term_set_op
mem_root_deque< Query_term * >	m_children
	Tree structure. More...
bool	m_is_materialized {true}
	true if the result of this set operation is materialized. More...
int64_t	m_last_distinct {0}
	Index of last query expression which has <set-op> DISTINCT on its left. More...
int64_t	m_first_distinct {0}
	Presently only needed by EXCEPT set operator: the index of the first DISTINCT set operand: minimum legal value is 1. More...
Protected Attributes inherited from Query_term
Query_term_set_op *	m_parent {nullptr}
	Back pointer to the node whose child we are, or nullptr (root term). More...
uint	m_sibling_idx {0}
	If parent is non-null, this holds the index of the current sibling. More...
Query_result *	m_setop_query_result {nullptr}
	The query result for this term. More...
bool	m_owning_operand {false}
	The operand of a n-ary set operation (that owns the common query result) has this set to true. More...
Table_ref *	m_result_table {nullptr}
	Result temporary table for the set operation, if applicable. More...
mem_root_deque< Item * > *	m_fields {nullptr}
	Used only when streaming, i.e. More...

Detailed Description

Node type for n-ary EXCEPT.

Constructor & Destructor Documentation

Query_term_except()

Query_term_except::Query_term_except ( MEM_ROOT *  mem_root )

inline

Constructor.

Parameters

mem_root

the mem_root to use for allocation

Member Function Documentation

debugPrint()

void Query_term_except::debugPrint ( int  level, std::ostringstream &  buf  ) const

overridevirtual

Print the tree rooted at this node to buf.

Call on top level with level==0

Parameters

level	level we are at in tree.
buf	the buffer to format output into

Implements Query_term.

operator_string()

const char * Query_term_except::operator_string ( ) const

inlineoverridevirtual

Get the node type description.

Returns

descriptive string for each node type.

Implements Query_term.

term_type()

Query_term_type Query_term_except::term_type ( ) const

inlineoverridevirtual

Get the node tree type.

Returns

the tree node type

Implements Query_term.

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

• sql/query_term.h
• sql/query_term.cc