PT_group Class Reference

#include <parse_tree_nodes.h>

Inheritance diagram for PT_group:

Public Member Functions
	PT_group (const POS &pos, Mem_root_array_YY< PT_order_list * > group_list_arg, olap_type olap_arg)
bool	do_contextualize (Parse_context *pc) override
bool	set_olap_type (Parse_context *pc)
bool	set_num_grouping_sets (Parse_context *pc, int &num_grouping_sets)
void	check_if_execute_only_in_secondary_engine (Parse_context *pc, int num_grouping_sets)
bool	allocate_grouping_sets (Parse_context *pc, int &num_grouping_sets)
	Initializes the grouping set if the query block includes GROUP BY modifiers. More...
bool	populate_grouping_sets (Parse_context *pc)
	Populates the grouping sets if the query block includes non-primitive grouping. More...
void	populate_grouping_sets_rollup_cube (Parse_context *pc)
	Populate the grouping set bitvector if the query block has non-primitive ROLLUP and CUBE grouping. More...
bool	populate_grouping_sets_fornon_primitive_grouping (Parse_context *pc)
	Populate the grouping set bitvector if the query block has GROUPING SETS group by modifier. More...
Public Member Functions inherited from Parse_tree_node_tmpl< Context >
virtual	~Parse_tree_node_tmpl ()=default
bool	is_contextualized () const
void	set_contextualized ()
virtual bool	contextualize (Context *pc) final
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...

Protected Member Functions
void	add_json_info (Json_object *obj) override
	Add all the node-specific json fields. More...
Protected Member Functions inherited from Parse_tree_node_tmpl< Context >
	Parse_tree_node_tmpl ()=delete
	Parse_tree_node_tmpl (const POS &pos)
	Parse_tree_node_tmpl (const POS &start_pos, const POS &end_pos)
bool	begin_parse_tree (Show_parse_tree *tree)
bool	end_parse_tree (Show_parse_tree *tree)
virtual bool	do_contextualize (Context *pc)
	Do all context-sensitive things and mark the node as contextualized. More...

Private Types
typedef Parse_tree_node	super

Private Attributes
Mem_root_array_YY< PT_order_list * >	group_list
olap_type	olap

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
Public Attributes inherited from Parse_tree_node_tmpl< Context >
POS	m_pos

Member Typedef Documentation

super

typedef Parse_tree_node PT_group::super

private

Constructor & Destructor Documentation

PT_group()

PT_group::PT_group ( const POS &  pos, Mem_root_array_YY< PT_order_list * >  group_list_arg, olap_type  olap_arg  )

inline

Member Function Documentation

add_json_info()

void PT_group::add_json_info ( Json_object *  json_obj )

inlineoverrideprotectedvirtual

Add all the node-specific json fields.

Any class that needs to add such info should override this function rather than doing it in do_contextualize(). E.g. the parse tree node for AVG() may have "distinct" field to indicate if AVG(DISTINCT ...) is used or not.

Parameters

json_obj

Json object for this parse tree node.

Reimplemented from Parse_tree_node_tmpl< Context >.

allocate_grouping_sets()

bool PT_group::allocate_grouping_sets	(	Parse_context *	pc,
		int &	num_grouping_sets
	)

Initializes the grouping set if the query block includes GROUP BY modifiers.

check_if_execute_only_in_secondary_engine()

void PT_group::check_if_execute_only_in_secondary_engine	(	Parse_context *	pc,
		int	num_grouping_sets
	)

do_contextualize()

bool PT_group::do_contextualize ( Parse_context *  pc )

override

populate_grouping_sets()

bool PT_group::populate_grouping_sets

(

Parse_context *

pc

)

Populates the grouping sets if the query block includes non-primitive grouping.

Populate the grouping set bitvector if the query block has non-primitive grouping.

Group by modifiers ROLLUP, CUBE and GROUPING SETS can be represented as grouping sets, which are determined during query preparation. The representation of the grouping set is done using a bitfield in the ORDER object. case ROLLUP : Say the query has GROUP BY ROLLUP (c1,c2) then the grouping sets will be () (c1) (c1,c2). () represents implicit grouping. Here there are 3 grouping sets ranging from 0 to 2. where 0 is the implicit grouping. The bitfield associated with Group by element 'c1' will be 6 (i,e. (2^2)+(2^1)) The bitfield associated with Group by element 'c2' will be 4 (i,e. (2^2)) as it is part of only set number 2

case CUBE: Say the query has GROUP BY CUBE (c1,c2) then the grouping sets will be () (c2) (c1) (c1,c2) The bitfield associated with Group by element 'c1' will be 12 (i,e. (2^3)+(2^2)). The bitfield associated with Group by element 'c2' will be 10 (i,e. (2^3)+(2^1)).

case GROUPING SETS: Say the query has GROUP BY GROUPING SETS ((c1), (c1,c2), (), (c2)) then the grouping sets will be (c1), (c1,c2), (), (c2) The number of grouping sets will be 4. The bitfield associated with Group by element 'c1' will be 3 (i,e. (2^0)+(2^1)). The bitfield associated with Group by element 'c2' will be 10 (i,e. (2^3)+(2^1)).

populate_grouping_sets_fornon_primitive_grouping()

bool PT_group::populate_grouping_sets_fornon_primitive_grouping

(

Parse_context *

pc

)

Populate the grouping set bitvector if the query block has GROUPING SETS group by modifier.

Populate the grouping set bitvector if the query block has non-primitive GROUPING SETS.

populate_grouping_sets_rollup_cube()

void PT_group::populate_grouping_sets_rollup_cube

(

Parse_context *

pc

)

Populate the grouping set bitvector if the query block has non-primitive ROLLUP and CUBE grouping.

set_num_grouping_sets()

bool PT_group::set_num_grouping_sets	(	Parse_context *	pc,
		int &	num_grouping_sets
	)

set_olap_type()

bool PT_group::set_olap_type

(

Parse_context *

pc

)

Member Data Documentation

group_list

Mem_root_array_YY<PT_order_list *> PT_group::group_list

private

olap

olap_type PT_group::olap

private

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

• sql/parse_tree_nodes.h
• sql/parse_tree_nodes.cc