MySQL 8.0.29
Source Code Documentation
Query_result_scalar_subquery Class Reference
Inheritance diagram for Query_result_scalar_subquery:

Public Member Functions

 Query_result_scalar_subquery (Item_subselect *item_arg)
bool send_data (THD *thd, const mem_root_deque< Item * > &items) override
- Public Member Functions inherited from Query_result_subquery
 Query_result_subquery (Item_subselect *item_arg)
bool send_eof (THD *) override
- Public Member Functions inherited from Query_result_interceptor
 Query_result_interceptor ()
uint field_count (const mem_root_deque< Item * > &) const override
bool send_result_set_metadata (THD *, const mem_root_deque< Item * > &, uint) override
bool is_interceptor () const final
 Checks if this Query_result intercepts and transforms the result set. More...
- Public Member Functions inherited from Query_result
 Query_result ()
virtual ~Query_result ()=default
virtual bool needs_file_privilege () const
virtual bool change_query_result (THD *, Query_result *)
 Change wrapped Query_result. More...
virtual bool need_explain_interceptor () const
virtual bool prepare (THD *, const mem_root_deque< Item * > &, Query_expression *u)
 Perform preparation specific to the query expression or DML statement. More...
virtual bool optimize ()
 Optimize the result processing of a query expression, applicable to data change operation (not simple select queries). More...
virtual bool start_execution (THD *)
 Prepare for execution of the query expression or DML statement. More...
virtual bool create_table_for_query_block (THD *)
 Create table, only needed to support CREATE TABLE ... SELECT. More...
virtual void send_error (THD *, uint errcode, const char *err)
virtual bool check_simple_query_block () const
 Check if this query returns a result set and therefore is allowed in cursors and set an error message if it is not the case. More...
virtual void abort_result_set (THD *)
virtual bool reset ()
 Cleanup after one execution of the unit, to be ready for a next execution inside the same statement. More...
virtual void cleanup (THD *)
 Cleanup after this execution. More...
void begin_dataset ()
virtual const ha_rowsrow_count () const
virtual bool immediate_update (TABLE_LIST *t) const
 If this Query_result performs modifications to tables: tells if it modifies the given table's row as it's read (a.k.a. More...

Additional Inherited Members

- Public Attributes inherited from Query_result
ha_rows estimated_rowcount
 Number of records estimated in this result. More...
double estimated_cost
 Cost to execute the subquery which produces this result. More...
- Protected Attributes inherited from Query_result_subquery
- Protected Attributes inherited from Query_result

Constructor & Destructor Documentation

◆ Query_result_scalar_subquery()

Query_result_scalar_subquery::Query_result_scalar_subquery ( Item_subselect item_arg)

Member Function Documentation

◆ send_data()

bool Query_result_scalar_subquery::send_data ( THD thd,
const mem_root_deque< Item * > &  items 

Implements Query_result_subquery.

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