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MySQL 8.4.3
Source Code Documentation
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MySQL 8.4.3
Source Code Documentation
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#include <item.h>
Public Member Functions | |
| Item_insert_value (const POS &pos, Item *a) | |
| Constructs an Item_insert_value that represents a call to the deprecated VALUES function. More... | |
| Item_insert_value (Name_resolution_context *context_arg, Item *a) | |
| Constructs an Item_insert_value that represents a derived table that wraps a table value constructor. More... | |
| bool | do_itemize (Parse_context *pc, Item **res) override |
| The core function that does the actual itemization. More... | |
| enum Type | type () const override |
| bool | eq (const Item *item, bool binary_cmp) const override |
| bool | fix_fields (THD *, Item **) override |
| Resolve the name of a column reference. More... | |
| void | bind_fields () override |
| Bind objects from the current execution context to field objects in item trees. More... | |
| void | cleanup () override |
| Called for every Item after use (preparation and execution). More... | |
| void | print (const THD *thd, String *str, enum_query_type query_type) const override |
| This method is used for to: More... | |
| table_map | used_tables () const override |
| bool | walk (Item_processor processor, enum_walk walk, uchar *args) override |
| Traverses a tree of Items in prefix and/or postfix order. More... | |
| bool | check_function_as_value_generator (uchar *args) override |
| Check if this item is allowed for a virtual column or inside a default expression. More... | |
 Public Member Functions inherited from Item_field | |
| Item_equal * | multi_equality () const |
| void | set_item_equal_all_join_nests (Item_equal *item_equal) |
| Item_field (Name_resolution_context *context_arg, const char *db_arg, const char *table_name_arg, const char *field_name_arg) | |
| Constructor used for internal information queries. More... | |
| Item_field (const POS &pos, const char *db_arg, const char *table_name_arg, const char *field_name_arg) | |
| Used from parser to construct column references. More... | |
| Item_field (THD *thd, Item_field *item) | |
| Used to create a copy (clone) of another Item_field. More... | |
| Item_field (THD *thd, Name_resolution_context *context_arg, Table_ref *tr, Field *field) | |
| Constructor used inside setup_wild(). More... | |
| Item_field (Field *field) | |
| Create column reference based on a table field. More... | |
| double | val_real () override |
| longlong | val_int () override |
| longlong | val_time_temporal () override |
| Return time value of item in packed longlong format. More... | |
| longlong | val_date_temporal () override |
| Return date value of item in packed longlong format. More... | |
| longlong | val_time_temporal_at_utc () override |
| longlong | val_date_temporal_at_utc () override |
| my_decimal * | val_decimal (my_decimal *) override |
| String * | val_str (String *) override |
| bool | val_json (Json_wrapper *result) override |
| Get a JSON value from an Item. More... | |
| bool | send (Protocol *protocol, String *str_arg) override |
| This is only called from items that is not of type item_field. More... | |
| void | reset_field (Field *f) |
| Reset this item to point to a field from the new temporary table. More... | |
| void | make_field (Send_field *tmp_field) override |
| void | save_org_in_field (Field *field) override |
| Set a field's value from a item. More... | |
| Item_result | result_type () const override |
| Item_result | numeric_context_result_type () const override |
| Result type when an item appear in a numeric context. More... | |
| TYPELIB * | get_typelib () const override |
| Get the typelib information for an item of type set or enum. More... | |
| Item_result | cast_to_int_type () const override |
| enum_monotonicity_info | get_monotonicity_info () const override |
| longlong | val_int_endpoint (bool left_endp, bool *incl_endp) override |
| void | set_result_field (Field *field_arg) override |
| Field * | get_tmp_table_field () override |
| If this Item is being materialized into a temporary table, returns the field that is being materialized into. More... | |
| Field * | tmp_table_field (TABLE *) override |
| void | set_base_item_field (const Item_field *item) |
| const Item_field * | base_item_field () const |
| bool | get_date (MYSQL_TIME *ltime, my_time_flags_t fuzzydate) override |
| bool | get_time (MYSQL_TIME *ltime) override |
| bool | get_timeval (my_timeval *tm, int *warnings) override |
| Get timestamp in "struct timeval" format. More... | |
| bool | is_null () override |
| The method allows to determine nullness of a complex expression without fully evaluating it, instead of calling val*() then checking null_value. More... | |
| Item * | get_tmp_table_item (THD *thd) override |
| If an Item is materialized in a temporary table, a different Item may have to be used in the part of the query that runs after the materialization. More... | |
| bool | collect_item_field_processor (uchar *arg) override |
| Store the pointer to this item field into a list if not already there. More... | |
| bool | collect_item_field_or_ref_processor (uchar *arg) override |
| When collecting information about columns when transforming correlated scalar subqueries using derived tables, we need to decide which duplicates, if any, to retain: More... | |
| bool | collect_item_field_or_view_ref_processor (uchar *arg) override |
| Collects fields and view references that have the qualifying table in the specified query block. More... | |
| bool | add_field_to_set_processor (uchar *arg) override |
| Item::walk function. More... | |
| bool | add_field_to_cond_set_processor (uchar *) override |
| Item::walk function. More... | |
| bool | remove_column_from_bitmap (uchar *arg) override |
| Visitor interface for removing all column expressions (Item_field) in this expression tree from a bitmap. More... | |
| bool | find_item_in_field_list_processor (uchar *arg) override |
| Check if an Item_field references some field from a list of fields. More... | |
| bool | find_field_processor (uchar *arg) override |
| Is this an Item_field which references the given Field argument? More... | |
| bool | mark_field_in_map (uchar *arg) override |
| Mark underlying field in read or write map of a table. More... | |
| bool | used_tables_for_level (uchar *arg) override |
| Return used table information for the specified query block (level). More... | |
| bool | check_column_privileges (uchar *arg) override |
| Check privileges of base table column. More... | |
| bool | check_partition_func_processor (uchar *) override |
| Check if a partition function is allowed. More... | |
| bool | is_valid_for_pushdown (uchar *arg) override |
| Check if all the columns present in this expression are from the derived table. More... | |
| bool | check_column_in_window_functions (uchar *arg) override |
| Check if this column is found in PARTITION clause of all the window functions. More... | |
| bool | check_column_in_group_by (uchar *arg) override |
| Check if this column is found in GROUP BY. More... | |
| Item * | replace_with_derived_expr (uchar *arg) override |
| Assuming this expression is part of a condition that would be pushed to the WHERE clause of a materialized derived table, replace, in this expression, each derived table's column with a clone of the expression lying under it in the derived table's definition. More... | |
| Item * | replace_with_derived_expr_ref (uchar *arg) override |
| Assuming this expression is part of a condition that would be pushed to the HAVING clause of a materialized derived table, replace, in this expression, each derived table's column with a reference to the expression lying under it in the derived table's definition. More... | |
| void | reset_field () |
| Reset all aspect of a field object, so that it can be re-resolved. More... | |
| Item_equal * | find_item_equal (COND_EQUAL *cond_equal) const |
| Find a field among specified multiple equalities. More... | |
| bool | subst_argument_checker (uchar **arg) override |
| Check whether a field can be substituted by an equal item. More... | |
| Item * | equal_fields_propagator (uchar *arg) override |
| If field matches a multiple equality, set a pointer to that object in the field. More... | |
| Item * | replace_item_field (uchar *) override |
| If this field is the target is the target of replacement, replace it with the info object's item or, if the item is found inside a subquery, the target is an outer reference, so we create a new Item_field, mark it accordingly and replace with that instead. More... | |
| bool | disable_constant_propagation (uchar *) override |
| Item * | replace_equal_field (uchar *) override |
| Replace an Item_field for an equal Item_field that evaluated earlier (if any). More... | |
| uint32 | max_disp_length () |
| Item_field * | field_for_view_update () override |
| Item * | safe_charset_converter (THD *thd, const CHARSET_INFO *tocs) override |
| int | fix_outer_field (THD *thd, Field **field, Item **reference) |
| Resolve the name of an outer select column reference. More... | |
| Item * | update_value_transformer (uchar *select_arg) override |
| Add the field to the select list and substitute it for the reference to the field. More... | |
| bool | is_outer_field () const override |
| Field::geometry_type | get_geometry_type () const override |
| const CHARSET_INFO * | charset_for_protocol (void) override |
| void | dbug_print () const |
| float | get_filtering_effect (THD *thd, table_map filter_for_table, table_map read_tables, const MY_BITMAP *fields_to_ignore, double rows_in_table) override |
| Calculate condition filtering effect for "WHERE field", which implicitly means "WHERE field <> 0". More... | |
| float | get_cond_filter_default_probability (double max_distinct_values, float default_filter) const |
| Returns the probability for the predicate "col OP <val>" to be true for a row in the case where no index statistics or range estimates are available for 'col'. More... | |
| bool | alias_name_used () const override |
| bool | repoint_const_outer_ref (uchar *arg) override |
| If this object is the real_item of an Item_ref, repoint the result_field to field. More... | |
| bool | returns_array () const override |
| Whether the item returns array of its data type. More... | |
| void | set_can_use_prefix_key () override |
| bool | replace_field_processor (uchar *arg) override |
| A processor that replaces any Fields with a Create_field_wrapper. More... | |
| bool | strip_db_table_name_processor (uchar *) override |
| Generated fields don't need db/table names. More... | |
| virtual bool | is_asterisk () const |
| Checks if the current object represents an asterisk select list item. More... | |
| bool | protected_by_any_value () const |
See m_protected_by_any_value. More... | |
| void | compute_cost (CostOfItem *root_cost) const override |
| Compute the cost of evaluating this Item. More... | |
| Public Member Functions inherited from Item_ident | |
| Item_ident (Name_resolution_context *context_arg, const char *db_name_arg, const char *table_name_arg, const char *field_name_arg) | |
| Item_ident (const POS &pos, const char *db_name_arg, const char *table_name_arg, const char *field_name_arg) | |
| Item_ident (THD *thd, Item_ident *item) | |
| Constructor used by Item_field & Item_*_ref (see Item comment) More... | |
| const char * | full_name () const override |
| void | set_orignal_db_name (const char *name_arg) |
| void | set_original_table_name (const char *name_arg) |
| void | set_original_field_name (const char *name_arg) |
| const char * | original_db_name () const |
| const char * | original_table_name () const |
| const char * | original_field_name () const |
| bool | aggregate_check_distinct (uchar *arg) override |
| bool | aggregate_check_group (uchar *arg) override |
| Bool3 | local_column (const Query_block *sl) const override |
| Tells if this is a column of a table whose qualifying query block is 'sl'. More... | |
| bool | change_context_processor (uchar *arg) override |
| bool | is_alias_of_expr () const |
| void | set_alias_of_expr () |
| Marks that this Item's name is alias of SELECT expression. More... | |
| bool | update_depended_from (uchar *) override |
| bool | is_strong_side_column_not_in_fd (uchar *arg) override |
| bool | is_column_not_in_fd (uchar *arg) override |
| Public Member Functions inherited from Item | |
| Item (const Item &)=delete | |
| void | operator= (Item &)=delete |
| Item () | |
| Item constructor for general use. More... | |
| Item (THD *thd, const Item *item) | |
| Constructor used by Item_field, Item_ref & aggregate functions. More... | |
| Item (const POS &) | |
| Parse-time context-independent constructor. More... | |
| ~Item () override=default | |
| virtual bool | itemize (Parse_context *pc, Item **res) final |
| The same as contextualize() but with additional parameter. More... | |
| void | rename (char *new_name) |
| rename item (used for views, cleanup() return original name). More... | |
| void | init_make_field (Send_field *tmp_field, enum enum_field_types type) |
| virtual void | notify_removal () |
| Called when an item has been removed, can be used to notify external objects about the removal, e.g subquery predicates that are part of the sj_candidates container. More... | |
| virtual Field * | make_string_field (TABLE *table) const |
| Create a field to hold a string value from an item. More... | |
| void | quick_fix_field () |
| virtual bool | propagate_type (THD *thd, const Type_properties &type) |
| Propagate data type specifications into parameters and user variables. More... | |
| bool | propagate_type (THD *thd, enum_field_types def=MYSQL_TYPE_VARCHAR, bool pin=false, bool inherit=false) |
| Wrapper for easier calling of propagate_type(const Type_properties &). More... | |
| virtual void | mark_json_as_scalar () |
| For Items with data type JSON, mark that a string argument is treated as a scalar JSON value. More... | |
| virtual std::optional< ContainedSubquery > | get_contained_subquery (const Query_block *outer_query_block) |
| If this item represents a IN/ALL/ANY/comparison_operator subquery, return that (along with data on how it will be executed). More... | |
| type_conversion_status | save_in_field_no_warnings (Field *field, bool no_conversions) |
| Save the item into a field but do not emit any warnings. More... | |
| type_conversion_status | save_in_field (Field *field, bool no_conversions) |
| Save a temporal value in packed longlong format into a Field. More... | |
| void | save_in_field_no_error_check (Field *field, bool no_conversions) |
| A slightly faster value of save_in_field() that returns no error value (you will need to check thd->is_error() yourself), and does not support saving into hidden fields for functional indexes. More... | |
| bool | evaluate (THD *thd, String *str) |
| Evaluate scalar item, possibly using the supplied buffer. More... | |
| Item_result | temporal_with_date_as_number_result_type () const |
| Similar to result_type() but makes DATE, DATETIME, TIMESTAMP pretend to be numbers rather than strings. More... | |
| virtual void | set_data_type_inherited () |
| Set data type for item as inherited. More... | |
| virtual void | pin_data_type () |
| Pin the data type for the item. More... | |
| enum_field_types | data_type () const |
| Retrieve the derived data type of the Item. More... | |
| virtual enum_field_types | actual_data_type () const |
| Retrieve actual data type for an item. More... | |
| virtual enum_field_types | default_data_type () const |
| Get the default data (output) type for the specific item. More... | |
| void | set_data_type (enum_field_types data_type) |
| Set the data type of the current Item. More... | |
| void | set_data_type_null () |
| void | set_data_type_bool () |
| void | set_data_type_int (enum_field_types type, bool unsigned_prop, uint32 max_width) |
| Set the data type of the Item to be a specific integer type. More... | |
| void | set_data_type_longlong () |
| Set the data type of the Item to be longlong. More... | |
| void | set_data_type_decimal (uint8 precision, uint8 scale) |
| Set the data type of the Item to be decimal. More... | |
| void | set_data_type_double () |
| Set the data type of the Item to be double precision floating point. More... | |
| void | set_data_type_float () |
| Set the data type of the Item to be single precision floating point. More... | |
| void | set_data_type_string (uint32 max_l) |
| Set the Item to be variable length string. More... | |
| void | set_data_type_string (ulonglong max_char_length_arg) |
| Set the Item to be variable length string. More... | |
| void | set_data_type_string (uint32 max_l, const CHARSET_INFO *cs) |
| Set the Item to be variable length string. More... | |
| void | set_data_type_string (uint32 max_l, const DTCollation &coll) |
| Set the Item to be variable length string. More... | |
| void | set_data_type_char (uint32 max_l) |
| Set the Item to be fixed length string. More... | |
| void | set_data_type_char (uint32 max_l, const CHARSET_INFO *cs) |
| Set the Item to be fixed length string. More... | |
| void | set_data_type_blob (enum_field_types type, uint32 max_l) |
| Set the Item to be of BLOB type. More... | |
| void | set_data_type_date () |
| Set all type properties for Item of DATE type. More... | |
| void | set_data_type_time (uint8 fsp) |
| Set all type properties for Item of TIME type. More... | |
| void | set_data_type_datetime (uint8 fsp) |
| Set all properties for Item of DATETIME type. More... | |
| void | set_data_type_timestamp (uint8 fsp) |
| Set all properties for Item of TIMESTAMP type. More... | |
| void | set_data_type_geometry () |
| Set the data type of the Item to be GEOMETRY. More... | |
| void | set_data_type_json () |
| Set the data type of the Item to be JSON. More... | |
| void | set_data_type_year () |
| Set the data type of the Item to be YEAR. More... | |
| void | set_data_type_bit (uint32 max_bits) |
| Set the data type of the Item to be bit. More... | |
| void | set_data_type_from_item (const Item *item) |
| Set data type properties of the item from the properties of another item. More... | |
| bool | aggregate_type (const char *name, Item **items, uint count) |
| Aggregates data types from array of items into current item. More... | |
| longlong | val_temporal_by_field_type () |
| Return date or time value of item in packed longlong format, depending on item field type. More... | |
| longlong | int_sort_key () |
| Produces a key suitable for filesort. More... | |
| longlong | val_temporal_with_round (enum_field_types type, uint8 dec) |
| Get date or time value in packed longlong format. More... | |
| ulonglong | val_uint () |
| virtual String * | val_str_ascii (String *str) |
| virtual bool | val_bool () |
| bool | error_json () |
| Get the value to return from val_json() in case of errors. More... | |
| bool | get_date_from_non_temporal (MYSQL_TIME *ltime, my_time_flags_t fuzzydate) |
| Convert a non-temporal type to date. More... | |
| bool | get_time_from_non_temporal (MYSQL_TIME *ltime) |
| Convert a non-temporal type to time. More... | |
| my_decimal * | error_decimal (my_decimal *decimal_value) |
| Get the value to return from val_decimal() in case of errors. More... | |
| String * | error_str () |
| Get the value to return from val_str() in case of errors. More... | |
| type_conversion_status | save_time_in_field (Field *field) |
| type_conversion_status | save_date_in_field (Field *field) |
| type_conversion_status | save_str_value_in_field (Field *field, String *result) |
| virtual table_map | not_null_tables () const |
| Return table map of tables that can't be NULL tables (tables that are used in a context where if they would contain a NULL row generated by a LEFT or RIGHT join, the item would not be true). More... | |
| virtual bool | basic_const_item () const |
| Returns true if this is a simple constant item like an integer, not a constant expression. More... | |
| bool | may_eval_const_item (const THD *thd) const |
| virtual Item * | clone_item () const |
| virtual cond_result | eq_cmp_result () const |
| uint | float_length (uint decimals_par) const |
| virtual uint | decimal_precision () const |
| int | decimal_int_part () const |
| virtual uint | time_precision () |
| TIME precision of the item: 0..6. More... | |
| virtual uint | datetime_precision () |
| DATETIME precision of the item: 0..6. More... | |
| bool | const_item () const |
| Returns true if item is constant, regardless of query evaluation state. More... | |
| bool | const_for_execution () const |
| Returns true if item is constant during one query execution. More... | |
| bool | may_evaluate_const (const THD *thd) const |
| Return true if this is a const item that may be evaluated in the current phase of statement processing. More... | |
| bool | is_non_deterministic () const |
| bool | is_outer_reference () const |
| void | print_item_w_name (const THD *thd, String *, enum_query_type query_type) const |
| void | print_for_order (const THD *thd, String *str, enum_query_type query_type, const char *used_alias) const |
| Prints the item when it's part of ORDER BY and GROUP BY. More... | |
| virtual void | update_used_tables () |
| Updates used tables, not null tables information and accumulates properties up the item tree, cf. More... | |
| virtual bool | split_sum_func (THD *, Ref_item_array, mem_root_deque< Item * > *) |
| bool | split_sum_func2 (THD *thd, Ref_item_array ref_item_array, mem_root_deque< Item * > *fields, Item **ref, bool skip_registered) |
| bool | update_null_value () |
| Make sure the null_value member has a correct value. More... | |
| virtual void | apply_is_true () |
| Apply the IS TRUE truth property, meaning that an UNKNOWN result and a FALSE result are treated the same. More... | |
| virtual bool | is_result_field () const |
| virtual Field * | get_result_field () const |
| virtual bool | is_bool_func () const |
| virtual void | no_rows_in_result () |
| virtual Item * | copy_or_same (THD *) |
| virtual Item * | copy_andor_structure (THD *) |
| virtual Item * | real_item () |
| virtual const Item * | real_item () const |
| virtual const CHARSET_INFO * | compare_collation () const |
| template<class T > | |
| auto | walk_helper_thunk (uchar *arg) |
| template<class T > | |
| auto | analyze_helper_thunk (uchar **arg) |
| See CompileItem. More... | |
| virtual Item * | transform (Item_transformer transformer, uchar *arg) |
| Perform a generic transformation of the Item tree, by adding zero or more additional Item objects to it. More... | |
| virtual Item * | compile (Item_analyzer analyzer, uchar **arg_p, Item_transformer transformer, uchar *arg_t) |
| Perform a generic "compilation" of the Item tree, ie transform the Item tree by adding zero or more Item objects to it. More... | |
| virtual void | traverse_cond (Cond_traverser traverser, void *arg, traverse_order) |
| virtual bool | intro_version (uchar *) |
| bool | cleanup_processor (uchar *) |
| cleanup() item if it is resolved ('fixed'). More... | |
| virtual bool | visitor_processor (uchar *arg) |
| A processor to handle the select lex visitor framework. More... | |
| virtual bool | find_item_processor (uchar *arg) |
| virtual bool | is_non_const_over_literals (uchar *) |
| virtual bool | cast_incompatible_args (uchar *) |
| Wrap incompatible arguments in CAST nodes to the expected data types. More... | |
| virtual bool | reset_wf_state (uchar *arg) |
| Reset execution state for such window function types as determined by arg. More... | |
| virtual bool | inform_item_in_cond_of_tab (uchar *) |
| virtual bool | clean_up_after_removal (uchar *arg) |
| Clean up after removing the item from the item tree. More... | |
| virtual bool | collect_scalar_subqueries (uchar *) |
| virtual bool | collect_grouped_aggregates (uchar *) |
| virtual bool | collect_subqueries (uchar *) |
| virtual bool | has_aggregate_ref_in_group_by (uchar *) |
| Check if an aggregate is referenced from within the GROUP BY clause of the query block in which it is aggregated. More... | |
| bool | visit_all_analyzer (uchar **) |
| virtual bool | cache_const_expr_analyzer (uchar **cache_item) |
| Check if an item is a constant one and can be cached. More... | |
| Item * | cache_const_expr_transformer (uchar *item) |
| Cache item if needed. More... | |
| virtual bool | equality_substitution_analyzer (uchar **) |
| virtual Item * | equality_substitution_transformer (uchar *) |
| virtual bool | explain_subquery_checker (uchar **) |
| virtual Item * | explain_subquery_propagator (uchar *) |
| virtual bool | replace_equal_field_checker (uchar **) |
| virtual bool | check_valid_arguments_processor (uchar *) |
| virtual bool | check_gcol_depend_default_processor (uchar *args) |
| Check if a generated expression depends on DEFAULT function with specific column name as argument. More... | |
| virtual Item * | replace_view_refs_with_clone (uchar *arg) |
| Assuming this expression is part of a condition that would be pushed to a materialized derived table, replace, in this expression, each view reference with a clone of the expression in merged derived table's definition. More... | |
| virtual Item * | this_item () |
| virtual const Item * | this_item () const |
| virtual Item ** | this_item_addr (THD *, Item **addr_arg) |
| virtual uint | cols () const |
| virtual Item * | element_index (uint) |
| virtual Item ** | addr (uint) |
| virtual bool | check_cols (uint c) |
| virtual bool | null_inside () |
| virtual void | bring_value () |
| Field * | tmp_table_field_from_field_type (TABLE *table, bool fixed_length) const |
| Create a field based on field_type of argument. More... | |
| virtual Item * | truth_transformer (THD *thd, Bool_test test) |
| Informs an item that it is wrapped in a truth test, in case it wants to transforms itself to implement this test by itself. More... | |
| virtual Item * | replace_scalar_subquery (uchar *) |
| When walking the item tree seeing an Item_singlerow_subselect matching a target, replace it with a substitute field used when transforming scalar subqueries into derived tables. More... | |
| virtual Item * | replace_func_call (uchar *) |
| virtual Item * | replace_item_view_ref (uchar *) |
| virtual Item * | replace_aggregate (uchar *) |
| virtual Item * | replace_outer_ref (uchar *) |
| virtual bool | update_aggr_refs (uchar *) |
| A walker processor overridden by Item_aggregate_ref, q.v. More... | |
| void | delete_self () |
| Delete this item. More... | |
| virtual bool | is_splocal () const |
| virtual Settable_routine_parameter * | get_settable_routine_parameter () |
| bool | is_temporal_with_date () const |
| bool | is_temporal_with_date_and_time () const |
| bool | is_temporal_with_time () const |
| bool | is_temporal () const |
| bool | has_compatible_context (Item *item) const |
| Check whether this and the given item has compatible comparison context. More... | |
| String * | check_well_formed_result (String *str, bool send_error, bool truncate) |
| Verifies that the input string is well-formed according to its character set. More... | |
| bool | eq_by_collation (Item *item, bool binary_cmp, const CHARSET_INFO *cs) |
| CostOfItem | cost () const |
| uint32 | max_char_length () const |
| uint32 | max_char_length (const CHARSET_INFO *cs) const |
| void | fix_char_length (uint32 max_char_length_arg) |
| bool | is_blob_field () const |
| Check if an item either is a blob field, or will be represented as a BLOB field if a field is created based on this item. More... | |
| uint | reference_count () const |
| void | increment_ref_count () |
| Increment reference count. More... | |
| uint | decrement_ref_count () |
| Decrement reference count. More... | |
| bool | has_subquery () const |
| bool | has_stored_program () const |
| bool | has_aggregation () const |
| void | set_aggregation () |
| Set the "has aggregation" property. More... | |
| void | reset_aggregation () |
| Reset the "has aggregation" property. More... | |
| bool | has_wf () const |
| void | set_wf () |
| Set the "has window function" property. More... | |
| bool | has_grouping_set_dep () const |
| void | set_group_by_modifier () |
| Set the property: this item (tree) contains a reference to a GROUP BY modifier (such as ROLLUP) More... | |
| bool | has_grouping_func () const |
| void | set_grouping_func () |
| Set the property: this item is a call to GROUPING. More... | |
| virtual bool | created_by_in2exists () const |
| Whether this Item was created by the IN->EXISTS subquery transformation. More... | |
| void | mark_subqueries_optimized_away () |
| virtual bool | gc_subst_analyzer (uchar **) |
| Analyzer function for GC substitution. More... | |
| virtual Item * | gc_subst_transformer (uchar *) |
| Transformer function for GC substitution. More... | |
| bool | can_be_substituted_for_gc (bool array=false) const |
| Check if this item is of a type that is eligible for GC substitution. More... | |
| void | aggregate_float_properties (enum_field_types type, Item **items, uint nitems) |
| Set max_length and decimals of function if function is floating point and result length/precision depends on argument ones. More... | |
| void | aggregate_decimal_properties (Item **items, uint nitems) |
| Set data type, precision and scale of item of type decimal from list of items. More... | |
| uint32 | aggregate_char_width (Item **items, uint nitems) |
| Calculate the maximum number of characters required by any of the items. More... | |
| void | aggregate_temporal_properties (enum_field_types type, Item **items, uint nitems) |
| Set data type and fractional seconds precision for temporal functions. More... | |
| bool | aggregate_string_properties (enum_field_types type, const char *name, Item **items, uint nitems) |
| Aggregate string properties (character set, collation and maximum length) for string function. More... | |
| void | aggregate_bit_properties (Item **items, uint nitems) |
| Set data type and properties of a BIT column. More... | |
| bool | is_abandoned () const |
| bool | is_nullable () const |
| void | set_nullable (bool nullable) |
| virtual bool | supports_partial_update (const Field_json *field) const |
| Check if this expression can be used for partial update of a given JSON column. More... | |
| virtual void | allow_array_cast () |
| A helper function to ensure proper usage of CAST(. More... | |
| 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) 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 | |
| type_conversion_status | save_in_field_inner (Field *field_arg, bool no_conversions) override |
| Helper function which does all of the work for save_in_field(Field*, bool), except some error checking common to all subclasses, which is performed by save_in_field() itself. More... | |
| Protected Member Functions inherited from Item_field | |
| void | set_field (Field *field) |
| void | fix_after_pullout (Query_block *parent_query_block, Query_block *removed_query_block) override |
| Fix after tables have been moved from one query_block level to the parent level, e.g by semijoin conversion. More... | |
| Protected Member Functions inherited from Item_ident | |
| void | print (const THD *thd, String *str, enum_query_type query_type, const char *db_name_arg, const char *table_name_arg) const |
| Function to print column name for a table. More... | |
| Protected Member Functions inherited from Item | |
| String * | make_empty_result () |
| Sets the result value of the function an empty string, using the current character set. More... | |
| bool | skip_itemize (Item **res) |
| Helper function to skip itemize() for grammar-allocated items. More... | |
| String * | val_string_from_real (String *str) |
| String * | val_string_from_int (String *str) |
| String * | val_string_from_decimal (String *str) |
| String * | val_string_from_date (String *str) |
| String * | val_string_from_datetime (String *str) |
| String * | val_string_from_time (String *str) |
| my_decimal * | val_decimal_from_real (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_int (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_string (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_date (my_decimal *decimal_value) |
| my_decimal * | val_decimal_from_time (my_decimal *decimal_value) |
| longlong | val_int_from_decimal () |
| longlong | val_int_from_date () |
| longlong | val_int_from_time () |
| longlong | val_int_from_datetime () |
| longlong | val_int_from_string () |
| double | val_real_from_decimal () |
| double | val_real_from_string () |
| bool | error_bool () |
| Get the value to return from val_bool() in case of errors. More... | |
| int | error_int () |
| Get the value to return from val_int() in case of errors. More... | |
| double | error_real () |
| Get the value to return from val_real() in case of errors. More... | |
| bool | error_date () |
| Get the value to return from get_date() in case of errors. More... | |
| bool | error_time () |
| Get the value to return from get_time() in case of errors. More... | |
| String * | null_return_str () |
| Gets the value to return from val_str() when returning a NULL value. More... | |
| bool | get_date_from_string (MYSQL_TIME *ltime, my_time_flags_t flags) |
| Convert val_str() to date in MYSQL_TIME. More... | |
| bool | get_date_from_real (MYSQL_TIME *ltime, my_time_flags_t flags) |
| Convert val_real() to date in MYSQL_TIME. More... | |
| bool | get_date_from_decimal (MYSQL_TIME *ltime, my_time_flags_t flags) |
| Convert val_decimal() to date in MYSQL_TIME. More... | |
| bool | get_date_from_int (MYSQL_TIME *ltime, my_time_flags_t flags) |
| Convert val_int() to date in MYSQL_TIME. More... | |
| bool | get_date_from_time (MYSQL_TIME *ltime) |
| Convert get_time() from time to date in MYSQL_TIME. More... | |
| bool | get_date_from_numeric (MYSQL_TIME *ltime, my_time_flags_t fuzzydate) |
| Convert a numeric type to date. More... | |
| bool | get_time_from_string (MYSQL_TIME *ltime) |
| Convert val_str() to time in MYSQL_TIME. More... | |
| bool | get_time_from_real (MYSQL_TIME *ltime) |
| Convert val_real() to time in MYSQL_TIME. More... | |
| bool | get_time_from_decimal (MYSQL_TIME *ltime) |
| Convert val_decimal() to time in MYSQL_TIME. More... | |
| bool | get_time_from_int (MYSQL_TIME *ltime) |
| Convert val_int() to time in MYSQL_TIME. More... | |
| bool | get_time_from_date (MYSQL_TIME *ltime) |
| Convert date to time. More... | |
| bool | get_time_from_datetime (MYSQL_TIME *ltime) |
| Convert datetime to time. More... | |
| bool | get_time_from_numeric (MYSQL_TIME *ltime) |
| Convert a numeric type to time. More... | |
| void | set_accum_properties (const Item *item) |
| Set accumulated properties for an Item. More... | |
| void | add_accum_properties (const Item *item) |
| Add more accumulated properties to an Item. More... | |
| void | set_subquery () |
| Set the "has subquery" property. More... | |
| void | set_stored_program () |
| Set the "has stored program" property. 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... | |
| virtual void | add_json_info (Json_object *json_obj) |
| Add all the node-specific json fields. More... | |
Private Attributes | |
| Item * | arg |
| The argument for this function. More... | |
| uchar * | m_rowbuffer_saved {nullptr} |
| Pointer to row buffer that was used to calculate field value offset. More... | |
| const bool | m_is_values_function |
| This flag is true if the item represents a call to the deprecated VALUES function. More... | |
Additional Inherited Members | |
| Public Types inherited from Item | |
| enum | Type { INVALID_ITEM , FIELD_ITEM , FUNC_ITEM , SUM_FUNC_ITEM , AGGR_FIELD_ITEM , STRING_ITEM , INT_ITEM , DECIMAL_ITEM , REAL_ITEM , NULL_ITEM , HEX_BIN_ITEM , DEFAULT_VALUE_ITEM , COND_ITEM , REF_ITEM , INSERT_VALUE_ITEM , SUBQUERY_ITEM , ROW_ITEM , CACHE_ITEM , TYPE_HOLDER_ITEM , PARAM_ITEM , ROUTINE_FIELD_ITEM , TRIGGER_FIELD_ITEM , XPATH_NODESET_ITEM , VALUES_COLUMN_ITEM } |
| enum | cond_result { COND_UNDEF , COND_OK , COND_TRUE , COND_FALSE } |
| enum | traverse_order { POSTFIX , PREFIX } |
| enum | enum_const_item_cache { CACHE_NONE = 0 , CACHE_JSON_VALUE , CACHE_JSON_ATOM } |
| How to cache constant JSON data. More... | |
| enum | Bool_test { BOOL_IS_TRUE = 0x00 , BOOL_IS_FALSE = 0x01 , BOOL_IS_UNKNOWN = 0x02 , BOOL_NOT_TRUE = 0x03 , BOOL_NOT_FALSE = 0x04 , BOOL_NOT_UNKNOWN = 0x05 , BOOL_IDENTITY = 0x06 , BOOL_NEGATED = 0x07 , BOOL_ALWAYS_TRUE = 0x08 , BOOL_ALWAYS_FALSE = 0x09 } |
| < Modifier for result transformation More... | |
| enum | item_marker { MARKER_NONE = 0 , MARKER_IMPLICIT_NE_ZERO = 1 , MARKER_CONST_PROPAG = 2 , MARKER_BIT = 4 , MARKER_FUNC_DEP_NOT_NULL = 5 , MARKER_DISTINCT_GROUP = 6 , MARKER_COND_DERIVED_TABLE = 7 , MARKER_TRAVERSAL = 8 , MARKER_ICP_COND_USES_INDEX_ONLY = 10 } |
| < Values for member 'marker' More... | |
| Public Types inherited from Parse_tree_node_tmpl< Context > | |
| typedef Context | context_t |
| Static Public Member Functions inherited from Item | |
| static void * | operator new (size_t size) noexcept |
| 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 |
| static enum_field_types | result_to_type (Item_result result) |
| static Item_result | type_to_result (enum_field_types type) |
| static enum_field_types | type_for_variable (enum_field_types src_type) |
| Provide data type for a user or system variable, based on the type of the item that is assigned to the variable. More... | |
| static enum_field_types | string_field_type (uint32 max_bytes) |
| Determine correct string field type, based on string length. More... | |
| static const CHARSET_INFO * | default_charset () |
| 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 Item_field | |
| Table_ref * | table_ref {nullptr} |
| Table containing this resolved field. More... | |
| Field * | field {nullptr} |
| Source field. More... | |
| uint16 | field_index {NO_FIELD_INDEX} |
| Index for this field in table->field array. More... | |
| Item_equal * | item_equal_all_join_nests {nullptr} |
| bool | no_constant_propagation {false} |
| If true, the optimizer's constant propagation will not replace this item with an equal constant. More... | |
| Access_bitmask | have_privileges {0} |
| bool | any_privileges {false} |
| bool | can_use_prefix_key {false} |
| Public Attributes inherited from Item_ident | |
| Name_resolution_context * | context |
| For regularly resolved column references, 'context' points to a name resolution context object belonging to the query block which simply contains the reference. More... | |
| const char * | db_name |
| Schema name of the base table or view the column is part of. More... | |
| const char * | table_name |
| If column is from a non-aliased base table or view, name of base table or view. More... | |
| const char * | field_name |
| If column is aliased, the column alias name. More... | |
| Table_ref * | cached_table |
| Query_block * | depended_from |
| Public Attributes inherited from Item | |
| Item * | next_free |
| Intrusive list pointer for free list. More... | |
| DTCollation | collation |
| Character set and collation properties assigned for this Item. More... | |
| Item_name_string | item_name |
| Name from query. More... | |
| Item_name_string | orig_name |
| Original item name (if it was renamed) More... | |
| uint32 | max_length |
| Maximum length of result of evaluating this item, in number of bytes. More... | |
| item_marker | marker |
| This member has several successive meanings, depending on the phase we're in (. More... | |
| Item_result | cmp_context |
| Comparison context. More... | |
| bool | fixed |
| True if item has been resolved. More... | |
| uint8 | decimals |
| Number of decimals in result when evaluating this item. More... | |
| bool | null_value |
| True if item is null. More... | |
| bool | unsigned_flag |
| bool | m_is_window_function |
| True if item represents window func. More... | |
| bool | hidden {false} |
| If the item is in a SELECT list (Query_block::fields) and hidden is true, the item wasn't actually in the list as given by the user (it was added by the optimizer, to e.g. More... | |
| bool | m_in_check_constraint_exec_ctx {false} |
| True if item is a top most element in the expression being evaluated for a check constraint. More... | |
| Public Attributes inherited from Parse_tree_node_tmpl< Context > | |
| POS | m_pos |
| Static Protected Member Functions inherited from Item | |
| static bool | bit_func_returns_binary (const Item *a, const Item *b) |
| static bool | mark_field_in_map (Mark_field *mark_field, Field *field) |
| Helper function for mark_field_in_map(uchar *arg). More... | |
| Protected Attributes inherited from Item_ident | |
| const char * | m_orig_db_name |
| The fields m_orig_db_name, m_orig_table_name and m_orig_field_name are maintained so that we can provide information about the origin of a column that may have been renamed within the query, e.g. More... | |
| const char * | m_orig_table_name |
| Names the original table that is the source of the field. More... | |
| const char * | m_orig_field_name |
| Names the field in the source base table. More... | |
| bool | m_alias_of_expr |
| if this Item's name is alias of SELECT expression More... | |
| Protected Attributes inherited from Item | |
| String | str_value |
| str_values's main purpose is to cache the value in save_in_field More... | |
| uint8 | m_accum_properties |
| Static Protected Attributes inherited from Item | |
| static constexpr uint8 | PROP_SUBQUERY = 0x01 |
| Set of properties that are calculated by accumulation from underlying items. More... | |
| static constexpr uint8 | PROP_STORED_PROGRAM = 0x02 |
| static constexpr uint8 | PROP_AGGREGATION = 0x04 |
| static constexpr uint8 | PROP_WINDOW_FUNCTION = 0x08 |
| static constexpr uint8 | PROP_HAS_GROUPING_SET_DEP = 0x10 |
| Set if the item or one or more of the underlying items contains a GROUP BY modifier (such as ROLLUP). More... | |
| static constexpr uint8 | PROP_GROUPING_FUNC = 0x20 |
| Set if the item or one or more of the underlying items is a GROUPING function. More... | |
Constructs an Item_insert_value that represents a call to the deprecated VALUES function.
|
inline |
Constructs an Item_insert_value that represents a derived table that wraps a table value constructor.
|
overridevirtual |
Bind objects from the current execution context to field objects in item trees.
Typically used to bind Field objects from TABLEs to Item_field objects.
Reimplemented from Item_field.
|
inlineoverridevirtual |
Check if this item is allowed for a virtual column or inside a default expression.
Should be overridden in child classes.
| [in,out] | args | Due to the limitation of Item::walk() it is declared as a pointer to uchar, underneath there's a actually a structure of type Check_function_as_value_generator_parameters. It is used mainly in Item_field. |
Reimplemented from Item_field.
|
overridevirtual |
Called for every Item after use (preparation and execution).
Release all allocated resources, such as dynamic memory. Prepare for new execution by clearing cached values. Do not remove values allocated during preparation, destructor handles this.
Reimplemented from Item_field.
|
inlineoverridevirtual |
The core function that does the actual itemization.
itemize() is just a wrapper over this.
Reimplemented from Item_field.
|
overridevirtual |
This function is called when:
Reimplemented from Item_field.
Resolve the name of a column reference.
The method resolves the column reference represented by 'this' as a column present in one of: FROM clause, SELECT clause, GROUP BY clause of a query Q, or in outer queries that contain Q.
The name resolution algorithm used is (where [T_j] is an optional table name that qualifies the column name):
Notice that compared to Item_ref::fix_fields, here we first search the FROM clause, and then we search the SELECT and GROUP BY clauses.
For the case where a table reference is already set for the field, we just need to make a call to set_field(). This is true for a cloned field used during condition pushdown to derived tables. A cloned field inherits table reference, depended_from, cached_table, context and field from the original field. set_field() ensures all other members are set correctly.
| [in] | thd | current thread |
| [in,out] | reference | view column if this item was resolved to a view column |
Reimplemented from Item_field.
|
overridevirtual |
This method is used for to:
For more information about view definition query, INFORMATION_SCHEMA query and why they should be generated from the Item-tree,
Reimplemented from Item_field.
|
inlineoverrideprotectedvirtual |
Helper function which does all of the work for save_in_field(Field*, bool), except some error checking common to all subclasses, which is performed by save_in_field() itself.
Subclasses that need to specialize the behaviour of save_in_field(), should override this function instead of save_in_field().
| [in,out] | field | the field to save the item into |
| no_conversions | whether or not to allow conversions of the value |
| TYPE_OK | item saved without any errors or warnings |
| != | TYPE_OK there were errors or warnings when saving the item |
Reimplemented from Item_field.
|
inlineoverridevirtual |
Reimplemented from Item_field.
|
inlineoverridevirtual |
Reimplemented from Item_field.
|
inlineoverridevirtual |
Traverses a tree of Items in prefix and/or postfix order.
Optionally walks into subqueries.
| processor | processor function to be invoked per item returns true to abort traversal, false to continue |
| walk | controls how to traverse the item tree enum_walk::PREFIX: call processor before invoking children enum_walk::POSTFIX: call processor after invoking children enum_walk::SUBQUERY go down into subqueries walk values are bit-coded and may be combined. Omitting both enum_walk::PREFIX and enum_walk::POSTFIX is undefined behaviour. |
| arg | Optional pointer to a walk-specific object |
| false | walk succeeded |
| true | walk aborted by agreement, an error may have been reported |
Reimplemented from Item.
|
private |
The argument for this function.
|
private |
This flag is true if the item represents a call to the deprecated VALUES function.
It is false if the item represents a derived table that wraps a table value constructor.
Pointer to row buffer that was used to calculate field value offset.
1.9.2