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- Committer: Jay Pipes
- Date: 2009-06-11 20:45:34 UTC
- mto: This revision was merged to the branch mainline in revision 1061.
- Revision ID: jpipes@serialcoder-20090611204534-oz8iqxwlazqriuf4
Doxygenates documentation for name_resolution_context.h
- files modified:
- drizzled/name_resolution_context.h
added
removed
drizzled/name_resolution_context.h
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class Session;
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class Select_Lex;
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/*
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Instances of Name_resolution_context store the information necesary for
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name resolution of Items and other context analysis of a query made in
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fix_fields().
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This structure is a part of Select_Lex, a pointer to this structure is
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assigned when an item is created (which happens mostly during parsing
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(sql_yacc.yy)), but the structure itself will be initialized after parsing
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is complete
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TODO: move subquery of INSERT ... SELECT and CREATE ... SELECT to
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separate Select_Lex which allow to remove tricks of changing this
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structure before and after INSERT/CREATE and its SELECT to make correct
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field name resolution.
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*/
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/**
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* Instances of Name_resolution_context store the information necesary for
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* name resolution of Items and other context analysis of a query made in
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* fix_fields().
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*
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* This structure is a part of Select_Lex, a pointer to this structure is
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* assigned when an item is created (which happens mostly during parsing
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* (sql_yacc.yy)), but the structure itself will be initialized after parsing
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* is complete
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*
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* @todo
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*
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* Move subquery of INSERT ... SELECT and CREATE ... SELECT to
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* separate Select_Lex which allow to remove tricks of changing this
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* structure before and after INSERT/CREATE and its SELECT to make correct
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* field name resolution.
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*/
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class Name_resolution_context: public Sql_alloc
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{
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public:
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/*
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The name resolution context to search in when an Item cannot be
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resolved in this context (the context of an outer select)
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*/
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/**
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* The name resolution context to search in when an Item cannot be
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* resolved in this context (the context of an outer select)
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*/
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Name_resolution_context *outer_context;
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/*
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List of tables used to resolve the items of this context. Usually these
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are tables from the FROM clause of SELECT statement. The exceptions are
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INSERT ... SELECT and CREATE ... SELECT statements, where SELECT
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subquery is not moved to a separate Select_Lex. For these types of
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statements we have to change this member dynamically to ensure correct
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name resolution of different parts of the statement.
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*/
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/**
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* List of tables used to resolve the items of this context. Usually these
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* are tables from the FROM clause of SELECT statement. The exceptions are
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* INSERT ... SELECT and CREATE ... SELECT statements, where SELECT
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* subquery is not moved to a separate Select_Lex. For these types of
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* statements we have to change this member dynamically to ensure correct
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* name resolution of different parts of the statement.
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*/
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TableList *table_list;
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/*
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In most cases the two table references below replace 'table_list' above
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for the purpose of name resolution. The first and last name resolution
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table references allow us to search only in a sub-tree of the nested
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join tree in a FROM clause. This is needed for NATURAL JOIN, JOIN ... USING
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and JOIN ... ON.
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*/
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/**
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* In most cases the two table references below replace 'table_list' above
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* for the purpose of name resolution. The first and last name resolution
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* table references allow us to search only in a sub-tree of the nested
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* join tree in a FROM clause. This is needed for NATURAL JOIN, JOIN ... USING
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* and JOIN ... ON.
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*/
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TableList *first_name_resolution_table;
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/*
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Last table to search in the list of leaf table references that begins
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with first_name_resolution_table.
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*/
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/**
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* Last table to search in the list of leaf table references that begins
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* with first_name_resolution_table.
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*/
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TableList *last_name_resolution_table;
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/*
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Select_Lex item belong to, in case of merged VIEW it can differ from
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Select_Lex where item was created, so we can't use table_list/field_list
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from there
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*/
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/**
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* Select_Lex item belong to, in case of merged VIEW it can differ from
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* Select_Lex where item was created, so we can't use table_list/field_list
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* from there
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*/
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Select_Lex *select_lex;
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/*
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Processor of errors caused during Item name resolving, now used only to
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hide underlying tables in errors about views (i.e. it substitute some
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errors for views)
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*/
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/**
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* Processor of errors caused during Item name resolving, now used only to
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* hide underlying tables in errors about views (i.e. it substitute some
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* errors for views)
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*/
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void (*error_processor)(Session *, void *);
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void *error_processor_data;
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/*
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When true items are resolved in this context both against the
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SELECT list and this->table_list. If false, items are resolved
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only against this->table_list.
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*/
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/**
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* When true items are resolved in this context both against the
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* SELECT list and this->table_list. If false, items are resolved
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* only against this->table_list.
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*/
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bool resolve_in_select_list;
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/*
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Security context of this name resolution context. It's used for views
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and is non-zero only if the view is defined with SQL SECURITY DEFINER.
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*/
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/**
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* Security context of this name resolution context. It's used for views
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* and is non-zero only if the view is defined with SQL SECURITY DEFINER.
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*/
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Security_context *security_ctx;
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Name_resolution_context()
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:outer_context(0), table_list(0), select_lex(0),
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error_processor_data(0),
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security_ctx(0)
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:
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outer_context(0),
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table_list(0),
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select_lex(0),
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error_processor_data(0),
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security_ctx(0)
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{}
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void init()
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{
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resolve_in_select_list= false;
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error_processor= &dummy_error_processor;
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first_name_resolution_table= NULL;
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last_name_resolution_table= NULL;
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}
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void resolve_in_table_list_only(TableList *tables)
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{
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table_list= first_name_resolution_table= tables;
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resolve_in_select_list= false;
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}
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void process_error(Session *session)
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{
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(*error_processor)(session, error_processor_data);
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}
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inline void init()
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{
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resolve_in_select_list= false;
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error_processor= &dummy_error_processor;
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first_name_resolution_table= NULL;
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last_name_resolution_table= NULL;
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}
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inline void resolve_in_table_list_only(TableList *tables)
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{
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table_list= first_name_resolution_table= tables;
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resolve_in_select_list= false;
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}
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inline void process_error(Session *session)
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{
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(*error_processor)(session, error_processor_data);
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}
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};
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#endif /* DRIZZLED_NAME_RESOLUTION_CONTEXT_H */
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