diff options
Diffstat (limited to 'sql/sql_type.h')
| -rw-r--r-- | sql/sql_type.h | 46 |
1 files changed, 45 insertions, 1 deletions
diff --git a/sql/sql_type.h b/sql/sql_type.h index aa1fe1a9f7e..8ea5b9ddde1 100644 --- a/sql/sql_type.h +++ b/sql/sql_type.h @@ -2,7 +2,7 @@ #define SQL_TYPE_H_INCLUDED /* Copyright (c) 2015 MariaDB Foundation. - Copyright (c) 2015, 2020, MariaDB Corporation. + Copyright (c) 2015, 2021, MariaDB Corporation. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -45,6 +45,7 @@ class Item_param; class Item_cache; class Item_copy; class Item_func_or_sum; +class Item_sum; class Item_sum_hybrid; class Item_sum_sum; class Item_sum_avg; @@ -3764,6 +3765,14 @@ public: incompatible data type. */ virtual bool is_param_long_data_type() const { return false; } + /* + The base type handler "this" is derived from. + "This" inherits aggregation rules from the base type handler. + */ + virtual const Type_handler *type_handler_base() const + { + return NULL; + } virtual const Type_handler *type_handler_for_comparison() const= 0; virtual const Type_handler *type_handler_for_native_format() const { @@ -7471,6 +7480,41 @@ public: const Type_handler *h0, const Type_handler *h1); }; + +class Type_handler_pair +{ + const Type_handler *m_a; + const Type_handler *m_b; +public: + Type_handler_pair(const Type_handler *a, + const Type_handler *b) + :m_a(a), m_b(b) + { } + const Type_handler *a() const { return m_a; } + const Type_handler *b() const { return m_b; } + /* + Change both handlers to their parent data type handlers, if available. + For example, VARCHAR/JSON -> VARCHAR. + @returns The number of handlers changed (0,1 or 2). + */ + bool to_base() + { + bool rc= false; + const Type_handler *na= m_a->type_handler_base(); + const Type_handler *nb= m_b->type_handler_base(); + if (na) + { + m_a= na; rc= true; + } + if (nb) + { + m_b= nb; rc= true; + } + return rc; + } +}; + + /* Helper template to simplify creating builtin types with names. Plugin types inherit from Type_handler_xxx types that do not set the name in |