mirror of
https://github.com/MariaDB/server.git
synced 2025-07-29 05:21:33 +03:00
Apply clang-tidy to remove empty constructors / destructors
This patch is the result of running run-clang-tidy -fix -header-filter=.* -checks='-*,modernize-use-equals-default' . Code style changes have been done on top. The result of this change leads to the following improvements: 1. Binary size reduction. * For a -DBUILD_CONFIG=mysql_release build, the binary size is reduced by ~400kb. * A raw -DCMAKE_BUILD_TYPE=Release reduces the binary size by ~1.4kb. 2. Compiler can better understand the intent of the code, thus it leads to more optimization possibilities. Additionally it enabled detecting unused variables that had an empty default constructor but not marked so explicitly. Particular change required following this patch in sql/opt_range.cc result_keys, an unused template class Bitmap now correctly issues unused variable warnings. Setting Bitmap template class constructor to default allows the compiler to identify that there are no side-effects when instantiating the class. Previously the compiler could not issue the warning as it assumed Bitmap class (being a template) would not be performing a NO-OP for its default constructor. This prevented the "unused variable warning".
This commit is contained in:
Vicențiu Ciorbaru
108
sql/sql_type.h
108
sql/sql_type.h
@ -252,7 +252,7 @@ class Dec_ptr
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{
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protected:
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my_decimal *m_ptr;
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Dec_ptr() { }
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Dec_ptr() = default;
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public:
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Dec_ptr(my_decimal *ptr) :m_ptr(ptr) { }
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bool is_null() const { return m_ptr == NULL; }
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@ -395,7 +395,7 @@ protected:
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{
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m_sec= m_usec= m_neg= m_truncated= 0;
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}
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Sec6() { }
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Sec6() = default;
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bool add_nanoseconds(uint nanoseconds)
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{
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DBUG_ASSERT(nanoseconds <= 1000000000);
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@ -555,7 +555,7 @@ protected:
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Sec6::make_from_int(nr);
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m_nsec= 0;
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}
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Sec9() { }
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Sec9() = default;
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public:
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Sec9(const my_decimal *d)
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{
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@ -2707,7 +2707,7 @@ class Timestamp_or_zero_datetime_native:
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public NativeBuffer<STRING_BUFFER_TIMESTAMP_BINARY_SIZE>
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{
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public:
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Timestamp_or_zero_datetime_native() { }
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Timestamp_or_zero_datetime_native() = default;
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Timestamp_or_zero_datetime_native(const Timestamp_or_zero_datetime &ts,
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uint decimals)
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{
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@ -3168,7 +3168,7 @@ public:
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Type_all_attributes(const Type_all_attributes *other)
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:Type_std_attributes(other)
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{ }
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virtual ~Type_all_attributes() {}
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virtual ~Type_all_attributes() = default;
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virtual void set_maybe_null(bool maybe_null_arg)= 0;
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// Returns total number of decimal digits
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virtual uint decimal_precision() const= 0;
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@ -3188,7 +3188,7 @@ public:
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class Type_cmp_attributes
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{
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public:
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virtual ~Type_cmp_attributes() { }
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virtual ~Type_cmp_attributes() = default;
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virtual CHARSET_INFO *compare_collation() const= 0;
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};
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@ -3579,7 +3579,7 @@ public:
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{
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return false;
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}
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virtual ~Type_handler() {}
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virtual ~Type_handler() = default;
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/**
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Determines MariaDB traditional data types that always present
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in the server.
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@ -4025,7 +4025,7 @@ class Type_handler_row: public Type_handler
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{
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static const Name m_name_row;
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public:
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virtual ~Type_handler_row() {}
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virtual ~Type_handler_row() = default;
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const Name name() const override { return m_name_row; }
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bool is_scalar_type() const override { return false; }
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bool can_return_int() const override { return false; }
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@ -4401,7 +4401,7 @@ public:
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bool Item_func_min_max_get_date(THD *thd, Item_func_min_max*,
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MYSQL_TIME *, date_mode_t fuzzydate) const
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override;
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virtual ~Type_handler_numeric() { }
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virtual ~Type_handler_numeric() = default;
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bool can_change_cond_ref_to_const(Item_bool_func2 *target,
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Item *target_expr, Item *target_value,
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Item_bool_func2 *source,
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@ -4421,7 +4421,7 @@ class Type_handler_real_result: public Type_handler_numeric
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public:
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Item_result result_type() const { return REAL_RESULT; }
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Item_result cmp_type() const { return REAL_RESULT; }
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virtual ~Type_handler_real_result() {}
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virtual ~Type_handler_real_result() = default;
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const Type_handler *type_handler_for_comparison() const;
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void Column_definition_reuse_fix_attributes(THD *thd,
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Column_definition *c,
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@ -4507,7 +4507,7 @@ public:
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}
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Item_result result_type() const { return DECIMAL_RESULT; }
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Item_result cmp_type() const { return DECIMAL_RESULT; }
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virtual ~Type_handler_decimal_result() {};
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virtual ~Type_handler_decimal_result() = default;
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const Type_handler *type_handler_for_comparison() const;
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int stored_field_cmp_to_item(THD *thd, Field *field, Item *item) const
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{
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@ -4737,7 +4737,7 @@ public:
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Item_result cmp_type() const { return INT_RESULT; }
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bool is_order_clause_position_type() const { return true; }
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bool is_limit_clause_valid_type() const { return true; }
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virtual ~Type_handler_int_result() {}
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virtual ~Type_handler_int_result() = default;
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const Type_handler *type_handler_for_comparison() const;
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int stored_field_cmp_to_item(THD *thd, Field *field, Item *item) const;
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bool subquery_type_allows_materialization(const Item *inner,
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@ -4832,7 +4832,7 @@ protected:
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public:
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Item_result result_type() const { return STRING_RESULT; }
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Item_result cmp_type() const { return TIME_RESULT; }
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virtual ~Type_handler_temporal_result() {}
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virtual ~Type_handler_temporal_result() = default;
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void make_sort_key(uchar *to, Item *item, const SORT_FIELD_ATTR *sort_field,
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Sort_param *param) const;
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void sortlength(THD *thd,
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@ -4914,7 +4914,7 @@ public:
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Item_result result_type() const { return STRING_RESULT; }
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Item_result cmp_type() const { return STRING_RESULT; }
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CHARSET_INFO *charset_for_protocol(const Item *item) const;
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virtual ~Type_handler_string_result() {}
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virtual ~Type_handler_string_result() = default;
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const Type_handler *type_handler_for_comparison() const;
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int stored_field_cmp_to_item(THD *thd, Field *field, Item *item) const;
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const Type_handler *
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@ -5084,7 +5084,7 @@ class Type_handler_tiny: public Type_handler_general_purpose_int
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static const Type_limits_int m_limits_sint8;
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static const Type_limits_int m_limits_uint8;
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public:
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virtual ~Type_handler_tiny() {}
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virtual ~Type_handler_tiny() = default;
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const Name name() const { return m_name_tiny; }
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enum_field_types field_type() const { return MYSQL_TYPE_TINY; }
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protocol_send_type_t protocol_send_type() const
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@ -5129,7 +5129,7 @@ class Type_handler_short: public Type_handler_general_purpose_int
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static const Type_limits_int m_limits_sint16;
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static const Type_limits_int m_limits_uint16;
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public:
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virtual ~Type_handler_short() {}
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virtual ~Type_handler_short() = default;
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const Name name() const { return m_name_short; }
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enum_field_types field_type() const { return MYSQL_TYPE_SHORT; }
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protocol_send_type_t protocol_send_type() const
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@ -5174,7 +5174,7 @@ class Type_handler_long: public Type_handler_general_purpose_int
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static const Type_limits_int m_limits_sint32;
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static const Type_limits_int m_limits_uint32;
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public:
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virtual ~Type_handler_long() {}
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virtual ~Type_handler_long() = default;
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const Name name() const { return m_name_int; }
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enum_field_types field_type() const { return MYSQL_TYPE_LONG; }
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protocol_send_type_t protocol_send_type() const
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@ -5230,7 +5230,7 @@ class Type_handler_longlong: public Type_handler_general_purpose_int
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static const Type_limits_int m_limits_sint64;
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static const Type_limits_int m_limits_uint64;
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public:
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virtual ~Type_handler_longlong() {}
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virtual ~Type_handler_longlong() = default;
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const Name name() const { return m_name_longlong; }
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enum_field_types field_type() const { return MYSQL_TYPE_LONGLONG; }
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protocol_send_type_t protocol_send_type() const
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@ -5276,7 +5276,7 @@ public:
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class Type_handler_vers_trx_id: public Type_handler_longlong
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{
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public:
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virtual ~Type_handler_vers_trx_id() {}
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virtual ~Type_handler_vers_trx_id() = default;
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Field *make_table_field(const LEX_CSTRING *name,
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const Record_addr &addr,
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const Type_all_attributes &attr,
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@ -5290,7 +5290,7 @@ class Type_handler_int24: public Type_handler_general_purpose_int
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static const Type_limits_int m_limits_sint24;
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static const Type_limits_int m_limits_uint24;
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public:
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virtual ~Type_handler_int24() {}
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virtual ~Type_handler_int24() = default;
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const Name name() const { return m_name_mediumint; }
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enum_field_types field_type() const { return MYSQL_TYPE_INT24; }
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protocol_send_type_t protocol_send_type() const
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@ -5331,7 +5331,7 @@ class Type_handler_year: public Type_handler_int_result
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{
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static const Name m_name_year;
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public:
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virtual ~Type_handler_year() {}
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virtual ~Type_handler_year() = default;
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const Name name() const { return m_name_year; }
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enum_field_types field_type() const { return MYSQL_TYPE_YEAR; }
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protocol_send_type_t protocol_send_type() const
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@ -5383,7 +5383,7 @@ class Type_handler_bit: public Type_handler_int_result
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{
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static const Name m_name_bit;
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public:
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virtual ~Type_handler_bit() {}
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virtual ~Type_handler_bit() = default;
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const Name name() const { return m_name_bit; }
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enum_field_types field_type() const { return MYSQL_TYPE_BIT; }
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protocol_send_type_t protocol_send_type() const
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@ -5441,7 +5441,7 @@ class Type_handler_float: public Type_handler_real_result
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{
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static const Name m_name_float;
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public:
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virtual ~Type_handler_float() {}
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virtual ~Type_handler_float() = default;
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const Name name() const { return m_name_float; }
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enum_field_types field_type() const { return MYSQL_TYPE_FLOAT; }
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protocol_send_type_t protocol_send_type() const
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@ -5491,7 +5491,7 @@ class Type_handler_double: public Type_handler_real_result
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{
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static const Name m_name_double;
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public:
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virtual ~Type_handler_double() {}
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virtual ~Type_handler_double() = default;
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const Name name() const { return m_name_double; }
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enum_field_types field_type() const { return MYSQL_TYPE_DOUBLE; }
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protocol_send_type_t protocol_send_type() const
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@ -5540,7 +5540,7 @@ class Type_handler_time_common: public Type_handler_temporal_result
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{
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static const Name m_name_time;
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public:
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virtual ~Type_handler_time_common() { }
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virtual ~Type_handler_time_common() = default;
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const Name name() const { return m_name_time; }
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enum_field_types field_type() const { return MYSQL_TYPE_TIME; }
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protocol_send_type_t protocol_send_type() const
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@ -5630,7 +5630,7 @@ class Type_handler_time: public Type_handler_time_common
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static uint m_hires_bytes[MAX_DATETIME_PRECISION+1];
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public:
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static uint hires_bytes(uint dec) { return m_hires_bytes[dec]; }
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virtual ~Type_handler_time() {}
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virtual ~Type_handler_time() = default;
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const Name version() const { return m_version_mariadb53; }
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uint32 calc_pack_length(uint32 length) const;
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Field *make_conversion_table_field(TABLE *, uint metadata,
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@ -5656,7 +5656,7 @@ public:
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class Type_handler_time2: public Type_handler_time_common
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{
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public:
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virtual ~Type_handler_time2() {}
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virtual ~Type_handler_time2() = default;
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const Name version() const { return m_version_mysql56; }
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enum_field_types real_field_type() const { return MYSQL_TYPE_TIME2; }
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uint32 calc_pack_length(uint32 length) const;
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@ -5683,7 +5683,7 @@ public:
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class Type_handler_temporal_with_date: public Type_handler_temporal_result
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{
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public:
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virtual ~Type_handler_temporal_with_date() {}
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virtual ~Type_handler_temporal_with_date() = default;
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Item_literal *create_literal_item(THD *thd, const char *str, size_t length,
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CHARSET_INFO *cs, bool send_error) const;
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bool Item_eq_value(THD *thd, const Type_cmp_attributes *attr,
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@ -5708,7 +5708,7 @@ class Type_handler_date_common: public Type_handler_temporal_with_date
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{
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static const Name m_name_date;
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public:
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virtual ~Type_handler_date_common() {}
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virtual ~Type_handler_date_common() = default;
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const Name name() const { return m_name_date; }
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const Type_handler *type_handler_for_comparison() const;
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enum_field_types field_type() const { return MYSQL_TYPE_DATE; }
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@ -5753,7 +5753,7 @@ public:
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class Type_handler_date: public Type_handler_date_common
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{
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public:
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virtual ~Type_handler_date() {}
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virtual ~Type_handler_date() = default;
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uint32 calc_pack_length(uint32 length) const { return 4; }
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Field *make_conversion_table_field(TABLE *, uint metadata,
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const Field *target) const;
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@ -5778,7 +5778,7 @@ public:
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class Type_handler_newdate: public Type_handler_date_common
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{
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public:
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virtual ~Type_handler_newdate() {}
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virtual ~Type_handler_newdate() = default;
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enum_field_types real_field_type() const { return MYSQL_TYPE_NEWDATE; }
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uint32 calc_pack_length(uint32 length) const { return 3; }
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Field *make_conversion_table_field(TABLE *, uint metadata,
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@ -5805,7 +5805,7 @@ class Type_handler_datetime_common: public Type_handler_temporal_with_date
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{
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static const Name m_name_datetime;
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public:
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virtual ~Type_handler_datetime_common() {}
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virtual ~Type_handler_datetime_common() = default;
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const Name name() const { return m_name_datetime; }
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const Type_handler *type_handler_for_comparison() const;
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enum_field_types field_type() const { return MYSQL_TYPE_DATETIME; }
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@ -5863,7 +5863,7 @@ class Type_handler_datetime: public Type_handler_datetime_common
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static uint m_hires_bytes[MAX_DATETIME_PRECISION + 1];
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public:
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static uint hires_bytes(uint dec) { return m_hires_bytes[dec]; }
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virtual ~Type_handler_datetime() {}
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virtual ~Type_handler_datetime() = default;
|
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const Name version() const { return m_version_mariadb53; }
|
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uint32 calc_pack_length(uint32 length) const;
|
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Field *make_conversion_table_field(TABLE *, uint metadata,
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@ -5889,7 +5889,7 @@ public:
|
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class Type_handler_datetime2: public Type_handler_datetime_common
|
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{
|
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public:
|
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virtual ~Type_handler_datetime2() {}
|
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virtual ~Type_handler_datetime2() = default;
|
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const Name version() const { return m_version_mysql56; }
|
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enum_field_types real_field_type() const { return MYSQL_TYPE_DATETIME2; }
|
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uint32 calc_pack_length(uint32 length) const;
|
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@ -5919,7 +5919,7 @@ class Type_handler_timestamp_common: public Type_handler_temporal_with_date
|
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protected:
|
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bool TIME_to_native(THD *, const MYSQL_TIME *from, Native *to, uint dec) const;
|
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public:
|
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virtual ~Type_handler_timestamp_common() {}
|
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virtual ~Type_handler_timestamp_common() = default;
|
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const Name name() const { return m_name_timestamp; }
|
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const Type_handler *type_handler_for_comparison() const;
|
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const Type_handler *type_handler_for_native_format() const;
|
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@ -5999,7 +5999,7 @@ class Type_handler_timestamp: public Type_handler_timestamp_common
|
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static uint m_sec_part_bytes[MAX_DATETIME_PRECISION + 1];
|
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public:
|
||||
static uint sec_part_bytes(uint dec) { return m_sec_part_bytes[dec]; }
|
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virtual ~Type_handler_timestamp() {}
|
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virtual ~Type_handler_timestamp() = default;
|
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const Name version() const { return m_version_mariadb53; }
|
||||
uint32 calc_pack_length(uint32 length) const;
|
||||
Field *make_conversion_table_field(TABLE *, uint metadata,
|
||||
@ -6025,7 +6025,7 @@ public:
|
||||
class Type_handler_timestamp2: public Type_handler_timestamp_common
|
||||
{
|
||||
public:
|
||||
virtual ~Type_handler_timestamp2() {}
|
||||
virtual ~Type_handler_timestamp2() = default;
|
||||
const Name version() const { return m_version_mysql56; }
|
||||
enum_field_types real_field_type() const { return MYSQL_TYPE_TIMESTAMP2; }
|
||||
uint32 calc_pack_length(uint32 length) const;
|
||||
@ -6055,7 +6055,7 @@ class Type_handler_olddecimal: public Type_handler_decimal_result
|
||||
{
|
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static const Name m_name_decimal;
|
||||
public:
|
||||
virtual ~Type_handler_olddecimal() {}
|
||||
virtual ~Type_handler_olddecimal() = default;
|
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const Name name() const { return m_name_decimal; }
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_DECIMAL; }
|
||||
uint32 calc_pack_length(uint32 length) const { return length; }
|
||||
@ -6086,7 +6086,7 @@ class Type_handler_newdecimal: public Type_handler_decimal_result
|
||||
{
|
||||
static const Name m_name_decimal;
|
||||
public:
|
||||
virtual ~Type_handler_newdecimal() {}
|
||||
virtual ~Type_handler_newdecimal() = default;
|
||||
const Name name() const { return m_name_decimal; }
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_NEWDECIMAL; }
|
||||
uint32 calc_pack_length(uint32 length) const;
|
||||
@ -6126,7 +6126,7 @@ class Type_handler_null: public Type_handler_general_purpose_string
|
||||
{
|
||||
static const Name m_name_null;
|
||||
public:
|
||||
virtual ~Type_handler_null() {}
|
||||
virtual ~Type_handler_null() = default;
|
||||
const Name name() const { return m_name_null; }
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_NULL; }
|
||||
const Type_handler *type_handler_for_comparison() const;
|
||||
@ -6186,7 +6186,7 @@ class Type_handler_string: public Type_handler_longstr
|
||||
{
|
||||
static const Name m_name_char;
|
||||
public:
|
||||
virtual ~Type_handler_string() {}
|
||||
virtual ~Type_handler_string() = default;
|
||||
const Name name() const override { return m_name_char; }
|
||||
enum_field_types field_type() const override { return MYSQL_TYPE_STRING; }
|
||||
ulong KEY_pack_flags(uint column_nr) const override
|
||||
@ -6225,7 +6225,7 @@ class Type_handler_var_string: public Type_handler_string
|
||||
{
|
||||
static const Name m_name_var_string;
|
||||
public:
|
||||
virtual ~Type_handler_var_string() {}
|
||||
virtual ~Type_handler_var_string() = default;
|
||||
const Name name() const { return m_name_var_string; }
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_VAR_STRING; }
|
||||
enum_field_types real_field_type() const { return MYSQL_TYPE_STRING; }
|
||||
@ -6254,7 +6254,7 @@ class Type_handler_varchar: public Type_handler_longstr
|
||||
{
|
||||
static const Name m_name_varchar;
|
||||
public:
|
||||
virtual ~Type_handler_varchar() {}
|
||||
virtual ~Type_handler_varchar() = default;
|
||||
const Name name() const override { return m_name_varchar; }
|
||||
enum_field_types field_type() const override { return MYSQL_TYPE_VARCHAR; }
|
||||
ulong KEY_pack_flags(uint column_nr) const override
|
||||
@ -6310,7 +6310,7 @@ class Type_handler_hex_hybrid: public Type_handler_varchar
|
||||
{
|
||||
static const Name m_name_hex_hybrid;
|
||||
public:
|
||||
virtual ~Type_handler_hex_hybrid() {}
|
||||
virtual ~Type_handler_hex_hybrid() = default;
|
||||
const Name name() const override { return m_name_hex_hybrid; }
|
||||
const Type_handler *cast_to_int_type_handler() const override;
|
||||
const Type_handler *type_handler_for_system_time() const override;
|
||||
@ -6336,7 +6336,7 @@ public:
|
||||
class Type_handler_blob_common: public Type_handler_longstr
|
||||
{
|
||||
public:
|
||||
virtual ~Type_handler_blob_common() { }
|
||||
virtual ~Type_handler_blob_common() = default;
|
||||
Field *make_conversion_table_field(TABLE *, uint metadata,
|
||||
const Field *target) const override;
|
||||
ulong KEY_pack_flags(uint column_nr) const override
|
||||
@ -6390,7 +6390,7 @@ class Type_handler_tiny_blob: public Type_handler_blob_common
|
||||
{
|
||||
static const Name m_name_tinyblob;
|
||||
public:
|
||||
virtual ~Type_handler_tiny_blob() {}
|
||||
virtual ~Type_handler_tiny_blob() = default;
|
||||
const Name name() const override { return m_name_tinyblob; }
|
||||
enum_field_types field_type() const override { return MYSQL_TYPE_TINY_BLOB; }
|
||||
uint32 calc_pack_length(uint32 length) const override;
|
||||
@ -6406,7 +6406,7 @@ class Type_handler_medium_blob: public Type_handler_blob_common
|
||||
{
|
||||
static const Name m_name_mediumblob;
|
||||
public:
|
||||
virtual ~Type_handler_medium_blob() {}
|
||||
virtual ~Type_handler_medium_blob() = default;
|
||||
const Name name() const override { return m_name_mediumblob; }
|
||||
enum_field_types field_type() const override
|
||||
{ return MYSQL_TYPE_MEDIUM_BLOB; }
|
||||
@ -6423,7 +6423,7 @@ class Type_handler_long_blob: public Type_handler_blob_common
|
||||
{
|
||||
static const Name m_name_longblob;
|
||||
public:
|
||||
virtual ~Type_handler_long_blob() {}
|
||||
virtual ~Type_handler_long_blob() = default;
|
||||
const Name name() const { return m_name_longblob; }
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_LONG_BLOB; }
|
||||
uint32 calc_pack_length(uint32 length) const;
|
||||
@ -6441,7 +6441,7 @@ class Type_handler_blob: public Type_handler_blob_common
|
||||
{
|
||||
static const Name m_name_blob;
|
||||
public:
|
||||
virtual ~Type_handler_blob() {}
|
||||
virtual ~Type_handler_blob() = default;
|
||||
const Name name() const { return m_name_blob; }
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_BLOB; }
|
||||
uint32 calc_pack_length(uint32 length) const;
|
||||
@ -6471,7 +6471,7 @@ class Type_handler_geometry: public Type_handler_string_result
|
||||
{
|
||||
static const Name m_name_geometry;
|
||||
public:
|
||||
virtual ~Type_handler_geometry() {}
|
||||
virtual ~Type_handler_geometry() = default;
|
||||
const Name name() const { return m_name_geometry; }
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_GEOMETRY; }
|
||||
bool is_param_long_data_type() const { return true; }
|
||||
@ -6572,7 +6572,7 @@ extern MYSQL_PLUGIN_IMPORT Type_handler_geometry type_handler_geometry;
|
||||
class Type_handler_typelib: public Type_handler_general_purpose_string
|
||||
{
|
||||
public:
|
||||
virtual ~Type_handler_typelib() { }
|
||||
virtual ~Type_handler_typelib() = default;
|
||||
enum_field_types field_type() const { return MYSQL_TYPE_STRING; }
|
||||
const Type_handler *type_handler_for_item_field() const;
|
||||
const Type_handler *cast_to_int_type_handler() const;
|
||||
@ -6608,7 +6608,7 @@ class Type_handler_enum: public Type_handler_typelib
|
||||
{
|
||||
static const Name m_name_enum;
|
||||
public:
|
||||
virtual ~Type_handler_enum() {}
|
||||
virtual ~Type_handler_enum() = default;
|
||||
const Name name() const { return m_name_enum; }
|
||||
enum_field_types real_field_type() const { return MYSQL_TYPE_ENUM; }
|
||||
enum_field_types traditional_merge_field_type() const
|
||||
@ -6640,7 +6640,7 @@ class Type_handler_set: public Type_handler_typelib
|
||||
{
|
||||
static const Name m_name_set;
|
||||
public:
|
||||
virtual ~Type_handler_set() {}
|
||||
virtual ~Type_handler_set() = default;
|
||||
const Name name() const { return m_name_set; }
|
||||
enum_field_types real_field_type() const { return MYSQL_TYPE_SET; }
|
||||
enum_field_types traditional_merge_field_type() const
|
||||
@ -6813,7 +6813,7 @@ class Type_aggregator
|
||||
const Type_handler *m_handler1;
|
||||
const Type_handler *m_handler2;
|
||||
const Type_handler *m_result;
|
||||
Pair() { }
|
||||
Pair() = default;
|
||||
Pair(const Type_handler *handler1,
|
||||
const Type_handler *handler2,
|
||||
const Type_handler *result)
|
||||
|
||||
Reference in New Issue
Block a user