[MDEV-20716] Unify make_table_field() and make_table_field_from_def() for integer and real types - Jira

In order to remove some duplicate code and simplify creating data type plugins, lets unify these Type_handler methods:

  virtual Field *make_table_field(MEM_ROOT *root,

                                  const LEX_CSTRING *name,

                                  const Record_addr &addr,

                                  const Type_all_attributes &attr,

                                  TABLE *table) const= 0;

and

  virtual Field *

  make_table_field_from_def(TABLE_SHARE *share,

                            MEM_ROOT *mem_root,

                            const LEX_CSTRING *name,

                            const Record_addr &addr,

                            const Bit_addr &bit,

                            const Column_definition_attributes *attr,

                            uint32 flags) const= 0;

for Type_handler_int_result and Type_handler_real_result descendants.

Let's add a new constructor:

Column_definition_attributes::

  Column_definition_attributes(const Type_all_attributes &attr)

 :length(attr.max_length),

  decimals(attr.decimals),

  unireg_check(Field::NONE),

  interval(attr.get_typelib()),

  charset(attr.collation.collation),

  srid(0),

  pack_flag(attr.unsigned_flag ? 0 : FIELDFLAG_DECIMAL)

{}

Let's remove these virtual method implementations:

Instead, let's add these two virtual method implementations:

Field *Type_handler_int_result::make_table_field(MEM_ROOT *root,

                                            const LEX_CSTRING *name,

                                            const Record_addr &addr,

                                            const Type_all_attributes &attr,

                                            TABLE_SHARE *share) const

  DBUG_ASSERT(is_unsigned() == attr.unsigned_flag);

  Column_definition_attributes dattr(attr);

  return make_table_field_from_def(share, root, name, addr,

                                   Bit_addr(), &dattr, 0);

Field *

Type_handler_real_result::make_table_field(MEM_ROOT *root,

                                           const LEX_CSTRING *name,

                                           const Record_addr &addr,

                                           const Type_all_attributes &attr,

                                           TABLE_SHARE *share) const

  Column_definition_attributes dattr(attr);

  return make_table_field_from_def(share, root, name, addr,

                                   Bit_addr(), &dattr, 0);

Note, later, in separate changes, we'll also unify the same methods for descendants of:

blocks

MDEV-4912 Data type plugin API version 1

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