A joint patch for:

- MDEV-8093 sql_yacc.yy: add %type create_field for field_spec and column_def

and partially:

- MDEV-8095 Split Create_field

sql/field.cc

@@ -9603,7 +9603,7 @@ void Field_bit_as_char::sql_type(String &res) const
   Convert create_field::length from number of characters to number of bytes.
 */
 
-void Create_field::create_length_to_internal_length(void)
+void Column_definition::create_length_to_internal_length(void)
 {
   switch (sql_type) {
   case MYSQL_TYPE_TINY_BLOB:
@@ -9654,10 +9654,11 @@ void Create_field::create_length_to_internal_length(void)
 /**
   Init for a tmp table field. To be extended if need be.
 */
-void Create_field::init_for_tmp_table(enum_field_types sql_type_arg,
-                                      uint32 length_arg, uint32 decimals_arg,
-                                      bool maybe_null, bool is_unsigned,
-                                      uint pack_length_arg)
+void Column_definition::init_for_tmp_table(enum_field_types sql_type_arg,
+                                           uint32 length_arg,
+                                           uint32 decimals_arg,
+                                           bool maybe_null, bool is_unsigned,
+                                           uint pack_length_arg)
 {
   DBUG_ENTER("Create_field::init_for_tmp_table");
 
@@ -9768,7 +9769,7 @@ static inline bool is_item_func(Item* x)
 }
 
 
-bool Create_field::check(THD *thd)
+bool Column_definition::check(THD *thd)
 {
   const uint conditional_type_modifiers= AUTO_INCREMENT_FLAG;
   uint sign_len, allowed_type_modifier= 0;
@@ -10425,10 +10426,11 @@ Field *make_field(TABLE_SHARE *share,
 
 /** Create a field suitable for create of table. */
 
-Create_field::Create_field(THD *thd, Field *old_field, Field *orig_field)
+Column_definition::Column_definition(THD *thd, Field *old_field,
+                                               Field *orig_field)
 {
   field=      old_field;
-  field_name=change=old_field->field_name;
+  field_name= old_field->field_name;
   length=     old_field->field_length;
   flags=      old_field->flags;
   unireg_check=old_field->unireg_check;

sql/field.h

@@ -3416,16 +3416,14 @@ public:
 
 
 extern const LEX_STRING null_lex_str;
+
 /*
   Create field class for CREATE TABLE
 */
-
-class Create_field :public Sql_alloc
+class Column_definition: public Sql_alloc
 {
 public:
   const char *field_name;
-  const char *change;			// If done with alter table
-  const char *after;			// Put column after this one
   LEX_STRING comment;			// Comment for field
   Item *def, *on_update;                // Default value
   enum	enum_field_types sql_type;
@@ -3464,19 +3462,18 @@ public:
   */
   Virtual_column_info *vcol_info;
 
-  Create_field() :change(0), after(0), comment(null_lex_str),
-                  def(0), on_update(0), sql_type(MYSQL_TYPE_NULL),
-                  flags(0), pack_length(0), key_length(0), interval(0),
-                  srid(0), geom_type(Field::GEOM_GEOMETRY),
-                  field(0), option_list(NULL), option_struct(NULL),
-                  create_if_not_exists(false), vcol_info(0)
+  Column_definition():
+    comment(null_lex_str),
+    def(0), on_update(0), sql_type(MYSQL_TYPE_NULL),
+    flags(0), pack_length(0), key_length(0), interval(0),
+    srid(0), geom_type(Field::GEOM_GEOMETRY),
+    field(0), option_list(NULL), option_struct(NULL),
+    create_if_not_exists(false), vcol_info(0)
   {
     interval_list.empty();
   }
 
-  Create_field(THD *thd, Field *field, Field *orig_field);
-  /* Used to make a clone of this object for ALTER/CREATE TABLE */
-  Create_field *clone(MEM_ROOT *mem_root) const;
+  Column_definition(THD *thd, Field *field, Field *orig_field);
   void create_length_to_internal_length(void);
 
   /* Init for a tmp table field. To be extended if need be. */
@@ -3516,6 +3513,23 @@ public:
 };
 
 
+class Create_field :public Column_definition
+{
+public:
+  const char *change;			// If done with alter table
+  const char *after;			// Put column after this one
+  Create_field():
+    Column_definition(), change(0), after(0)
+  { }
+  Create_field(THD *thd, Field *old_field, Field *orig_field):
+    Column_definition(thd, old_field, orig_field),
+    change(old_field->field_name), after(0)
+  { }
+  /* Used to make a clone of this object for ALTER/CREATE TABLE */
+  Create_field *clone(MEM_ROOT *mem_root) const;
+};
+
+
 /*
   A class for sending info to the client
 */

sql/item_sum.cc

@@ -886,8 +886,8 @@ bool Aggregator_distinct::setup(THD *thd)
   }
   else
   {
-    List<Create_field> field_list;
-    Create_field field_def;                              /* field definition */
+    List<Column_definition> field_list;
+    Column_definition field_def;                /* field definition */
     Item *arg;
     DBUG_ENTER("Aggregator_distinct::setup");
     /* It's legal to call setup() more than once when in a subquery */

sql/rpl_utility.cc

@@ -937,7 +937,7 @@ TABLE *table_def::create_conversion_table(THD *thd, rpl_group_info *rgi,
 {
   DBUG_ENTER("table_def::create_conversion_table");
 
-  List<Create_field> field_list;
+  List<Column_definition> field_list;
   TABLE *conv_table= NULL;
   Relay_log_info *rli= rgi->rli;
   /*
@@ -948,7 +948,7 @@ TABLE *table_def::create_conversion_table(THD *thd, rpl_group_info *rgi,
   uint const cols_to_create= MY_MIN(target_table->s->fields, size());
   for (uint col= 0 ; col < cols_to_create; ++col)
   {
-    Create_field *field_def=
+    Column_definition *field_def=
       (Create_field*) alloc_root(thd->mem_root, sizeof(Create_field));
     bool unsigned_flag= 0;
     if (field_list.push_back(field_def, thd->mem_root))

sql/sp_head.cc

@@ -764,7 +764,7 @@ sp_head::set_stmt_end(THD *thd)
 
 
 static TYPELIB *
-create_typelib(MEM_ROOT *mem_root, Create_field *field_def, List<String> *src)
+create_typelib(MEM_ROOT *mem_root, Column_definition *field_def, List<String> *src)
 {
   TYPELIB *result= NULL;
   CHARSET_INFO *cs= field_def->charset;
@@ -2327,8 +2327,8 @@ sp_head::backpatch(sp_label *lab)
 }
 
 /**
-  Prepare an instance of Create_field for field creation (fill all necessary
-  attributes).
+  Prepare an instance of Column_definition for field creation
+  (fill all necessary attributes).
 
   @param[in]  thd          Thread handle
   @param[in]  lex          Yacc parsing context
@@ -2344,7 +2344,7 @@ sp_head::backpatch(sp_label *lab)
 bool
 sp_head::fill_field_definition(THD *thd, LEX *lex,
                                enum enum_field_types field_type,
-                               Create_field *field_def)
+                               Column_definition *field_def)
 {
   uint unused1= 0;
 

sql/sp_head.h

@@ -181,7 +181,7 @@ public:
   stored_procedure_type m_type;
   uint m_flags;                 // Boolean attributes of a stored routine
 
-  Create_field m_return_field_def; /**< This is used for FUNCTIONs only. */
+  Column_definition m_return_field_def; /**< This is used for FUNCTIONs only. */
 
   const char *m_tmp_query;	///< Temporary pointer to sub query string
   st_sp_chistics *m_chistics;
@@ -419,7 +419,7 @@ public:
 
   bool fill_field_definition(THD *thd, LEX *lex,
                              enum enum_field_types field_type,
-                             Create_field *field_def);
+                             Column_definition *field_def);
 
   void set_info(longlong created, longlong modified,
 		st_sp_chistics *chistics, ulonglong sql_mode);

sql/sp_pcontext.cc

@@ -450,7 +450,7 @@ bool sp_pcontext::find_cursor(LEX_STRING name,
 
 
 void sp_pcontext::retrieve_field_definitions(
-  List<Create_field> *field_def_lst) const
+  List<Column_definition> *field_def_lst) const
 {
   /* Put local/context fields in the result list. */
 

sql/sp_pcontext.h

@@ -60,7 +60,7 @@ public:
   Item *default_value;
 
   /// Full type information (field meta-data) of the SP-variable.
-  Create_field field_def;
+  Column_definition field_def;
 
 public:
   sp_variable(LEX_STRING _name, uint _offset)
@@ -347,7 +347,7 @@ public:
   /// context and its children.
   ///
   /// @param field_def_lst[out] Container to store type information.
-  void retrieve_field_definitions(List<Create_field> *field_def_lst) const;
+  void retrieve_field_definitions(List<Column_definition> *field_def_lst) const;
 
   /// Find SP-variable by name.
   ///

sql/sp_rcontext.cc

@@ -104,7 +104,7 @@ bool sp_rcontext::alloc_arrays(THD *thd)
 
 bool sp_rcontext::init_var_table(THD *thd)
 {
-  List<Create_field> field_def_lst;
+  List<Column_definition> field_def_lst;
 
   if (!m_root_parsing_ctx->max_var_index())
     return false;

sql/sql_lex.h

@@ -2476,7 +2476,7 @@ public:
 
   SQL_I_List<ORDER> proc_list;
   SQL_I_List<TABLE_LIST> auxiliary_table_list, save_list;
-  Create_field	      *last_field;
+  Column_definition *last_field;
   Item_sum *in_sum_func;
   udf_func udf;
   HA_CHECK_OPT   check_opt;			// check/repair options
@@ -2854,7 +2854,7 @@ public:
                     bool is_analyze, bool *printed_anything);
   void restore_set_statement_var();
 
-  void init_last_field(Create_field *field, const char *name, CHARSET_INFO *cs);
+  void init_last_field(Column_definition *field, const char *name, CHARSET_INFO *cs);
   void set_last_field_type(const Lex_field_type_st &type);
   bool set_bincmp(CHARSET_INFO *cs, bool bin);
   // Check if "KEY IF NOT EXISTS name" used outside of ALTER context

sql/sql_select.cc

@@ -16945,12 +16945,12 @@ err:
     0 if out of memory, TABLE object in case of success
 */
 
-TABLE *create_virtual_tmp_table(THD *thd, List<Create_field> &field_list)
+TABLE *create_virtual_tmp_table(THD *thd, List<Column_definition> &field_list)
 {
   uint field_count= field_list.elements;
   uint blob_count= 0;
   Field **field;
-  Create_field *cdef;                           /* column definition */
+  Column_definition *cdef;            /* column definition */
   uint record_length= 0;
   uint null_count= 0;                 /* number of columns which may be null */
   uint null_pack_length;              /* NULL representation array length */
@@ -16978,7 +16978,7 @@ TABLE *create_virtual_tmp_table(THD *thd, List<Create_field> &field_list)
   setup_tmp_table_column_bitmaps(table, bitmaps);
 
   /* Create all fields and calculate the total length of record */
-  List_iterator_fast<Create_field> it(field_list);
+  List_iterator_fast<Column_definition> it(field_list);
   while ((cdef= it++))
   {
     *field= make_field(share, thd->mem_root, 0, cdef->length,

sql/sql_select.h

@@ -1861,7 +1861,7 @@ Field *create_tmp_field(THD *thd, TABLE *table,Item *item, Item::Type type,
   All methods presume that there is at least one field to change.
 */
 
-TABLE *create_virtual_tmp_table(THD *thd, List<Create_field> &field_list);
+TABLE *create_virtual_tmp_table(THD *thd, List<Column_definition> &field_list);
 
 int test_if_item_cache_changed(List<Cached_item> &list);
 int join_init_read_record(JOIN_TAB *tab);

sql/sql_show.cc

@@ -5627,7 +5627,7 @@ bool store_schema_params(THD *thd, TABLE *table, TABLE *proc_table,
   if (sp)
   {
     Field *field;
-    Create_field *field_def;
+    Column_definition *field_def;
     String tmp_string;
     if (routine_type == TYPE_ENUM_FUNCTION)
     {
@@ -5786,7 +5786,7 @@ bool store_schema_proc(THD *thd, TABLE *table, TABLE *proc_table,
           TABLE_SHARE share;
           TABLE tbl;
           Field *field;
-          Create_field *field_def= &sp->m_return_field_def;
+          Column_definition *field_def= &sp->m_return_field_def;
 
           bzero((char*) &tbl, sizeof(TABLE));
           (void) build_table_filename(path, sizeof(path), "", "", "", 0);

sql/sql_table.cc

@@ -71,7 +71,7 @@ static int copy_data_between_tables(THD *thd, TABLE *from,TABLE *to,
                                     Alter_info::enum_enable_or_disable keys_onoff,
                                     Alter_table_ctx *alter_ctx);
 
-static bool prepare_blob_field(THD *thd, Create_field *sql_field);
+static bool prepare_blob_field(THD *thd, Column_definition *sql_field);
 static int mysql_prepare_create_table(THD *, HA_CREATE_INFO *, Alter_info *,
                                       uint *, handler *, KEY **, uint *, int);
 static uint blob_length_by_type(enum_field_types type);
@@ -2875,7 +2875,7 @@ void calculate_interval_lengths(CHARSET_INFO *cs, TYPELIB *interval,
    1	Error
 */
 
-int prepare_create_field(Create_field *sql_field, 
+int prepare_create_field(Column_definition *sql_field,
 			 uint *blob_columns, 
 			 longlong table_flags)
 {
@@ -4235,7 +4235,7 @@ static void set_table_default_charset(THD *thd,
         In this case the error is given
 */
 
-static bool prepare_blob_field(THD *thd, Create_field *sql_field)
+static bool prepare_blob_field(THD *thd, Column_definition *sql_field)
 {
   DBUG_ENTER("prepare_blob_field");
 
@@ -4294,7 +4294,7 @@ static bool prepare_blob_field(THD *thd, Create_field *sql_field)
 
 */
 
-void sp_prepare_create_field(THD *thd, Create_field *sql_field)
+void sp_prepare_create_field(THD *thd, Column_definition *sql_field)
 {
   if (sql_field->sql_type == MYSQL_TYPE_SET ||
       sql_field->sql_type == MYSQL_TYPE_ENUM)

sql/sql_table.h

@@ -23,6 +23,7 @@
 
 class Alter_info;
 class Alter_table_ctx;
+class Column_definition;
 class Create_field;
 struct TABLE_LIST;
 class THD;
@@ -249,8 +250,8 @@ bool log_drop_table(THD *thd, const char *db_name, size_t db_name_length,
 bool quick_rm_table(THD *thd, handlerton *base, const char *db,
                     const char *table_name, uint flags);
 void close_cached_table(THD *thd, TABLE *table);
-void sp_prepare_create_field(THD *thd, Create_field *sql_field);
-int prepare_create_field(Create_field *sql_field,
+void sp_prepare_create_field(THD *thd, Column_definition *sql_field);
+int prepare_create_field(Column_definition *sql_field,
 			 uint *blob_columns,
 			 longlong table_flags);
 CHARSET_INFO* get_sql_field_charset(Create_field *sql_field,

sql/sql_yacc.yy

@@ -853,7 +853,7 @@ static void add_key_to_list(LEX *lex, LEX_STRING *field_name,
   lex->alter_info.key_list.push_back(key, mem_root);
 }
 
-void LEX::init_last_field(Create_field *field, const char *field_name,
+void LEX::init_last_field(Column_definition *field, const char *field_name,
          CHARSET_INFO *cs)
 {
   last_field= field;
@@ -928,6 +928,7 @@ bool LEX::set_bincmp(CHARSET_INFO *cs, bool bin)
   Lex_dyncol_type_st Lex_dyncol_type;
 
   /* pointers */
+  Create_field *create_field;
   CHARSET_INFO *charset;
   Condition_information_item *cond_info_item;
   DYNCALL_CREATE_DEF *dyncol_def;
@@ -1718,6 +1719,8 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
 %type <Lex_dyncol_type> opt_dyncol_type dyncol_type
         numeric_dyncol_type temporal_dyncol_type string_dyncol_type
 
+%type <create_field> field_spec column_def
+
 %type <geom_type> spatial_type
 
 %type <num>
@@ -1882,7 +1885,7 @@ bool my_yyoverflow(short **a, YYSTYPE **b, ulong *yystacksize);
         persistent_column_stat_spec persistent_index_stat_spec
         table_column_list table_index_list table_index_name
         check start checksum
-        field_list field_list_item field_spec kill column_def key_def
+        field_list field_list_item kill key_def
         keycache_list keycache_list_or_parts assign_to_keycache
         assign_to_keycache_parts
         preload_list preload_list_or_parts preload_keys preload_keys_parts
@@ -6006,13 +6009,13 @@ field_list:
         ;
 
 field_list_item:
-          column_def
+          column_def { }
         | key_def
         ;
 
 column_def:
-          field_spec opt_check_constraint
-        | field_spec references
+          field_spec opt_check_constraint { $$= $1; }
+        | field_spec references           { $$= $1; }
         ;
 
 key_def:
@@ -6134,21 +6137,22 @@ field_spec:
               MYSQL_YYABORT;
 
             lex->init_last_field(f, $1.str, NULL);
+            $<create_field>$= f;
           }
           field_type  { Lex->set_last_field_type($3); }
           field_def
           {
             LEX *lex=Lex;
-            Create_field *f= lex->last_field;
+            $$= $<create_field>2;
 
-            if (f->check(thd))
+            if ($$->check(thd))
               MYSQL_YYABORT;
 
-            lex->alter_info.create_list.push_back(f, thd->mem_root);
+            lex->alter_info.create_list.push_back($$, thd->mem_root);
 
-            if (f->flags & PRI_KEY_FLAG)
+            if ($$->flags & PRI_KEY_FLAG)
               add_key_to_list(lex, &$1, Key::PRIMARY, Lex->check_exists);
-            else if (f->flags & UNIQUE_KEY_FLAG)
+            else if ($$->flags & UNIQUE_KEY_FLAG)
               add_key_to_list(lex, &$1, Key::UNIQUE, Lex->check_exists);
           }
         ;
@@ -7564,7 +7568,7 @@ alter_list_item:
           add_column column_def opt_place
           {
             Lex->create_last_non_select_table= Lex->last_table();
-            Lex->last_field->after= $3;
+            $2->after= $3;
           }
         | ADD key_def
           {
@@ -7581,16 +7585,16 @@ alter_list_item:
           {
             Lex->alter_info.flags|= Alter_info::ALTER_CHANGE_COLUMN;
             Lex->create_last_non_select_table= Lex->last_table();
-            Lex->last_field->change= $4.str;
-            Lex->last_field->after= $6;
+            $5->change= $4.str;
+            $5->after= $6;
           }
         | MODIFY_SYM opt_column opt_if_exists_table_element
           field_spec opt_place
           {
             Lex->alter_info.flags|= Alter_info::ALTER_CHANGE_COLUMN;
             Lex->create_last_non_select_table= Lex->last_table();
-            Lex->last_field->change= Lex->last_field->field_name;
-            Lex->last_field->after= $5;
+            $4->change= $4->field_name;
+            $4->after= $5;
           }
         | DROP opt_column opt_if_exists_table_element field_ident opt_restrict
           {