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mysql/src/5.1-dbg/sql/sql_select.h

Go to the documentation of this file.

/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB

   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
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


/* classes to use when handling where clause */

#ifdef USE_PRAGMA_INTERFACE
#pragma interface                       /* gcc class implementation */
#endif

#include "procedure.h"
#include <myisam.h>

typedef struct keyuse_t {
  TABLE *table;
  Item  *val;                           /* or value if no field */
  table_map used_tables;
  uint  key, keypart, optimize;
  key_part_map keypart_map;
  ha_rows      ref_table_rows;
  /* 
    If true, the comparison this value was created from will not be
    satisfied if val has NULL 'value'.
  */
  bool null_rejecting;
} KEYUSE;

class store_key;

typedef struct st_table_ref
{
  bool          key_err;
  uint          key_parts;                // num of ...
  uint          key_length;               // length of key_buff
  int           key;                      // key no
  byte          *key_buff;                // value to look for with key
  byte          *key_buff2;               // key_buff+key_length
  store_key     **key_copy;               //
  Item          **items;                  // val()'s for each keypart
  /*
    (null_rejecting & (1<<i)) means the condition is '=' and no matching
    rows will be produced if items[i] IS NULL (see add_not_null_conds())
  */
  key_part_map  null_rejecting;
  table_map     depend_map;               // Table depends on these tables.
  /* null byte position in the key_buf. Used for REF_OR_NULL optimization */
  byte          *null_ref_key;
} TABLE_REF;


/*
  CACHE_FIELD and JOIN_CACHE is used on full join to cache records in outer
  table
*/

typedef struct st_cache_field {
  char *str;
  uint length,blob_length;
  Field_blob *blob_field;
  bool strip;
} CACHE_FIELD;


typedef struct st_join_cache {
  uchar *buff,*pos,*end;
  uint records,record_nr,ptr_record,fields,length,blobs;
  CACHE_FIELD *field,**blob_ptr;
  SQL_SELECT *select;
} JOIN_CACHE;


/*
  The structs which holds the join connections and join states
*/
enum join_type { JT_UNKNOWN,JT_SYSTEM,JT_CONST,JT_EQ_REF,JT_REF,JT_MAYBE_REF,
                 JT_ALL, JT_RANGE, JT_NEXT, JT_FT, JT_REF_OR_NULL,
                 JT_UNIQUE_SUBQUERY, JT_INDEX_SUBQUERY, JT_INDEX_MERGE};

class JOIN;

enum enum_nested_loop_state
{
  NESTED_LOOP_KILLED= -2, NESTED_LOOP_ERROR= -1,
  NESTED_LOOP_OK= 0, NESTED_LOOP_NO_MORE_ROWS= 1,
  NESTED_LOOP_QUERY_LIMIT= 3, NESTED_LOOP_CURSOR_LIMIT= 4
};

typedef enum_nested_loop_state
(*Next_select_func)(JOIN *, struct st_join_table *, bool);
typedef int (*Read_record_func)(struct st_join_table *tab);
Next_select_func setup_end_select_func(JOIN *join);


typedef struct st_join_table {
  st_join_table() {}                          /* Remove gcc warning */
  TABLE         *table;
  KEYUSE        *keyuse;                        /* pointer to first used key */
  SQL_SELECT    *select;
  COND          *select_cond;
  QUICK_SELECT_I *quick;
  Item         **on_expr_ref;   /* pointer to the associated on expression   */
  COND_EQUAL    *cond_equal;    /* multiple equalities for the on expression */
  st_join_table *first_inner;   /* first inner table for including outerjoin */
  bool           found;         /* true after all matches or null complement */
  bool           not_null_compl;/* true before null complement is added      */
  st_join_table *last_inner;    /* last table table for embedding outer join */
  st_join_table *first_upper;  /* first inner table for embedding outer join */
  st_join_table *first_unmatched; /* used for optimization purposes only     */
  const char    *info;
  Read_record_func read_first_record;
  Next_select_func next_select;
  READ_RECORD   read_record;
  double        worst_seeks;
  key_map       const_keys;                     /* Keys with constant part */
  key_map       checked_keys;                   /* Keys checked in find_best */
  key_map       needed_reg;
  key_map       keys;                           /* all keys with can be used */

  /* Either #rows in the table or 1 for const table.  */
  ha_rows       records;
  /*
    Number of records that will be scanned (yes scanned, not returned) by the
    best 'independent' access method, i.e. table scan or QUICK_*_SELECT)
  */
  ha_rows       found_records;
  /*
    Cost of accessing the table using "ALL" or range/index_merge access
    method (but not 'index' for some reason), i.e. this matches method which
    E(#records) is in found_records.
  */
  ha_rows       read_time;
  
  table_map     dependent,key_dependent;
  uint          use_quick,index;
  uint          status;                         // Save status for cache
  uint          used_fields,used_fieldlength,used_blobs;
  enum join_type type;
  bool          cached_eq_ref_table,eq_ref_table,not_used_in_distinct;
  bool          sorted;
  TABLE_REF     ref;
  JOIN_CACHE    cache;
  JOIN          *join;
  /* Bitmap of nested joins this table is part of */
  nested_join_map embedding_map;
  
  void cleanup();
  inline bool is_using_loose_index_scan()
  {
    return (select && select->quick &&
            (select->quick->get_type() ==
             QUICK_SELECT_I::QS_TYPE_GROUP_MIN_MAX));
  }
} JOIN_TAB;

enum_nested_loop_state sub_select_cache(JOIN *join, JOIN_TAB *join_tab, bool
                                        end_of_records);
enum_nested_loop_state sub_select(JOIN *join,JOIN_TAB *join_tab, bool
                                  end_of_records);

/*
  Information about a position of table within a join order. Used in join
  optimization.
*/
typedef struct st_position
{
  double records_read;
  /* 
    Cost accessing the table in course of the entire complete join execution,
    i.e. cost of one access method use (e.g. 'range' or 'ref' scan ) times 
    number the access method will be invoked.
  */
  double read_time;
  JOIN_TAB *table;
  KEYUSE *key;
} POSITION;


typedef struct st_rollup
{
  enum State { STATE_NONE, STATE_INITED, STATE_READY };
  State state;
  Item_null_result **null_items;
  Item ***ref_pointer_arrays;
  List<Item> *fields;
} ROLLUP;


class JOIN :public Sql_alloc
{
  JOIN(const JOIN &rhs);                        /* not implemented */
  JOIN& operator=(const JOIN &rhs);             /* not implemented */
public:
  JOIN_TAB *join_tab,**best_ref;
  JOIN_TAB **map2table;    // mapping between table indexes and JOIN_TABs
  JOIN_TAB *join_tab_save; // saved join_tab for subquery reexecution
  TABLE    **table,**all_tables,*sort_by_table;
  uint     tables,const_tables;
  uint     send_group_parts;
  bool     sort_and_group,first_record,full_join,group, no_field_update;
  bool     do_send_rows;
  /*
    TRUE when we want to resume nested loop iterations when
    fetching data from a cursor
  */
  bool     resume_nested_loop;
  table_map const_table_map,found_const_table_map,outer_join;
  ha_rows  send_records,found_records,examined_rows,row_limit, select_limit;
  /*
    Used to fetch no more than given amount of rows per one
    fetch operation of server side cursor.
    The value is checked in end_send and end_send_group in fashion, similar
    to offset_limit_cnt:
      - fetch_limit= HA_POS_ERROR if there is no cursor.
      - when we open a cursor, we set fetch_limit to 0,
      - on each fetch iteration we add num_rows to fetch to fetch_limit
  */
  ha_rows  fetch_limit;
  POSITION positions[MAX_TABLES+1],best_positions[MAX_TABLES+1];
  
  /* 
    Bitmap of nested joins embedding the position at the end of the current 
    partial join (valid only during join optimizer run).
  */
  nested_join_map cur_embedding_map;

  double   best_read;
  List<Item> *fields;
  List<Cached_item> group_fields, group_fields_cache;
  TABLE    *tmp_table;
  // used to store 2 possible tmp table of SELECT
  TABLE    *exec_tmp_table1, *exec_tmp_table2;
  THD      *thd;
  Item_sum  **sum_funcs, ***sum_funcs_end;
  /* second copy of sumfuncs (for queries with 2 temporary tables */
  Item_sum  **sum_funcs2, ***sum_funcs_end2;
  Procedure *procedure;
  Item      *having;
  Item      *tmp_having; // To store having when processed temporary table
  Item      *having_history; // Store having for explain
  ulonglong  select_options;
  select_result *result;
  TMP_TABLE_PARAM tmp_table_param;
  MYSQL_LOCK *lock;
  // unit structure (with global parameters) for this select
  SELECT_LEX_UNIT *unit;
  // select that processed
  SELECT_LEX *select_lex;
  
  JOIN *tmp_join; // copy of this JOIN to be used with temporary tables
  ROLLUP rollup;                                // Used with rollup

  bool select_distinct;                         // Set if SELECT DISTINCT

  /*
    simple_xxxxx is set if ORDER/GROUP BY doesn't include any references
    to other tables than the first non-constant table in the JOIN.
    It's also set if ORDER/GROUP BY is empty.
  */
  bool simple_order, simple_group;
  /*
    Is set only in case if we have a GROUP BY clause
    and no ORDER BY after constant elimination of 'order'.
  */
  bool no_order;
  /* Is set if we have a GROUP BY and we have ORDER BY on a constant. */
  bool          skip_sort_order;

  bool need_tmp, hidden_group_fields;
  DYNAMIC_ARRAY keyuse;
  Item::cond_result cond_value;
  List<Item> all_fields; // to store all fields that used in query
  //Above list changed to use temporary table
  List<Item> tmp_all_fields1, tmp_all_fields2, tmp_all_fields3;
  //Part, shared with list above, emulate following list
  List<Item> tmp_fields_list1, tmp_fields_list2, tmp_fields_list3;
  List<Item> &fields_list; // hold field list passed to mysql_select
  List<Item> procedure_fields_list;
  int error;

  ORDER *order, *group_list, *proc_param; //hold parameters of mysql_select
  COND *conds;                            // ---"---
  Item *conds_history;                    // store WHERE for explain
  TABLE_LIST *tables_list;           //hold 'tables' parameter of mysql_select
  List<TABLE_LIST> *join_list;       // list of joined tables in reverse order
  COND_EQUAL *cond_equal;
  SQL_SELECT *select;                //created in optimisation phase
  JOIN_TAB *return_tab;              //used only for outer joins
  Item **ref_pointer_array; //used pointer reference for this select
  // Copy of above to be used with different lists
  Item **items0, **items1, **items2, **items3, **current_ref_pointer_array;
  uint ref_pointer_array_size; // size of above in bytes
  const char *zero_result_cause; // not 0 if exec must return zero result
  
  bool union_part; // this subselect is part of union 
  bool optimized; // flag to avoid double optimization in EXPLAIN

  JOIN(THD *thd_arg, List<Item> &fields_arg, ulonglong select_options_arg,
       select_result *result_arg)
    :fields_list(fields_arg)
  {
    init(thd_arg, fields_arg, select_options_arg, result_arg);
  }

  void init(THD *thd_arg, List<Item> &fields_arg, ulonglong select_options_arg,
       select_result *result_arg)
  {
    join_tab= join_tab_save= 0;
    table= 0;
    tables= 0;
    const_tables= 0;
    join_list= 0;
    sort_and_group= 0;
    first_record= 0;
    do_send_rows= 1;
    resume_nested_loop= FALSE;
    send_records= 0;
    found_records= 0;
    fetch_limit= HA_POS_ERROR;
    examined_rows= 0;
    exec_tmp_table1= 0;
    exec_tmp_table2= 0;
    thd= thd_arg;
    sum_funcs= sum_funcs2= 0;
    procedure= 0;
    having= tmp_having= having_history= 0;
    select_options= select_options_arg;
    result= result_arg;
    lock= thd_arg->lock;
    select_lex= 0; //for safety
    tmp_join= 0;
    select_distinct= test(select_options & SELECT_DISTINCT);
    no_order= 0;
    simple_order= 0;
    simple_group= 0;
    skip_sort_order= 0;
    need_tmp= 0;
    hidden_group_fields= 0; /*safety*/
    error= 0;
    select= 0;
    return_tab= 0;
    ref_pointer_array= items0= items1= items2= items3= 0;
    ref_pointer_array_size= 0;
    zero_result_cause= 0;
    optimized= 0;
    cond_equal= 0;

    all_fields= fields_arg;
    fields_list= fields_arg;
    bzero((char*) &keyuse,sizeof(keyuse));
    tmp_table_param.init();
    tmp_table_param.end_write_records= HA_POS_ERROR;
    rollup.state= ROLLUP::STATE_NONE;
  }

  int prepare(Item ***rref_pointer_array, TABLE_LIST *tables, uint wind_num,
              COND *conds, uint og_num, ORDER *order, ORDER *group,
              Item *having, ORDER *proc_param, SELECT_LEX *select,
              SELECT_LEX_UNIT *unit);
  int optimize();
  int reinit();
  void exec();
  int destroy();
  void restore_tmp();
  bool alloc_func_list();
  bool make_sum_func_list(List<Item> &all_fields, List<Item> &send_fields,
                          bool before_group_by, bool recompute= FALSE);

  inline void set_items_ref_array(Item **ptr)
  {
    memcpy((char*) ref_pointer_array, (char*) ptr, ref_pointer_array_size);
    current_ref_pointer_array= ptr;
  }
  inline void init_items_ref_array()
  {
    items0= ref_pointer_array + all_fields.elements;
    memcpy(items0, ref_pointer_array, ref_pointer_array_size);
    current_ref_pointer_array= items0;
  }

  bool rollup_init();
  bool rollup_make_fields(List<Item> &all_fields, List<Item> &fields,
                          Item_sum ***func);
  int rollup_send_data(uint idx);
  int rollup_write_data(uint idx, TABLE *table);
  bool test_in_subselect(Item **where);
  /*
    Release memory and, if possible, the open tables held by this execution
    plan (and nested plans). It's used to release some tables before
    the end of execution in order to increase concurrency and reduce
    memory consumption.
  */
  void join_free();
  /* Cleanup this JOIN, possibly for reuse */
  void cleanup(bool full);
  void clear();
  bool save_join_tab();
  bool send_row_on_empty_set()
  {
    return (do_send_rows && tmp_table_param.sum_func_count != 0 &&
            !group_list);
  }
  bool change_result(select_result *result);
  bool is_top_level_join() const
  {
    return (unit == &thd->lex->unit && (unit->fake_select_lex == 0 ||
                                        select_lex == unit->fake_select_lex));
  }
};


typedef struct st_select_check {
  uint const_ref,reg_ref;
} SELECT_CHECK;

extern const char *join_type_str[];
void TEST_join(JOIN *join);

/* Extern functions in sql_select.cc */
bool store_val_in_field(Field *field, Item *val, enum_check_fields check_flag);
TABLE *create_tmp_table(THD *thd,TMP_TABLE_PARAM *param,List<Item> &fields,
                        ORDER *group, bool distinct, bool save_sum_fields,
                        ulonglong select_options, ha_rows rows_limit,
                        char* alias);
void free_tmp_table(THD *thd, TABLE *entry);
void count_field_types(TMP_TABLE_PARAM *param, List<Item> &fields,
                       bool reset_with_sum_func);
bool setup_copy_fields(THD *thd, TMP_TABLE_PARAM *param,
                       Item **ref_pointer_array,
                       List<Item> &new_list1, List<Item> &new_list2,
                       uint elements, List<Item> &fields);
void copy_fields(TMP_TABLE_PARAM *param);
void copy_funcs(Item **func_ptr);
bool create_myisam_from_heap(THD *thd, TABLE *table, TMP_TABLE_PARAM *param,
                             int error, bool ignore_last_dupp_error);
uint find_shortest_key(TABLE *table, const key_map *usable_keys);
Field* create_tmp_field_from_field(THD *thd, Field* org_field,
                                   const char *name, TABLE *table,
                                   Item_field *item, uint convert_blob_length);
                                                                      
/* functions from opt_sum.cc */
bool simple_pred(Item_func *func_item, Item **args, bool *inv_order);
int opt_sum_query(TABLE_LIST *tables, List<Item> &all_fields,COND *conds);

/* from sql_delete.cc, used by opt_range.cc */
extern "C" int refpos_order_cmp(void* arg, const void *a,const void *b);

/* class to copying an field/item to a key struct */

class store_key :public Sql_alloc
{
 protected:
  Field *to_field;                              // Store data here
  char *null_ptr;
  char err;
 public:
  enum store_key_result { STORE_KEY_OK, STORE_KEY_FATAL, STORE_KEY_CONV };
  store_key(THD *thd, Field *field_arg, char *ptr, char *null, uint length)
    :null_ptr(null),err(0)
  {
    if (field_arg->type() == FIELD_TYPE_BLOB)
    {
        /* Key segments are always packed with a 2 byte length prefix */
      to_field= new Field_varstring(ptr, length, 2, (uchar*) null, 1, 
                                    Field::NONE, field_arg->field_name,
                                    field_arg->table->s, field_arg->charset());
      to_field->init(field_arg->table);
    }
    else
      to_field=field_arg->new_key_field(thd->mem_root, field_arg->table,
                                        ptr, (uchar*) null, 1);
  }
  virtual ~store_key() {}                       /* Not actually needed */
  virtual enum store_key_result copy()=0;
  virtual const char *name() const=0;
};


class store_key_field: public store_key
{
  Copy_field copy_field;
  const char *field_name;
 public:
  store_key_field(THD *thd, Field *to_field_arg, char *ptr, char *null_ptr_arg,
                  uint length, Field *from_field, const char *name_arg)
    :store_key(thd, to_field_arg,ptr,
               null_ptr_arg ? null_ptr_arg : from_field->maybe_null() ? &err
               : NullS,length), field_name(name_arg)
  {
    if (to_field)
    {
      copy_field.set(to_field,from_field,0);
    }
  }
  enum store_key_result copy()
  {
    TABLE *table= copy_field.to_field->table;
    my_bitmap_map *old_map= dbug_tmp_use_all_columns(table,
                                                     table->write_set);
    copy_field.do_copy(&copy_field);
    dbug_tmp_restore_column_map(table->write_set, old_map);
    return err != 0 ? STORE_KEY_FATAL : STORE_KEY_OK;
  }
  const char *name() const { return field_name; }
};


class store_key_item :public store_key
{
 protected:
  Item *item;
public:
  store_key_item(THD *thd, Field *to_field_arg, char *ptr, char *null_ptr_arg,
                 uint length, Item *item_arg)
    :store_key(thd, to_field_arg,ptr,
               null_ptr_arg ? null_ptr_arg : item_arg->maybe_null ?
               &err : NullS, length), item(item_arg)
  {}
  enum store_key_result copy()
  {
    TABLE *table= to_field->table;
    my_bitmap_map *old_map= dbug_tmp_use_all_columns(table,
                                                     table->write_set);
    int res= item->save_in_field(to_field, 1);
    dbug_tmp_restore_column_map(table->write_set, old_map);
    return (err != 0 || res > 2 ? STORE_KEY_FATAL : (store_key_result) res); 
                         
  }
  const char *name() const { return "func"; }
};


class store_key_const_item :public store_key_item
{
  bool inited;
public:
  store_key_const_item(THD *thd, Field *to_field_arg, char *ptr,
                       char *null_ptr_arg, uint length,
                       Item *item_arg)
    :store_key_item(thd, to_field_arg,ptr,
                    null_ptr_arg ? null_ptr_arg : item_arg->maybe_null ?
                    &err : NullS, length, item_arg), inited(0)
  {
  }
  enum store_key_result copy()
  {
    int res;
    if (!inited)
    {
      inited=1;
      if ((res= item->save_in_field(to_field, 1)))
      {       
        if (!err)
          err= res;
      }
    }
    return (err > 2 ?  STORE_KEY_FATAL : (store_key_result) err);
  }
  const char *name() const { return "const"; }
};

bool cp_buffer_from_ref(THD *thd, TABLE *table, TABLE_REF *ref);
bool error_if_full_join(JOIN *join);
int report_error(TABLE *table, int error);
int safe_index_read(JOIN_TAB *tab);
COND *remove_eq_conds(THD *thd, COND *cond, Item::cond_result *cond_value);

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© 1995-2008 MySQL AB, 2008 Sun Microsystems, Inc.

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