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Viewing changes to storage/innobase/include/row0ext.h

  • Committer: Brian Aker
  • Date: 2009-04-27 14:36:40 UTC
  • Revision ID: brian@gaz-20090427143640-f6zjmtt9vm55qgm2
Patch on show processlist from  davi@apache.org

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storage/innobase/include/row0ext.h
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 51 Franklin
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St, Fifth Floor, Boston, MA 02110-1301 USA
 
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/row0ext.h
 
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/******************************************************
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Caching of externally stored column prefixes
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Created September 2006 Marko Makela
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#include "data0types.h"
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#include "mem0mem.h"
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/********************************************************************//**
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Creates a cache of column prefixes of externally stored columns.
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@return own: column prefix cache */
 
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/************************************************************************
 
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Creates a cache of column prefixes of externally stored columns. */
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UNIV_INTERN
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row_ext_t*
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row_ext_create(
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/*===========*/
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        ulint           n_ext,  /*!< in: number of externally stored columns */
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        const ulint*    ext,    /*!< in: col_no's of externally stored columns
 
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                                /* out,own: column prefix cache */
 
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        ulint           n_ext,  /* in: number of externally stored columns */
 
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        const ulint*    ext,    /* in: col_no's of externally stored columns
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                                in the InnoDB table object, as reported by
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                                dict_col_get_no(); NOT relative to the records
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                                in the clustered index */
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        const dtuple_t* tuple,  /*!< in: data tuple containing the field
 
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        const dtuple_t* tuple,  /* in: data tuple containing the field
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                                references of the externally stored
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                                columns; must be indexed by col_no;
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                                the clustered index record must be
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                                covered by a lock or a page latch
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                                to prevent deletion (rollback or purge). */
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        ulint           zip_size,/*!< compressed page size in bytes, or 0 */
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        mem_heap_t*     heap);  /*!< in: heap where created */
 
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        ulint           zip_size,/* compressed page size in bytes, or 0 */
 
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        mem_heap_t*     heap);  /* in: heap where created */
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/********************************************************************//**
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Looks up a column prefix of an externally stored column.
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@return column prefix, or NULL if the column is not stored externally,
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or pointer to field_ref_zero if the BLOB pointer is unset */
 
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/************************************************************************
 
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Looks up a column prefix of an externally stored column. */
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UNIV_INLINE
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const byte*
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row_ext_lookup_ith(
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/*===============*/
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        const row_ext_t*        ext,    /*!< in/out: column prefix cache */
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        ulint                   i,      /*!< in: index of ext->ext[] */
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        ulint*                  len);   /*!< out: length of prefix, in bytes,
 
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                                        /* out: column prefix, or NULL if
 
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                                        the column is not stored externally,
 
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                                        or pointer to field_ref_zero
 
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                                        if the BLOB pointer is unset */
 
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        const row_ext_t*        ext,    /* in/out: column prefix cache */
 
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        ulint                   i,      /* in: index of ext->ext[] */
 
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        ulint*                  len);   /* out: length of prefix, in bytes,
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                                        at most REC_MAX_INDEX_COL_LEN */
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/********************************************************************//**
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Looks up a column prefix of an externally stored column.
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@return column prefix, or NULL if the column is not stored externally,
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or pointer to field_ref_zero if the BLOB pointer is unset */
 
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/************************************************************************
 
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Looks up a column prefix of an externally stored column. */
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UNIV_INLINE
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const byte*
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row_ext_lookup(
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/*===========*/
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        const row_ext_t*        ext,    /*!< in: column prefix cache */
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        ulint                   col,    /*!< in: column number in the InnoDB
 
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                                        /* out: column prefix, or NULL if
 
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                                        the column is not stored externally,
 
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                                        or pointer to field_ref_zero
 
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                                        if the BLOB pointer is unset */
 
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        const row_ext_t*        ext,    /* in: column prefix cache */
 
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        ulint                   col,    /* in: column number in the InnoDB
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                                        table object, as reported by
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                                        dict_col_get_no(); NOT relative to the
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                                        records in the clustered index */
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        ulint*                  len);   /*!< out: length of prefix, in bytes,
 
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        ulint*                  len);   /* out: length of prefix, in bytes,
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                                        at most REC_MAX_INDEX_COL_LEN */
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/** Prefixes of externally stored columns */
 
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/* Prefixes of externally stored columns */
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struct row_ext_struct{
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        ulint           n_ext;  /*!< number of externally stored columns */
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        const ulint*    ext;    /*!< col_no's of externally stored columns */
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        byte*           buf;    /*!< backing store of the column prefix cache */
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        ulint           len[1]; /*!< prefix lengths; 0 if not cached */
 
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        ulint           n_ext;  /* number of externally stored columns */
 
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        const ulint*    ext;    /* col_no's of externally stored columns */
 
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        byte*           buf;    /* backing store of the column prefix cache */
 
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        ulint           len[1]; /* prefix lengths; 0 if not cached */
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};
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#ifndef UNIV_NONINL