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Implement worklog #5743 InnoDB: Lift the limit of index key prefixes.

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With this change, the index prefix column length lifted from 767 bytes
to 3072 bytes if "innodb_large_prefix" is set to "true".

rb://603 approved by Marko
This commit is contained in:
Jimmy Yang 2011-05-31 02:12:32 -07:00
commit 9e2b7fa7d5
31 changed files with 827 additions and 156 deletions
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13
storage/innobase/include/row0ext.h
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@ -30,6 +30,7 @@ Created September 2006 Marko Makela
#include "row0types.h"
#include "data0types.h"
#include "mem0mem.h"
#include "dict0types.h"
/********************************************************************//**
Creates a cache of column prefixes of externally stored columns.
@ -43,13 +44,13 @@ row_ext_create(
in the InnoDB table object, as reported by
dict_col_get_no(); NOT relative to the records
in the clustered index */
ulint flags, /*!< in: table->flags */
const dtuple_t* tuple, /*!< in: data tuple containing the field
references of the externally stored
columns; must be indexed by col_no;
the clustered index record must be
covered by a lock or a page latch
to prevent deletion (rollback or purge). */
ulint zip_size,/*!< compressed page size in bytes, or 0 */
mem_heap_t* heap); /*!< in: heap where created */
/********************************************************************//**
@ -63,7 +64,8 @@ row_ext_lookup_ith(
const row_ext_t* ext, /*!< in/out: column prefix cache */
ulint i, /*!< in: index of ext->ext[] */
ulint* len); /*!< out: length of prefix, in bytes,
at most REC_MAX_INDEX_COL_LEN */
at most the length determined by
DICT_MAX_FIELD_LEN_BY_FORMAT() */
/********************************************************************//**
Looks up a column prefix of an externally stored column.
@return column prefix, or NULL if the column is not stored externally,
@ -78,13 +80,18 @@ row_ext_lookup(
dict_col_get_no(); NOT relative to the
records in the clustered index */
ulint* len); /*!< out: length of prefix, in bytes,
at most REC_MAX_INDEX_COL_LEN */
at most the length determined by
DICT_MAX_FIELD_LEN_BY_FORMAT() */
/** Prefixes of externally stored columns */
struct row_ext_struct{
ulint n_ext; /*!< number of externally stored columns */
const ulint* ext; /*!< col_no's of externally stored columns */
byte* buf; /*!< backing store of the column prefix cache */
ulint max_len;/*!< maximum prefix length, it could be
REC_ANTELOPE_MAX_INDEX_COL_LEN or
REC_VERSION_56_MAX_INDEX_COL_LEN depending
on row format */
ulint len[1]; /*!< prefix lengths; 0 if not cached */
};