Purpose
Return row based on position.
Synopsis
virtual int rnd_pos
( |
buf, |
|
| |
pos); |
|
| byte * |
buf
; |
| byte * |
pos
; |
Description
This is the rnd_pos method.
Used for finding row previously marked with position. This is
useful for large sorts.
This is like rnd_next, but you are given a position to use to
determine the row. The position will be of the type that you
stored in ref. You can use ha_get_ptr(pos,ref_length) to
retrieve whatever key or position you saved when position() was
called. Called from filesort.cc records.cc sql_insert.cc
sql_select.cc sql_update.cc.
Parameters
Return Values
This function has no return values.
Usage
Locate row based on position value and return in buffer
provided.
