diff options
Diffstat (limited to 'storage/myisam/mi_rnext.c')
| -rw-r--r-- | storage/myisam/mi_rnext.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/storage/myisam/mi_rnext.c b/storage/myisam/mi_rnext.c index 6def5749043..e1a78a04e57 100644 --- a/storage/myisam/mi_rnext.c +++ b/storage/myisam/mi_rnext.c @@ -28,6 +28,7 @@ int mi_rnext(MI_INFO *info, uchar *buf, int inx) { int error,changed; uint flag; + uint update_mask= HA_STATE_NEXT_FOUND; DBUG_ENTER("mi_rnext"); if ((inx = _mi_check_index(info,inx)) < 0) @@ -55,6 +56,20 @@ int mi_rnext(MI_INFO *info, uchar *buf, int inx) info->s->state.key_root[inx]); break; } + /* + "search first" failed. This means we have no pivot for + "search next", or in other words MI_INFO::lastkey is + likely uninitialized. + + Normally SQL layer would never request "search next" if + "search first" failed. But HANDLER may do anything. + + As mi_rnext() without preceeding mi_rkey()/mi_rfirst() + equals to mi_rfirst(), we must restore original state + as if failing mi_rfirst() was not called. + */ + if (error) + update_mask|= HA_STATE_PREV_FOUND; } else { @@ -100,7 +115,7 @@ int mi_rnext(MI_INFO *info, uchar *buf, int inx) } /* Don't clear if database-changed */ info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED); - info->update|= HA_STATE_NEXT_FOUND; + info->update|= update_mask; if (error) { |