Commit 392c3122 authored by unknown's avatar unknown
Browse files

BUG#22178: Scan ordered performed also on engines not supporting ordered scans 

Scan of ranges without start key should not use ordered scans unless it
is requested.


sql/ha_partition.cc:
  Scan of ranges without start key should not use ordered scans unless it
  is requested.
sql/ha_partition.h:
  Scan of ranges without start key should not use ordered scans unless it
  is requested.
parent c690c11f

sql/ha_partition.cc

+16 −1
Original line number Diff line number Diff line
@@ -3655,7 +3655,10 @@ int ha_partition::read_range_first(const key_range *start_key, 


  if (!start_key)				// Read first record

  {

    if (m_ordered)

      m_index_scan_type= partition_index_first;

    else

      m_index_scan_type= partition_index_first_unordered;

    error= common_first_last(m_rec0);

  }

  else
@@ -3869,6 +3872,18 @@ int ha_partition::handle_unordered_scan_next_partition(byte * buf) 
      DBUG_PRINT("info", ("index_first on partition %d", i));

      error= file->index_first(buf);

      break;

    case partition_index_first_unordered:

      /*

        We perform a scan without sorting and this means that we

        should not use the index_first since not all handlers

        support it and it is also unnecessary to restrict sort

        order.

      */

      DBUG_PRINT("info", ("read_range_first on partition %d", i));

      table->record[0]= buf;

      error= file->read_range_first(0, end_range, eq_range, 0);

      table->record[0]= m_rec0;

      break;

    default:

      DBUG_ASSERT(FALSE);

      DBUG_RETURN(1);

sql/ha_partition.h

+4 −3
Original line number Diff line number Diff line
@@ -45,9 +45,10 @@ class ha_partition :public handler 
  {

    partition_index_read= 0,

    partition_index_first= 1,

    partition_index_last= 2,

    partition_index_read_last= 3,

    partition_no_index_scan= 4

    partition_index_first_unordered= 2,

    partition_index_last= 3,

    partition_index_read_last= 4,

    partition_no_index_scan= 5

  };

  /* Data for the partition handler */

  int  m_mode;                          // Open mode