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  • Committer: Package Import Robot
  • Author(s): Clint Byrum
  • Date: 2012-06-19 10:46:49 UTC
  • mfrom: (1.1.6)
  • mto: This revision was merged to the branch mainline in revision 29.
  • Revision ID: package-import@ubuntu.com-20120619104649-e2l0ggd4oz3um0f4
Tags: upstream-7.1.36-stable
Import upstream version 7.1.36-stable

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drizzled/optimizer/access_method/scan.cc
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 */
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#include <config.h>
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#include <drizzled/session.h>
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#include <drizzled/join_table.h>
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#include <drizzled/table.h>
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#include <drizzled/sql_select.h>
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#include <drizzled/internal/my_sys.h>
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#include <drizzled/optimizer/access_method/scan.h>
 
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#include <drizzled/util/test.h>
 
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#include <drizzled/statistics_variables.h>
 
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#include <drizzled/session.h>
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using namespace drizzled;
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static uint32_t make_join_orderinfo(Join *join);
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bool optimizer::Scan::getStats(Table *table,
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                               JoinTable *join_tab)
 
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void optimizer::Scan::getStats(Table& table, JoinTable& join_tab)
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{
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  Join *join= join_tab->join;
 
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  Join *join= join_tab.join;
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  bool statistics= test(! (join->select_options & SELECT_DESCRIBE));
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  uint64_t options= (join->select_options &
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                     (SELECT_DESCRIBE | SELECT_NO_JOIN_CACHE)) |
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                     (0);
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  uint32_t no_jbuf_after= make_join_orderinfo(join);
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  uint32_t index= join_tab - join->join_tab;
 
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  uint32_t index= &join_tab - join->join_tab;
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  /*
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   * If previous table use cache
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   * If the incoming data set is already sorted don't use cache.
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   */
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  table->status= STATUS_NO_RECORD;
 
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  table.status= STATUS_NO_RECORD;
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  if (index != join->const_tables && 
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      ! (options & SELECT_NO_JOIN_CACHE) &&
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      join_tab->use_quick != 2 && 
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      ! join_tab->first_inner && 
 
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      join_tab.use_quick != 2 && 
 
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      ! join_tab.first_inner && 
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      index <= no_jbuf_after &&
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      ! join_tab->insideout_match_tab)
 
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      ! join_tab.insideout_match_tab)
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  {
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    if ((options & SELECT_DESCRIBE) ||
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        ! join_init_cache(join->session,
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                          join->join_tab + join->const_tables,
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                          index - join->const_tables))
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    {
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      join_tab[-1].next_select= sub_select_cache; /* Patch previous */
 
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      (&join_tab)[-1].next_select= sub_select_cache; /* Patch previous */
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    }
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  }
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  /* These init changes read_record */
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  if (join_tab->use_quick == 2)
 
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  if (join_tab.use_quick == 2)
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  {
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    join->session->server_status|= SERVER_QUERY_NO_GOOD_INDEX_USED;
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    join_tab->read_first_record= join_init_quick_read_record;
 
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    join_tab.read_first_record= join_init_quick_read_record;
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    if (statistics)
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    {
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      join->session->status_var.select_range_check_count++;
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  }
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  else
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  {
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    join_tab->read_first_record= join_init_read_record;
 
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    join_tab.read_first_record= join_init_read_record;
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    if (index == join->const_tables)
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    {
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      if (join_tab->select && join_tab->select->quick)
 
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      if (join_tab.select && join_tab.select->quick)
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      {
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        if (statistics)
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        {
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          join->session->status_var.select_range_count++;
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        }
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      }
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      else
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      {
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        join->session->server_status|= SERVER_QUERY_NO_INDEX_USED;
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        if (statistics)
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        {
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          join->session->status_var.select_scan_count++;
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        }
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      }
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    }
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    else
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    {
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      if (join_tab->select && join_tab->select->quick)
 
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      if (join_tab.select && join_tab.select->quick)
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      {
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        if (statistics)
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        {
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          join->session->status_var.select_full_range_join_count++;
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        }
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      }
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      else
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      {
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        join->session->server_status|= SERVER_QUERY_NO_INDEX_USED;
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        if (statistics)
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        {
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          join->session->status_var.select_full_join_count++;
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        }
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      }
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    }
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    if (! table->no_keyread)
 
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    if (! table.no_keyread)
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    {
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      if (join_tab->select && 
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          join_tab->select->quick &&
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          join_tab->select->quick->index != MAX_KEY && //not index_merge
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          table->covering_keys.test(join_tab->select->quick->index))
 
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      if (join_tab.select && 
 
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          join_tab.select->quick &&
 
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          join_tab.select->quick->index != MAX_KEY && //not index_merge
 
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          table.covering_keys.test(join_tab.select->quick->index))
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      {
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        table->key_read= 1;
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        table->cursor->extra(HA_EXTRA_KEYREAD);
 
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        table.key_read= 1;
 
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        table.cursor->extra(HA_EXTRA_KEYREAD);
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      }
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      else if (! table->covering_keys.none() &&
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               ! (join_tab->select && join_tab->select->quick))
 
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      else if (! table.covering_keys.none() && ! (join_tab.select && join_tab.select->quick))
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      { // Only read index tree
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        if (! join_tab->insideout_match_tab)
 
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        if (! join_tab.insideout_match_tab)
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        {
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          /*
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             See bug #26447: "Using the clustered index for a table scan
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             is always faster than using a secondary index".
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           */
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          if (table->getShare()->hasPrimaryKey() &&
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              table->cursor->primary_key_is_clustered())
 
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          if (table.getShare()->hasPrimaryKey() &&
 
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              table.cursor->primary_key_is_clustered())
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          {
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            join_tab->index= table->getShare()->getPrimaryKey();
 
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            join_tab.index= table.getShare()->getPrimaryKey();
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          }
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          else
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          {
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            join_tab->index= table->find_shortest_key(&table->covering_keys);
 
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            join_tab.index= table.find_shortest_key(&table.covering_keys);
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          }
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        }
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        join_tab->read_first_record= join_read_first;
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        join_tab->type= AM_NEXT; // Read with index_first / index_next
 
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        join_tab.read_first_record= join_read_first;
 
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        join_tab.type= AM_NEXT; // Read with index_first / index_next
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      }
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    }
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  }
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  return false;
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}
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/**
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*/
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static uint32_t make_join_orderinfo(Join *join)
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{
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  uint32_t i= 0;
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  if (join->need_tmp)
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  {
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    return join->tables;
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  }
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  for (i= join->const_tables ; i < join->tables ; i++)
 
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  uint32_t i= join->const_tables;
 
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  for (; i < join->tables; i++)
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  {
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    JoinTable *tab= join->join_tab + i;
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    Table *table= tab->table;