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drizzled/join_cache.cc
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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
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 *  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
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 *
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 *  Copyright (C) 2008-2009 Sun Microsystems, Inc.
 
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 *  Copyright (C) 2008-2009 Sun Microsystems
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 *
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 *  This program is free software; you can redistribute it and/or modify
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 *  it under the terms of the GNU General Public License as published by
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 * @{
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 */
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#include "config.h"
 
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#include "drizzled/server_includes.h"
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#include "drizzled/sql_select.h" /* include join.h */
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#include "drizzled/field/blob.h"
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#include "drizzled/drizzled.h"
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#include "drizzled/internal/my_sys.h"
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#include <algorithm>
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using namespace std;
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namespace drizzled
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{
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static uint32_t used_blob_length(CacheField **ptr);
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static uint32_t used_blob_length(CacheField **ptr)
 
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static uint32_t used_blob_length(CACHE_FIELD **ptr);
 
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static uint32_t used_blob_length(CACHE_FIELD **ptr)
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{
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  uint32_t length,blob_length;
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  for (length=0 ; *ptr ; ptr++)
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******************************************************************************/
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int join_init_cache(Session *session, JoinTable *tables, uint32_t table_count)
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{
 
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  register unsigned int i;
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  unsigned int length, blobs;
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  size_t size;
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  CacheField *copy,**blob_ptr;
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  JoinCache  *cache;
 
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  CACHE_FIELD *copy,**blob_ptr;
 
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  JOIN_CACHE  *cache;
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  JoinTable *join_tab;
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  cache= &tables[table_count].cache;
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  cache->fields=blobs=0;
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  join_tab= tables;
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  for (unsigned int i= 0; i < table_count ; i++, join_tab++)
 
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  for (i=0 ; i < table_count ; i++,join_tab++)
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  {
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    if (!join_tab->used_fieldlength)            /* Not calced yet */
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      calc_used_field_length(session, join_tab);
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    if (join_tab->rowid_keep_flags & JoinTable::KEEP_ROWID)
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    {
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      cache->fields++;
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      join_tab->used_fieldlength += join_tab->table->cursor->ref_length;
 
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      join_tab->used_fieldlength += join_tab->table->file->ref_length;
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    }
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  }
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  if (!(cache->field=(CacheField*)
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        memory::sql_alloc(sizeof(CacheField)*(cache->fields+table_count*2)+(blobs+1)* sizeof(CacheField*))))
 
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  if (!(cache->field=(CACHE_FIELD*)
 
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        sql_alloc(sizeof(CACHE_FIELD)*(cache->fields+table_count*2)+(blobs+1)*
 
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                  sizeof(CACHE_FIELD*))))
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  {
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    size= cache->end - cache->buff;
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    global_join_buffer.sub(size);
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    free((unsigned char*) cache->buff);
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    cache->buff=0;
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    return(1);
 
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    free((unsigned char*) cache->buff);         /* purecov: inspected */
 
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    cache->buff=0;                              /* purecov: inspected */
 
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    return(1);                          /* purecov: inspected */
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  }
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  copy=cache->field;
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  blob_ptr=cache->blob_ptr=(CacheField**)
 
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  blob_ptr=cache->blob_ptr=(CACHE_FIELD**)
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    (cache->field+cache->fields+table_count*2);
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  length=0;
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  for (unsigned int i= 0 ; i < table_count ; i++)
 
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  for (i=0 ; i < table_count ; i++)
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  {
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    uint32_t null_fields=0, used_fields;
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    Field **f_ptr,*field;
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    for (f_ptr= tables[i].table->getFields(), used_fields= tables[i].used_fields; used_fields; f_ptr++)
 
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    for (f_ptr= tables[i].table->field,used_fields= tables[i].used_fields; used_fields; f_ptr++)
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    {
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      field= *f_ptr;
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      if (field->isReadSet())
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    if (null_fields && tables[i].table->getNullFields())
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    {                                           /* must copy null bits */
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      copy->str= tables[i].table->null_flags;
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      copy->length= tables[i].table->getShare()->null_bytes;
 
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      copy->length= tables[i].table->s->null_bytes;
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      copy->strip=0;
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      copy->blob_field=0;
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      copy->get_rowid= NULL;
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    /* SemiJoinDuplicateElimination: Allocate space for rowid if needed */
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    if (tables[i].rowid_keep_flags & JoinTable::KEEP_ROWID)
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    {
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      copy->str= tables[i].table->cursor->ref;
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      copy->length= tables[i].table->cursor->ref_length;
 
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      copy->str= tables[i].table->file->ref;
 
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      copy->length= tables[i].table->file->ref_length;
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      copy->strip=0;
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      copy->blob_field=0;
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      copy->get_rowid= NULL;
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  cache->blobs= blobs;
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  *blob_ptr= NULL;                                      /* End sequentel */
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  size= max((size_t) session->variables.join_buff_size, (size_t)cache->length);
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  if (not global_join_buffer.add(size))
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  {
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    my_error(ER_OUT_OF_GLOBAL_JOINMEMORY, MYF(ME_ERROR+ME_WAITTANG));
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    return 1;
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  }
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  if (!(cache->buff= (unsigned char*) malloc(size)))
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    return 1;
 
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    return 1;                           /* Don't use cache */ /* purecov: inspected */
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  cache->end= cache->buff+size;
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  cache->reset_cache_write();
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  reset_cache_write(cache);
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  return 0;
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}
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bool JoinCache::store_record_in_cache()
 
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bool store_record_in_cache(JOIN_CACHE *cache)
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{
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  JoinCache *cache= this;
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  unsigned char *local_pos;
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  CacheField *copy,*end_field;
 
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  uint32_t length;
 
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  unsigned char *pos;
 
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  CACHE_FIELD *copy,*end_field;
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  bool last_record;
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  local_pos= cache->pos;
 
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  pos= cache->pos;
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  end_field= cache->field+cache->fields;
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  {
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    uint32_t local_length;
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    local_length= cache->length;
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    if (cache->blobs)
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    {
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      local_length+= used_blob_length(cache->blob_ptr);
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    }
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    if ((last_record= (local_length + cache->length > (size_t) (cache->end - local_pos))))
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    {
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      cache->ptr_record= cache->records;
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    }
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  }
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  length= cache->length;
 
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  if (cache->blobs)
 
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    length+= used_blob_length(cache->blob_ptr);
 
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  if ((last_record= (length + cache->length > (size_t) (cache->end - pos))))
 
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    cache->ptr_record= cache->records;
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  /*
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    There is room in cache. Put record there
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  */
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    {
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      if (last_record)
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      {
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        copy->blob_field->get_image(local_pos, copy->length+sizeof(char*), copy->blob_field->charset());
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        local_pos+= copy->length+sizeof(char*);
 
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        copy->blob_field->get_image(pos, copy->length+sizeof(char*), copy->blob_field->charset());
 
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        pos+= copy->length+sizeof(char*);
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      }
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      else
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      {
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        copy->blob_field->get_image(local_pos, copy->length, // blob length
 
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        copy->blob_field->get_image(pos, copy->length, // blob length
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                                    copy->blob_field->charset());
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        memcpy(local_pos + copy->length,copy->str,copy->blob_length);  // Blob data
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        local_pos+= copy->length+copy->blob_length;
 
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        memcpy(pos+copy->length,copy->str,copy->blob_length);  // Blob data
 
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        pos+= copy->length+copy->blob_length;
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      }
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    }
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    else
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    {
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      // SemiJoinDuplicateElimination: Get the rowid into table->ref:
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      if (copy->get_rowid)
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        copy->get_rowid->cursor->position(copy->get_rowid->getInsertRecord());
 
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        copy->get_rowid->file->position(copy->get_rowid->record[0]);
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      if (copy->strip)
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      {
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        unsigned char *str, *local_end;
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        for (str= copy->str,local_end= str+copy->length; local_end > str && local_end[-1] == ' '; local_end--) {}
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        uint32_t local_length= (uint32_t) (local_end - str);
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        memcpy(local_pos+2, str, local_length);
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        int2store(local_pos, local_length);
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        local_pos+= local_length+2;
 
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        unsigned char *str,*end;
 
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        for (str= copy->str,end= str+copy->length; end > str && end[-1] == ' '; end--)
 
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        {}
 
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        length= (uint32_t) (end-str);
 
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        memcpy(pos+2, str, length);
 
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        int2store(pos, length);
 
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        pos+= length+2;
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      }
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      else
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      {
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        memcpy(local_pos, copy->str, copy->length);
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        local_pos+= copy->length;
 
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        memcpy(pos,copy->str,copy->length);
 
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        pos+= copy->length;
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      }
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    }
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  }
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  cache->pos= local_pos;
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  return last_record || (size_t) (cache->end - local_pos) < cache->length;
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}
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void JoinCache::reset_cache_read()
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{
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  record_nr= 0;
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  pos= buff;
259
 
}
260
 
 
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void JoinCache::reset_cache_write()
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{
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  reset_cache_read();
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  records= 0;
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  ptr_record= UINT32_MAX;
 
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  cache->pos= pos;
 
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  return last_record || (size_t) (cache->end - pos) < cache->length;
 
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}
 
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void reset_cache_read(JOIN_CACHE *cache)
 
236
{
 
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  cache->record_nr= 0;
 
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  cache->pos= cache->buff;
 
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}
 
240
 
 
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void reset_cache_write(JOIN_CACHE *cache)
 
242
{
 
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  reset_cache_read(cache);
 
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  cache->records= 0;
 
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  cache->ptr_record= UINT32_MAX;
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}
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/**
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  @} (end of group Query_Optimizer)
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*/
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} /* namespace drizzled */