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Viewing changes to drizzled/opt_sum.cc

Collection of patches/bug fixes from new-cleanup tree (none of the
Table/other fixes are included).

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drizzled/opt_sum.cc
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  if (!cond)
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    return 1;
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  Field *field= field_part->field;
 
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  field->setWriteSet();
 
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  if (!(cond->used_tables() & field->table->map))
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  {
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    /* Condition doesn't restrict the used table */
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      /* Check whether the index component is partial */
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      Field *part_field= table->field[part->fieldnr-1];
 
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      part_field->setWriteSet();
 
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      if ((part_field->flags & BLOB_FLAG) ||
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          part->length < part_field->key_length())
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        break;