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MDEV-8954 unnecessary fetch of entire table

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Merged fix into 10.2.
This commit is contained in:
Jacob Mathew
2017-05-01 16:04:47 -07:00
parent 5ccaabe962
commit 7afcee4cf6
9 changed files with 221 additions and 0 deletions
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59
storage/spider/spd_db_mysql.cc
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@@ -9516,6 +9516,65 @@ int spider_mysql_handler::append_explain_select(
DBUG_RETURN(0);
}
/********************************************************************
* Determine whether the current query's projection list
* consists solely of the specified column.
*
* Params IN - field_index:
* Field index of the column of interest within
* its table.
*
* Returns TRUE - if the query's projection list consists
* solely of the specified column.
* FALSE - otherwise.
********************************************************************/
bool spider_mysql_handler::is_sole_projection_field( uint16 field_index )
{
// Determine whether the projection list consists solely of the field of interest
bool is_field_in_projection_list = FALSE;
TABLE* table = spider->get_table();
uint16 projection_field_count = 0;
uint16 projection_field_index;
Field** field;
DBUG_ENTER( "spider_mysql_handler::is_sole_projection_field" );
for ( field = table->field; *field ; field++ )
{
projection_field_index = ( *field )->field_index;
if ( !( minimum_select_bit_is_set( projection_field_index ) ) )
{
// Current field is not in the projection list
continue;
}
projection_field_count++;
if ( !is_field_in_projection_list )
{
if ( field_index == projection_field_index )
{
// Field of interest is in the projection list
is_field_in_projection_list = TRUE;
}
}
if ( is_field_in_projection_list && ( projection_field_count != 1 ) )
{
// Field of interest is not the sole column in the projection list
DBUG_RETURN( FALSE );
}
}
if ( is_field_in_projection_list && ( projection_field_count == 1 ) )
{
// Field of interest is the only column in the projection list
DBUG_RETURN( TRUE );
}
DBUG_RETURN( FALSE );
}
bool spider_mysql_handler::is_bulk_insert_exec_period(
bool bulk_end
) {