Thinking Sphinx: Another index error - mysql

Question

While indexing I get this error:
indexing index 'qtl_table_core'...
ERROR: index 'qtl_table_core': sql_range_query: 'soybase.qtl_table.QTLName' isn't in GROUP BY (DSN=mysql://_www:***#xxxxxxx/soybase).
My model:
class QtlTable < ActiveRecord::Base
....
define_index do
indexes :QTLID, :sortable => true
indexes :QTLName, :sortable => true
end
development.sphinx.conf
indexer
{
}
searchd
{
listen = 127.0.0.1:1234
log = /usr/home/benjamin/qtl/log/searchd.log
query_log = /usr/home/benjamin/qtl/log/searchd.query.log
pid_file = /usr/home/benjamin/qtl/log/searchd.development.pid
}
source qtl_table_core_0
{
type = mysql
sql_host = xxxxxxxxxxxxxx
sql_user = _www
sql_pass =
sql_db = soybase
sql_query_pre = SET NAMES utf8
sql_query_pre = SET TIME_ZONE = '+0:00'
sql_query = SELECT SQL_NO_CACHE `qtl_table`.`QTLID` * CAST(1 AS SIGNED) + 0 AS `QTLID` , `qtl_table`.`QTLID` AS `QTLID`, `qtl_table`.`QTLName` AS `QTLName`, `qtl_table`.`QTLID` AS `sphinx_internal_id`, 0 AS `sphinx_deleted`, 1786069111 AS `class_crc`, IFNULL(`qtl_table`.`QTLID`, '') AS `QTLID_sort`, IFNULL(`qtl_table`.`QTLName`, '') AS `QTLName_sort` FROM `qtl_table` WHERE (`qtl_table`.`QTLID` >= $start AND `qtl_table`.`QTLID` <= $end) GROUP BY `qtl_table`.`QTLID` ORDER BY NULL
sql_query_range = SELECT IFNULL(MIN(`QTLID`), 1), IFNULL(MAX(`QTLID`), 1) FROM `qtl_table`
sql_attr_uint = sphinx_internal_id
sql_attr_uint = sphinx_deleted
sql_attr_uint = class_crc
sql_attr_str2ordinal = QTLID_sort
sql_attr_str2ordinal = QTLName_sort
sql_query_info = SELECT * FROM `qtl_table` WHERE `QTLID` = (($id - 0) / 1)
}
index qtl_table_core
{
source = qtl_table_core_0
path = /usr/home/benjamin/qtl/db/sphinx/development/qtl_table_core
charset_type = utf-8
min_infix_len = 1
enable_star = 1
}
index qtl_table
{
type = distributed
local = qtl_table_core
}

Answer 1

Try adding the following inside your define_index block:
group_by "`qtl_table`.`QTLName`"