seasoftさん返信ありがとうございます。
ご指摘の
SC_DB_DBFactory_MYSQLにて確認しているのですが、
意図したとおりかは、分かりませんが使用済みのcomment1を追ってcomment2を見ていったのですが、違いが無いように見受けられます。考えられる原因はどこら辺だと思いますでしょうか？
どうぞアドバイスの方お願い致します。

function viewToSubQuery() {
$sql['vw_products_allclass_detail'] =<<< __EOS__
(
SELECT
dtb_products.product_id,
dtb_products.name,
dtb_products.deliv_fee,
dtb_products.sale_limit,
dtb_products.sale_unlimited,
dtb_products.rank,
dtb_products.status,
dtb_products.product_flag,
dtb_products.point_rate,
dtb_products.comment1,
dtb_products.comment2,
dtb_products.comment3,
dtb_products.comment4,
dtb_products.comment5,
dtb_products.comment6,
dtb_products.comment7,
dtb_products.note,
dtb_products.file1,
dtb_products.file2,
dtb_products.file3,
dtb_products.file4,
dtb_products.file5,
dtb_products.file6,
dtb_products.main_list_comment,
dtb_products.main_list_image,
dtb_products.main_comment,
dtb_products.main_image,
dtb_products.main_large_image,
dtb_products.sub_title1,
dtb_products.sub_comment1,
dtb_products.sub_image1,
dtb_products.sub_large_image1,
dtb_products.sub_title2,
dtb_products.sub_comment2,
dtb_products.sub_image2,
dtb_products.sub_large_image2,
dtb_products.sub_title3,
dtb_products.sub_comment3,
dtb_products.sub_image3,
dtb_products.sub_large_image3,
dtb_products.sub_title4,
dtb_products.sub_comment4,
dtb_products.sub_image4,
dtb_products.sub_large_image4,
dtb_products.sub_title5,
dtb_products.sub_comment5,
dtb_products.sub_image5,
dtb_products.sub_large_image5,
dtb_products.sub_title6,
dtb_products.sub_comment6,
dtb_products.sub_image6,
dtb_products.sub_large_image6,
dtb_products.del_flg,
dtb_products.creator_id,
dtb_products.create_date,
dtb_products.update_date,
dtb_products.deliv_date_id,
T4.product_code_min,
T4.product_code_max,
T4.price01_min,
T4.price01_max,
T4.price02_min,
T4.price02_max,
T4.stock_min,
T4.stock_max,
T4.stock_unlimited_min,
T4.stock_unlimited_max,
T4.class_count
FROM
dtb_products
LEFT JOIN
(
SELECT
product_id,
MIN(product_code) AS product_code_min,
MAX(product_code) AS product_code_max,
MIN(price01) AS price01_min,
MAX(price01) AS price01_max,
MIN(price02) AS price02_min,
MAX(price02) AS price02_max,
MIN(stock) AS stock_min,
MAX(stock) AS stock_max,
MIN(stock_unlimited) AS stock_unlimited_min,
MAX(stock_unlimited) AS stock_unlimited_max,
COUNT(*) as class_count
FROM dtb_products_class
GROUP BY product_id
) AS T4
ON dtb_products.product_id = T4.product_id
)
__EOS__;

return array(
"vw_cross_class" => '
(SELECT T1.class_id AS class_id1, T2.class_id AS class_id2, T1.classcategory_id AS classcategory_id1, T2.classcategory_id AS classcategory_id2, T1.name AS name1, T2.name AS name2, T1.rank AS rank1, T2.rank AS rank2
FROM dtb_classcategory AS T1, dtb_classcategory AS T2 ) ',

"vw_cross_products_class" =>'
(SELECT T1.class_id1, T1.class_id2, T1.classcategory_id1, T1.classcategory_id2, T2.product_id,
T1.name1, T1.name2, T2.product_code, T2.stock, T2.price01, T2.price02, T1.rank1, T1.rank2
FROM (SELECT T1.class_id AS class_id1, T2.class_id AS class_id2, T1.classcategory_id AS classcategory_id1, T2.classcategory_id AS classcategory_id2, T1.name AS name1, T2.name AS name2, T1.rank AS rank1, T2.rank AS rank2
FROM dtb_classcategory AS T1, dtb_classcategory AS T2 ) AS T1 LEFT JOIN dtb_products_class AS T2
ON T1.classcategory_id1 = T2.classcategory_id1 AND T1.classcategory_id2 = T2.classcategory_id2) ',

"vw_products_nonclass" => '
(SELECT
T1.product_id,
T1.name,
T1.deliv_fee,
T1.sale_limit,
T1.sale_unlimited,
T1.category_id,
T1.rank,
T1.status,
T1.product_flag,
T1.point_rate,
T1.comment1,
T1.comment2,
T1.comment3,
T1.comment4,
T1.comment5,
T1.comment6,
T1.file1,
T1.file2,
T1.file3,
T1.file4,
T1.file5,
T1.file6,
T1.main_list_comment,
T1.main_list_image,
T1.main_comment,
T1.main_image,
T1.main_large_image,
T1.sub_title1,
T1.sub_comment1,
T1.sub_image1,
T1.sub_large_image1,
T1.sub_title2,
T1.sub_comment2,
T1.sub_image2,
T1.sub_large_image2,
T1.sub_title3,
T1.sub_comment3,
T1.sub_image3,
T1.sub_large_image3,
T1.sub_title4,
T1.sub_comment4,
T1.sub_image4,
T1.sub_large_image4,
T1.sub_title5,
T1.sub_comment5,
T1.sub_image5,
T1.sub_large_image5,
T1.sub_title6,
T1.sub_comment6,
T1.sub_image6,
T1.sub_large_image6,
T1.del_flg,
T1.creator_id,
T1.create_date,
T1.update_date,
T1.note,
T1.deliv_date_id,
T2.product_id_sub,
T2.product_code,
T2.price01,
T2.price02,
T2.stock,
T2.stock_unlimited,
T2.classcategory_id1,
T2.classcategory_id2
FROM (SELECT * FROM dtb_products &&noncls_where&&) AS T1 LEFT JOIN
(SELECT
product_id AS product_id_sub,
product_code,
price01,
price02,
stock,
stock_unlimited,
classcategory_id1,
classcategory_id2
FROM dtb_products_class WHERE classcategory_id1 = 0 AND classcategory_id2 = 0)
AS T2
ON T1.product_id = T2.product_id_sub) ',

"vw_products_allclass" => "
(
SELECT
alldtl.*,
dtb_category.rank AS category_rank,
T2.category_id,
T2.rank AS product_rank
FROM
{$sql['vw_products_allclass_detail']} AS alldtl
LEFT JOIN
dtb_product_categories AS T2
ON alldtl.product_id = T2.product_id
LEFT JOIN
dtb_category
ON T2.category_id = dtb_category.category_id
) ",

"vw_products_allclass_detail" => $sql['vw_products_allclass_detail'],

"vw_product_class" => '
(SELECT * FROM
(SELECT T3.product_class_id, T3.product_id AS product_id_sub, classcategory_id1, classcategory_id2,
T3.rank AS rank1, T4.rank AS rank2, T3.class_id AS class_id1, T4.class_id AS class_id2,
stock, price01, price02, stock_unlimited, product_code, T3.comment2
FROM ( SELECT
T1.product_class_id,
T1.product_id,
classcategory_id1,
classcategory_id2,
T2.rank,
T2.class_id,
stock,
price01,
price02,
stock_unlimited,
product_code
T3.comment2
FROM (dtb_products_class AS T1 LEFT JOIN dtb_classcategory AS T2
ON T1.classcategory_id1 = T2.classcategory_id))
AS T3 LEFT JOIN dtb_classcategory AS T4
ON T3.classcategory_id2 = T4.classcategory_id) AS T5 LEFT JOIN dtb_products AS T6
ON product_id_sub = T6.product_id) ',

"vw_category_count" => '
(SELECT T1.category_id, T1.category_name, T1.parent_category_id, T1.level, T1.rank, T2.product_count
FROM dtb_category AS T1 LEFT JOIN dtb_category_total_count AS T2
ON T1.category_id = T2.category_id) '
);
}
}