MySQL server has gone away
SELECT pot.*, povt.*, v.option_value_ru as variantName FROM SC_product_options_values as povt LEFT JOIN SC_products_opt_val_variants as v ON v.variantID=povt.variantID LEFT JOIN SC_product_options as pot ON pot.optionID=povt.optionID WHERE povt.productID IN ('29558') GROUP BY povt.optionID ORDER BY pot.sort_order, pot.name_ru