A federation bug was identified. I have confirmed that the select where query does not work in the multi index field of some federated tables. A field in the table is used as a multi index. My server version : 10.8.2-MariaDB However, there is no problem with the server used in the previous version. The previous version is Server version: 10.5.10-MariaDB. The tested method was compared by creating a federated table on two servers with different versions. 1. 10.5.10 - MariaDB -> All queries are normally searched. 2. 10.8.2 - MariaDB -> Symptoms were confirmed in some multi index types. --> The table field datatype is (int, datetime) This is the table I created and the select query. Table Created CREATE TABLE `fd_partner_detail` ( `partner_id` varchar(100) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '파트너ID', `business_name` varchar(45) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '사업자상호명', `business_no` varchar(45) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '사업자번호', `online_marketing_business_no` varchar(45) NOT NULL DEFAULT '' COMMENT '통신판매업 신고번호', `representative` varchar(45) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '대표자명', `business_category` char(50) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '종목', `business_status` char(50) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '업종형태', `contact` varchar(45) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '연락처', `courier_code` varchar(45) NOT NULL DEFAULT '0' COMMENT '택배사코드', `postal_code` varchar(45) DEFAULT NULL COMMENT '우편번호', `address` varchar(45) DEFAULT NULL COMMENT '주소(도로명)', `address_detail` varchar(45) DEFAULT NULL COMMENT '상세주소', `officer` varchar(45) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '대표담당자명', `officer_contact` varchar(45) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '대표담당자연락처', `officer_email` varchar(45) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '대표담당자이메일', `order_officer` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '발주담당자명', `order_officer_contact` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '발주담당자연락처', `order_officer_email` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '발주담당자이메일', `calculate_order_officer` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '정산담당자명', `calculate_officer_contact` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '정산담당자연락처', `calculate_officer_email` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '정산담당자이메일', `cs_order_officer` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT 'CS담당자명', `cs_officer_contact` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT 'CS담당자연락처', `cs_officer_email` varchar(45) CHARACTER SET utf8mb3 DEFAULT '' COMMENT 'CS담당자이메일', `product_name` varchar(100) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '대표상품명', `product_url` varchar(255) CHARACTER SET utf8mb3 NOT NULL DEFAULT '' COMMENT '대표상품URL', `product_type` int(1) NOT NULL DEFAULT 0 COMMENT '대표상품제조구분 (1: 제조, 2:벤더)', `add_product_name_1` varchar(100) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '선택상품명1', `add_product_url_1` varchar(255) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '선택상품URL1', `add_product_type_1` int(1) DEFAULT 0 COMMENT '선택상품제조구분1', `add_product_name_2` varchar(100) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '선택상품명2', `add_product_url_2` varchar(255) CHARACTER SET utf8mb3 DEFAULT '' COMMENT '선택상품URL2', `add_product_type_2` int(1) DEFAULT 0 COMMENT '선택상품제조구분2', `calculate_bank_code` varchar(45) NOT NULL DEFAULT '' COMMENT '정산은행코드', `calculate_bank_no` varchar(45) NOT NULL DEFAULT '' COMMENT '정산계좌번호', `calculate_bank_name` varchar(45) NOT NULL DEFAULT '' COMMENT '정산예금주명', `file_bankbook` varchar(255) DEFAULT '' COMMENT '통장사본', `original_bankbook` varchar(255) DEFAULT '' COMMENT '통장사본원본명', `file_business_license` varchar(255) DEFAULT '' COMMENT '사업자등록증', `original_business_license` varchar(255) DEFAULT '' COMMENT '사업자등록증원본명', `file_document` varchar(255) DEFAULT '' COMMENT '기타서류', `original_document` varchar(255) DEFAULT '' COMMENT '기타서류원본명', `is_terms_service` int(1) NOT NULL DEFAULT 0 COMMENT '쇼핑몰이용약관동의여부', `is_privacy_consent` int(1) NOT NULL DEFAULT 0 COMMENT '개인정보처리방침동의여부', `join_status` int(1) NOT NULL DEFAULT 1 COMMENT '가입승인상태(1: 입점대기, 2: 입점반려, 3:입점승인, 4:입점불가)', `return_cause` text CHARACTER SET utf8mb3 DEFAULT NULL COMMENT '가입반려사유', `calculate_type` int(1) NOT NULL DEFAULT 1 COMMENT '정산주기유형(1:15일, 2:30일)', `dormant_change_date` datetime DEFAULT NULL COMMENT '휴면전환일', `dormant_cancel_date` datetime DEFAULT NULL COMMENT '휴면해제일', `join_date` datetime DEFAULT NULL COMMENT '가입승인일', `is_withdraw` int(1) NOT NULL DEFAULT 0 COMMENT '탈퇴회원여부', `introduce` text DEFAULT NULL COMMENT '회사소개', `memo` varchar(255) DEFAULT '' COMMENT '관리자 메모', `corporation_code` varchar(45) CHARACTER SET utf8mb3 NOT NULL COMMENT '회사코드', `marketplace_code` varchar(45) CHARACTER SET utf8mb3 NOT NULL COMMENT '쇼핑몰코드', `is_abolished` int(1) NOT NULL DEFAULT 0 COMMENT '삭제여부', `is_popup` int(1) DEFAULT 0 COMMENT '입점 승인', `application_code` varchar(45) CHARACTER SET utf8mb3 DEFAULT NULL COMMENT '어플리케이션코드', `created_by` varchar(45) CHARACTER SET utf8mb3 DEFAULT NULL COMMENT '생성자', `created_date` datetime DEFAULT NULL COMMENT '생성일', `modified_by` varchar(45) CHARACTER SET utf8mb3 DEFAULT NULL COMMENT '수정자', `modified_date` datetime DEFAULT NULL COMMENT '수정일', `abolished_by` varchar(45) CHARACTER SET utf8mb3 DEFAULT NULL COMMENT '삭제자', `abolished_date` datetime DEFAULT NULL COMMENT '삭제일', PRIMARY KEY (`partner_id`), KEY `IDX_R_1` (`is_abolished`), KEY `IDX_R_2` (`created_date`), KEY `IDX_U_1` (`courier_code`), KEY `IDX_U_2` (`postal_code`), KEY `IDX_U_3` (`calculate_bank_code`) ) ENGINE=FEDERATED DEFAULT CHARSET=utf8mb4 ROW_FORMAT=DYNAMIC COMMENT='파트너상세정보' CONNECTION='fdc_partner_bh/fo_partner_detail' Table Select Query SELECT business_no, representative, business_name, contact, partner_id ,is_abolished FROM fd_partner_detail WHERE created_date = '1'; Select Query Result business_no representative business_name contact partner_id is_abolished ----------- -------------- ------------- ------- ---------- -------------- I want to know if what I checked is a bug.