fix(load): fix mysqld crash when columns contains double enclosed cha…

…r. (stoneatom#1263)

[summary]
1. crash reason is the loader column number each time is not 65535 but report 65535;
   occurs when using limit clause or duplicate key;
2. support double enclosed char, ref:https://dev.mysql.com/doc/refman/5.7/en/load-data.html

mysql-test/suite/tianmu/r/issue1263.result

@@ -0,0 +1,84 @@
+DROP DATABASE IF EXISTS issue1263_test;
+CREATE DATABASE issue1263_test;
+USE issue1263_test;
+#
+# load data exceeding  65553 rows with duplicate key
+#
+CREATE TABLE AD_PINSTANCE_LOG_P(ID bigint, PRIMARY KEY (ID)) ENGINE=tianmu;
+load data infile 'MYSQL_TEST_DIR/suite/tianmu/std_data/issue1263-1.txt' into table AD_PINSTANCE_LOG_P
+FIELDS TERMINATED BY ',' 
+ENCLOSED BY '"' 
+LINES TERMINATED BY '\n'
+(@ID)
+set
+ID=NULLif(@ID,'')
+;
+select count(*) from AD_PINSTANCE_LOG_P;
+count(*)
+65542
+#
+# load data exceeding  65553 rows with limit lines clause
+#
+CREATE TABLE AD_PINSTANCE_LOG(ID bigint) ENGINE=tianmu;
+load data infile 'MYSQL_TEST_DIR/suite/tianmu/std_data/issue1263-1.txt' into table AD_PINSTANCE_LOG
+FIELDS TERMINATED BY ',' 
+ENCLOSED BY '"' 
+LINES TERMINATED BY '\n'
+IGNORE 30 LINES
+(@ID)
+set
+ID=NULLif(@ID,'')
+;
+select count(*) from AD_PINSTANCE_LOG;
+count(*)
+65513
+#
+# load data whose columns contains double enclosed char
+#
+CREATE TABLE AD_PINSTANCE_LOG_DOUBLE_ENCLOSED(ID bigint ,
+AD_CLIENT_ID bigint, 
+AD_ORG_ID bigint, 
+AD_PINSTANCE_ID bigint, 
+P_DATE DATETIME DEFAULT null, 
+P_MSG VARCHAR(255), 
+OWNERID bigint, 
+MODIFIERID bigint, 
+CREATIONDATE DATETIME, 
+MODIFIEDDATE DATETIME, 
+ISACTIVE CHAR(1) DEFAULT 'Y' NOT NULL, 
+PRIMARY KEY (ID)) engine=tianmu;
+load data infile 'MYSQL_TEST_DIR/suite/tianmu/std_data/issue1263-2.txt' into table AD_PINSTANCE_LOG_DOUBLE_ENCLOSED
+FIELDS TERMINATED BY ',' 
+ENCLOSED BY '"' 
+LINES TERMINATED BY '\n'
+(
+@ID,
+@AD_CLIENT_ID,
+@AD_ORG_ID,
+@AD_PINSTANCE_ID,
+@P_DATE,
+@P_MSG,
+@OWNERID,
+@MODIFIERID,
+@CREATIONDATE,
+@MODIFIEDDATE,
+@ISACTIVE
+)
+set
+ID=NULLif(@ID,''),
+AD_CLIENT_ID=NULLif(@AD_CLIENT_ID,''),
+AD_ORG_ID=NULLif(@AD_ORG_ID,''),
+AD_PINSTANCE_ID=NULLif(@AD_PINSTANCE_ID,''),
+P_DATE=NULLif(@P_DATE,''),
+P_MSG=NULLif(@P_MSG,''),
+OWNERID=NULLif(@OWNERID,''),
+MODIFIERID=NULLif(@MODIFIERID,''),
+CREATIONDATE=NULLif(@CREATIONDATE,''),
+MODIFIEDDATE=NULLif(@MODIFIEDDATE,''),
+ISACTIVE=NULLif(@ISACTIVE,'')
+;
+select * from AD_PINSTANCE_LOG_DOUBLE_ENCLOSED;
+ID	AD_CLIENT_ID	AD_ORG_ID	AD_PINSTANCE_ID	P_DATE	P_MSG	OWNERID	MODIFIERID	CREATIONDATE	MODIFIEDDATE	ISACTIVE
+765893	37	27	44221	2021-06-28 02:01:16	计算售罄率出错：ORA-04036: PGA memory used by the instance exceeds PGA_AGGREGATE_LIMITORA-06512: at "BOSNDS3.O2O_STORESALERATE_SET", line 49
+	893	893	2021-06-28 02:01:10	2021-06-28 02:01:10	Y
+DROP DATABASE issue1263_test;