load data with long content will panic

[xiongjiwei]

Bug Report

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1. Minimal reproduce step (Required)

create table ffa_order ( id SMALLINT , active TINYINT , job_number VARCHAR(100) , po_number VARCHAR(100) , client_id SMALLINT , project_id SMALLINT , job_description VARCHAR(100) , shift_duration VARCHAR(100) , start_date DATE , end_date DATE , comments TEXT , user_id SMALLINT , date_created DATETIME , modified_time DATETIME , status_id TINYINT , supplier_id TINYINT )

load data local infile 'ffa_order.csv' into table `test`.`ffa_order` columns terminated by ',' optionally enclosed by '"';

ffa_order.csv

(TL;DR: the comments field in the CSV contains 49,162 characters with new lines)

this bug is introduced by #23201

2. What did you expect to see? (Required)

3. What did you see instead (Required)

4. What is your TiDB version? (Required)

[github-actions]

Please check whether the issue should be labeled with 'affects-x.y' or 'fixes-x.y.z', and then remove 'needs-more-info' label.