lighting/checkpoints: The table_info to be imported is too large lead to the err Data too long for column 'table_info' at row 1

[zimulala]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

When importing DM, the length of the table information to be imported exceeds text (65536) after parsing, resulting in the following error: [Lightning:Checkpoint:ErrInitCheckpoint]init checkpoint error: insert checkpoints failed: Error 1406 (22001): Data too long for column 'table_info' at row 1
Table field info:

tidb/br/pkg/lightning/checkpoints/checkpoints.go

Line 110 in 230e1d0

table_info text NOT NULL,

Marshal code:

tidb/br/pkg/lightning/checkpoints/checkpoints.go

Line 1253 in 230e1d0

tableInfo, err := json.Marshal(table.Desired)

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

No error.

3. What did you see instead (Required)

Error: [Lightning:Checkpoint:ErrInitCheckpoint]init checkpoint error: insert checkpoints failed: Error 1406 (22001): Data too long for column 'table_info' at row 1

4. What is your TiDB version? (Required)

v7.5.0