Comments - Troubleshooting Row Size Too Large Errors with InnoDB
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In our case the Solution was:
1. Export .sql file table data & structure 2. Open with your prefer text editor 3. Replace all Varchar type to text 4. Save 5. Go to your DBMS and Delete table 6. Upload or execute the new .sql query
Note: My problem started after to upgrade from MariaDB 10.1 to MariaDB 10.2