I try to run a source MySQL connector on a database with large tables with many columns,

I use debezium-server with the JDBC Internal schema history store. 

There are history_data values larger than 65,000 chars, so it is split into several lines in the debezium_database_history table with column history_data_seq giving the position of each 65,000 char chunk.

So far so good, but debezium is unable to read complete history_data values: back:com.fasterxml.jackson.core.io.JsonEOFException: Unexpected end-of-input in field name

It looks like JdbcSchemaHistory.recoverRecords() does not use history_data_seq to concatenate history_data chunks.