error stack trace –

org.postgresql.util.PSQLException: ERROR: out of memory
274663- Detail: Cannot enlarge string buffer containing 1073741685 bytes by 203 more bytes.
274749- Where: slot "connect_prod_job_transaction", output plugin "wal2json", in the change callback, associated LSN A257/9069C888
274874- at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2412)
274969- at org.postgresql.core.v3.QueryExecutorImpl.processCopyResults(QueryExecutorImpl.java:1043)
275062- at org.postgresql.core.v3.QueryExecutorImpl.readFromCopy(QueryExecutorImpl.java:962)
275148- at org.postgresql.core.v3.CopyDualImpl.readFromCopy(CopyDualImpl.java:41)
275223- at org.postgresql.core.v3.replication.V3PGReplicationStream.receiveNextData(V3PGReplicationStream.java:145)
275332- at org.postgresql.core.v3.replication.V3PGReplicationStream.readInternal(V3PGReplicationStream.java:114)
275438- at org.postgresql.core.v3.replication.V3PGReplicationStream.read(V3PGReplicationStream.java:60)
275535- at io.debezium.connector.postgresql.connection.PostgresReplicationConnection$1.read(PostgresReplicationConnection.java:189)
275660- at io.debezium.connector.postgresql.RecordsStreamProducer.streamChanges(RecordsStreamProducer.java:119)
275765- at io.debezium.connector.postgresql.RecordsStreamProducer.lambda$start$0(RecordsStreamProducer.java:105)
275871- at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
275947- at java.util.concurrent.FutureTask.run(FutureTask.java:266)
276008- at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
276092- at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
276176- at java.lang.Thread.run(Thread.java:748)

please refer - https://github.com/eulerto/wal2json/issues/6

please look at – https://github.com/eulerto/wal2json/blob/master/wal2json.c#L118