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As @JohnJPS mentioned, ensure that your DSN is configured to use Unicode. Are you able to narrow it down to specific records, by chance? Does the same error occur if you only write the first record? Would it be possible to post sample data (without "PII") and a workflow that reproduces the issue? I'm unable to reproduce with some Unicode data and a V_WString column type using 2018.2.5 / Redshift ODBC driver v1.04.02.1010.