apache/flink · error · RuntimeException

Unsupported operation

Error message

Unsupported operation

What it means

This is a generic guard/sentinel error thrown from the readTimestamp methods of a ParquetDataColumnReaderFactory reader implementation. The implementation backing the column (the plain ValuesReader path, and the dictionary-backed variant) does not support reading timestamps, so calling readTimestamp()/readTimestamp(int id) on this reader is an unsupported-operation contract violation by the caller: the readVector layer invoked a timestamp read for a column whose physical Parquet type or reader factory variant cannot decode it. The faulting input is a readTimestamp call against this non-timestamp reader instance; the error carries no cause and simply fails fast instead of returning garbage.

Solutions

1. Address the cause reported by the error message: Unsupported operation
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("Unsupported operation") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Unsupported operation.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Unsupported operation.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/29f876645d0838d3. Report an issue: GitHub.

Appendix: source

Thrown at flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/vector/reader/ParquetDataColumnReaderFactory.java:110

        @Override
        public TimestampData readTimestamp() {
            throw new RuntimeException("Unsupported operation");
        }

        @Override
        public TimestampData readTimestamp(int id) {
            throw new RuntimeException("Unsupported operation");
        }

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