apache/flink · error · RuntimeException

Unsupported type in the list:

Error message

Unsupported type in the list: 

What it means

Error "Unsupported type in the list: " thrown in apache/flink.

Source

Thrown at flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/vector/reader/NestedPrimitiveColumnReader.java:272

            case FLOAT:
                return dataColumn.readFloat();
            case DOUBLE:
                return dataColumn.readDouble();
            case DECIMAL:
                switch (descriptor.getPrimitiveType().getPrimitiveTypeName()) {
                    case INT32:
                        return dataColumn.readInteger();
                    case INT64:
                        return dataColumn.readLong();
                    case BINARY:
                    case FIXED_LEN_BYTE_ARRAY:
                        return dataColumn.readBytes();
                }
            case TIMESTAMP_WITHOUT_TIME_ZONE:
            case TIMESTAMP_WITH_LOCAL_TIME_ZONE:
                return dataColumn.readTimestamp();
            default:
                throw new RuntimeException("Unsupported type in the list: " + type);
        }
    }

    private Object dictionaryDecodeValue(LogicalType category, Integer dictionaryValue) {
        if (dictionaryValue == null) {
            return null;
        }

        switch (category.getTypeRoot()) {
            case CHAR:
            case VARCHAR:
            case BINARY:
            case VARBINARY:
                return dictionary.readBytes(dictionaryValue);
            case DATE:
            case TIME_WITHOUT_TIME_ZONE:
            case INTEGER:
                return dictionary.readInteger(dictionaryValue);

View on GitHub (pinned to 2f3c205e92)

Solutions

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

Example fix

Correct the condition described ("Unsupported type in the list:") and rerun the job or command.

When it happens

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

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

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/e6dbc3882ea76b9c. Report an issue: GitHub.