apache/flink · error · RuntimeException

The quality of field type is incompatible with the request s

Error message

The quality of field type is incompatible with the request schema!

What it means

Error "The quality of field type is incompatible with the request schema!" thrown in apache/flink.

Source

Thrown at flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/ParquetVectorizedInputFormat.java:247

                    type =
                            ParquetSchemaConverter.convertToParquetType(
                                    projectedFields[i].toLowerCase(Locale.ROOT),
                                    projectedTypes[i],
                                    config);
                    unknownFieldsIndices.add(i);
                }
                // TODO clip for array,map,row types.
                types[i] = type;
            }
        }

        return Types.buildMessage().addFields(types).named("flink-parquet");
    }

    private void checkSchema(MessageType fileSchema, MessageType requestedSchema)
            throws IOException, UnsupportedOperationException {
        if (projectedFields.length != requestedSchema.getFieldCount()) {
            throw new RuntimeException(
                    "The quality of field type is incompatible with the request schema!");
        }

        /*
         * Check that the requested schema is supported.
         */
        for (int i = 0; i < requestedSchema.getFieldCount(); ++i) {
            String[] colPath = requestedSchema.getPaths().get(i);
            if (fileSchema.containsPath(colPath)) {
                ColumnDescriptor fd = fileSchema.getColumnDescription(colPath);
                if (!fd.equals(requestedSchema.getColumns().get(i))) {
                    throw new UnsupportedOperationException("Schema evolution not supported.");
                }
            } else {
                if (requestedSchema.getColumns().get(i).getMaxDefinitionLevel() == 0) {
                    // Column is missing in data but the required data is non-nullable. This file is
                    // invalid.
                    throw new IOException(

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: The quality of field type is incompatible with the request schema!
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("The quality of field type is incompatible with the request schema!") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: The quality of field type is incompatible with the request schema!.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: The quality of field type is incompatible with the request schema!.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/a06adc1e97a1c116. Report an issue: GitHub.