apache/flink · error · FlinkRuntimeException

Row field does not have any children: %s.

Error message

Row field does not have any children: %s.

What it means

Error "Row field does not have any children: %s." thrown in apache/flink.

Source

Thrown at flink-formats/flink-parquet/src/main/java/org/apache/flink/formats/parquet/vector/reader/NestedColumnReader.java:124

    }

    private Tuple2<LevelDelegation, WritableColumnVector> readRow(
            ParquetGroupField field, int readNumber, ColumnVector vector, boolean inside)
            throws IOException {
        HeapRowVector heapRowVector = (HeapRowVector) vector;
        LevelDelegation levelDelegation = null;
        List<ParquetField> children = field.getChildren();
        WritableColumnVector[] childrenVectors = heapRowVector.getFields();
        WritableColumnVector[] finalChildrenVectors =
                new WritableColumnVector[childrenVectors.length];
        for (int i = 0; i < children.size(); i++) {
            Tuple2<LevelDelegation, WritableColumnVector> tuple =
                    readData(children.get(i), readNumber, childrenVectors[i], true);
            levelDelegation = tuple.f0;
            finalChildrenVectors[i] = tuple.f1;
        }
        if (levelDelegation == null) {
            throw new FlinkRuntimeException(
                    String.format("Row field does not have any children: %s.", field));
        }

        RowPosition rowPosition =
                NestedPositionUtil.calculateRowOffsets(
                        field,
                        levelDelegation.getDefinitionLevel(),
                        levelDelegation.getRepetitionLevel());

        // If row was inside the structure, then we need to renew the vector to reset the
        // capacity.
        if (inside) {
            heapRowVector =
                    new HeapRowVector(rowPosition.getPositionsCount(), finalChildrenVectors);
        } else {
            heapRowVector.setFields(finalChildrenVectors);
        }

View on GitHub (pinned to 2f3c205e92)

Solutions

1. Address the cause reported by the error message: Row field does not have any children: the reported value.
2. Verify the inputs, configuration values, and classpath/dependency setup related to this operation, then retry.

Example fix

Correct the condition described ("Row field does not have any children: the reported value.") and rerun the job or command.

When it happens

Trigger: Triggered at runtime when the operation fails because: Row field does not have any children: the reported value.

Common situations: Commonly caused by misconfiguration, missing dependencies or files, unsupported types or operations, or invalid user input leading to: Row field does not have any children: the reported value.

AI-assisted analysis of apache/flink@2f3c205e92 (2026-08-14). Data as JSON: /api/errors/0e771e79f681698c. Report an issue: GitHub.