Data Structures and Vectorization

/**
 * Base interface for columnar data access
 */
interface ColumnVector {
    /** Check if value at given row is null */
    boolean isNullAt(int rowId);
    
    /** Get number of rows in this vector */
    int getLen();
}

/** Columnar access for boolean data */
interface BooleanColumnVector extends ColumnVector {
    boolean getBoolean(int rowId);
}

/** Columnar access for integer data */
interface IntColumnVector extends ColumnVector {
    int getInt(int rowId);
}

/** Columnar access for long data */
interface LongColumnVector extends ColumnVector {
    long getLong(int rowId);
}

/** Columnar access for float data */
interface FloatColumnVector extends ColumnVector {
    float getFloat(int rowId);
}

/** Columnar access for double data */
interface DoubleColumnVector extends ColumnVector {
    double getDouble(int rowId);
}

/** Columnar access for byte array data */
interface BytesColumnVector extends ColumnVector {
    /** Get bytes data at row position */
    Bytes getBytes(int rowId);
    
    /** Inner class for byte array handling with offset and length */
    class Bytes {
        /** Byte data */
        public byte[] data;
        
        /** Offset in data array */
        public int offset;
        
        /** Length of data */
        public int len;
        
        /** Create bytes wrapper */
        Bytes(byte[] data, int offset, int len);
        
        /** Set bytes data */
        void setByteArray(byte[] data, int offset, int len);
    }
}

/** Columnar access for decimal data */
interface DecimalColumnVector extends ColumnVector {
    DecimalData getDecimal(int rowId, int precision, int scale);
}

/** Columnar access for timestamp data */
interface TimestampColumnVector extends ColumnVector {
    TimestampData getTimestamp(int rowId, int precision);
}

/** Columnar access for array data */
interface ArrayColumnVector extends ColumnVector {
    ArrayData getArray(int rowId);
}

/** Columnar access for row data */
interface RowColumnVector extends ColumnVector {
    RowData getRow(int rowId);
}

/**
 * Main class for batch columnar processing
 * Organizes multiple column vectors for efficient tabular data processing
 */
class VectorizedColumnBatch {
    /** Column vectors in this batch */
    public final ColumnVector[] columns;
    
    /** Default batch size for optimal performance */
    public static final int DEFAULT_SIZE = 2048;
    
    /**
     * Create a new vectorized column batch
     * @param vectors Array of column vectors to organize
     */
    VectorizedColumnBatch(ColumnVector[] vectors);
    
    /** Set the number of rows in this batch */
    void setNumRows(int numRows);
    
    /** Get the number of rows in this batch */
    int getNumRows();
    
    /** Get number of columns (arity) */
    int getArity();
    
    /** Check if value is null at given position */
    boolean isNullAt(int rowId, int colId);
    
    /** Get boolean value at position */
    boolean getBoolean(int rowId, int colId);
    
    /** Get byte value at position */
    byte getByte(int rowId, int colId);
    
    /** Get short value at position */
    short getShort(int rowId, int colId);
    
    /** Get integer value at position */
    int getInt(int rowId, int colId);
    
    /** Get long value at position */
    long getLong(int rowId, int colId);
    
    /** Get float value at position */
    float getFloat(int rowId, int colId);
    
    /** Get double value at position */
    double getDouble(int rowId, int colId);
    
    /** Get string value at position */
    String getString(int rowId, int colId);
    
    /** Get decimal value at position */
    DecimalData getDecimal(int rowId, int colId, int precision, int scale);
    
    /** Get timestamp value at position */
    TimestampData getTimestamp(int rowId, int colId, int precision);
    
    /** Get array value at position */
    ArrayData getArray(int rowId, int colId);
    
    /** Get row value at position */
    RowData getRow(int rowId, int colId);
}

/**
 * Base class for writable column vectors
 */
abstract class WritableColumnVector implements ColumnVector {
    /** Set null value at given row */
    void setNullAt(int rowId);
    
    /** Set not null at given row */
    void setNotNullAt(int rowId);
    
    /** Reset the vector for reuse */
    abstract void reset();
}

/** Writable boolean vector implementation */
class WritableBooleanVector extends WritableColumnVector 
    implements BooleanColumnVector {
    /** Set boolean value at given row */
    void setBoolean(int rowId, boolean value);
}

/** Writable integer vector implementation */
class WritableIntVector extends WritableColumnVector 
    implements IntColumnVector {
    /** Set integer value at given row */
    void setInt(int rowId, int value);
}

/** Writable long vector implementation */
class WritableLongVector extends WritableColumnVector 
    implements LongColumnVector {
    /** Set long value at given row */
    void setLong(int rowId, long value);
}

/** Writable float vector implementation */
class WritableFloatVector extends WritableColumnVector 
    implements FloatColumnVector {
    /** Set float value at given row */
    void setFloat(int rowId, float value);
}

/** Writable double vector implementation */
class WritableDoubleVector extends WritableColumnVector 
    implements DoubleColumnVector {
    /** Set double value at given row */
    void setDouble(int rowId, double value);
}

/** Writable byte vector implementation */
class WritableByteVector extends WritableColumnVector 
    implements ByteColumnVector {
    /** Set byte value at given row */
    void setByte(int rowId, byte value);
}

/** Writable bytes vector implementation */
class WritableBytesVector extends WritableColumnVector 
    implements BytesColumnVector {
    /** Set bytes value at given row */
    void setBytes(int rowId, byte[] value);
}

/** Writable timestamp vector implementation */
class WritableTimestampVector extends WritableColumnVector 
    implements TimestampColumnVector {
    /** Set timestamp value at given row */
    void setTimestamp(int rowId, TimestampData value);
}

/** Heap-based boolean vector */
class HeapBooleanVector extends WritableBooleanVector {
    HeapBooleanVector(int len);
}

/** Heap-based byte vector */
class HeapByteVector extends WritableByteVector {
    HeapByteVector(int len);
}

/** Heap-based integer vector */
class HeapIntVector extends WritableIntVector {
    HeapIntVector(int len);
}

/** Heap-based long vector */
class HeapLongVector extends WritableLongVector {
    HeapLongVector(int len);
}

/** Heap-based float vector */
class HeapFloatVector extends WritableFloatVector {
    HeapFloatVector(int len);
}

/** Heap-based double vector */
class HeapDoubleVector extends WritableDoubleVector {
    HeapDoubleVector(int len);
}

/** Heap-based bytes vector */
class HeapBytesVector extends WritableBytesVector {
    HeapBytesVector(int len);
}

/** Heap-based timestamp vector */
class HeapTimestampVector extends WritableTimestampVector {
    HeapTimestampVector(int len);
}

/**
 * Key interface for converting between internal and external data formats
 * Enables interoperability between Flink's internal representations and external systems
 */
interface DataStructureConverter<I, E> {
    /** Convert from internal format to external format */
    E toExternal(I internal);
    
    /** Convert from external format to internal format */
    I toInternal(E external);
}

/** Convert boolean arrays */
class ArrayBooleanArrayConverter implements DataStructureConverter<ArrayData, boolean[]> {
    ArrayBooleanArrayConverter();
}

/** Convert integer arrays */
class ArrayIntArrayConverter implements DataStructureConverter<ArrayData, int[]> {
    ArrayIntArrayConverter();
}

/** Convert long arrays */
class ArrayLongArrayConverter implements DataStructureConverter<ArrayData, long[]> {
    ArrayLongArrayConverter();
}

/** Convert float arrays */
class ArrayFloatArrayConverter implements DataStructureConverter<ArrayData, float[]> {
    ArrayFloatArrayConverter();
}

/** Convert double arrays */
class ArrayDoubleArrayConverter implements DataStructureConverter<ArrayData, double[]> {
    ArrayDoubleArrayConverter();
}

/** Convert string arrays */
class ArrayStringArrayConverter implements DataStructureConverter<ArrayData, String[]> {
    ArrayStringArrayConverter();
}

/** Convert to/from ArrayList */
class ArrayListConverter<E> implements DataStructureConverter<ArrayData, ArrayList<E>> {
    ArrayListConverter(DataStructureConverter<Object, E> elementConverter);
}

/** Convert to/from Map structures */
class MapMapConverter<K, V> implements DataStructureConverter<MapData, Map<K, V>> {
    MapMapConverter(
        DataStructureConverter<Object, K> keyConverter,
        DataStructureConverter<Object, V> valueConverter
    );
}

/** Convert date data */
class DateDateConverter implements DataStructureConverter<Integer, Date> {
    DateDateConverter();
}

/** Convert time data */
class TimeTimeConverter implements DataStructureConverter<Integer, Time> {
    TimeTimeConverter();
}

/** Convert timestamp data */
class TimestampTimestampConverter implements DataStructureConverter<TimestampData, Timestamp> {
    TimestampTimestampConverter(int precision);
}

/** Convert raw objects */
class RawObjectConverter<T> implements DataStructureConverter<RawValueData<T>, T> {
    RawObjectConverter(Class<T> clazz);
}

/** Convert structured objects */
class StructuredObjectConverter<T> implements DataStructureConverter<RowData, T> {
    StructuredObjectConverter(Class<T> clazz, LogicalType dataType);
}

/** Convert row data */
class RowRowConverter implements DataStructureConverter<RowData, Row> {
    RowRowConverter(LogicalType[] fieldTypes);
}

/** Utilities for binary row data manipulation */
class BinaryRowDataUtil {
    /** Check if two binary rows are equal */
    static boolean equals(BinaryRowData row1, BinaryRowData row2);
    
    /** Get hash code for binary row data */
    static int hashCode(BinaryRowData row);
    
    /** Copy binary row data */
    static BinaryRowData copy(BinaryRowData source);
}

/** Binary string data utilities */
class BinaryStringDataUtil {
    /** Create binary string from Java string */
    static BinaryStringData fromString(String str);
    
    /** Convert binary string to Java string */
    static String toString(BinaryStringData binaryString);
    
    /** Compare two binary strings */
    static int compare(BinaryStringData str1, BinaryStringData str2);
}

/** Interface for binary data writing */
interface BinaryWriter {
    /** Write binary data */
    void writeBytes(byte[] bytes);
    
    /** Complete the write operation */
    void complete();
}

/** Wrapper for row data with boxed primitives */
class BoxedWrapperRowData implements RowData {
    BoxedWrapperRowData(RowData row);
    
    /** Get field value as boxed primitive */
    Object get(int pos);
}

/**
 * Interface for dictionary encoding
 * Enables compressed storage of categorical data
 */
interface Dictionary {
    /** Decode dictionary encoded value */
    Object decodeToBinary(int id);
    
    /** Get the size of the dictionary */
    int size();
}

// Create column vectors
ColumnVector[] vectors = new ColumnVector[3];
vectors[0] = new HeapIntVector(1024);
vectors[1] = new HeapDoubleVector(1024);
vectors[2] = new HeapBytesVector(1024);

// Create a vectorized batch for processing
VectorizedColumnBatch batch = new VectorizedColumnBatch(vectors);

// Write data to the batch
WritableIntVector intCol = (WritableIntVector) batch.columns[0];
WritableDoubleVector doubleCol = (WritableDoubleVector) batch.columns[1];
WritableBytesVector bytesCol = (WritableBytesVector) batch.columns[2];

for (int i = 0; i < 100; i++) {
    intCol.setInt(i, i * 10);
    doubleCol.setDouble(i, i * 3.14);
    bytesCol.setBytes(i, ("value_" + i).getBytes());
}
batch.setNumRows(100);

// Read data from the batch
for (int i = 0; i < batch.getNumRows(); i++) {
    int intValue = batch.getInt(i, 0);
    double doubleValue = batch.getDouble(i, 1);
    String stringValue = batch.getString(i, 2);
}

// Convert between data formats
DataStructureConverter<ArrayData, int[]> arrayConverter = 
    new ArrayIntArrayConverter();

int[] externalArray = arrayConverter.toExternal(internalArrayData);
ArrayData internalArray = arrayConverter.toInternal(externalArray);