org.apache.sysds.runtime.matrix.data

## Class FrameBlock

- java.lang.Object
- - org.apache.sysds.runtime.matrix.data.FrameBlock

- All Implemented Interfaces:
    Externalizable, Serializable, org.apache.hadoop.io.Writable, CacheBlock

      public class FrameBlock
      extends Object
      implements CacheBlock, Externalizable

  See Also:
    Serialized Form

- - ### Nested Class Summary

    Nested Classes
    Modifier and Type | Class and Description
    --- | ---
    `static class` | `FrameBlock.ColumnMetadata`
    `static class` | `FrameBlock.FrameMapFunction`

  - ### Field Summary

    Fields
    Modifier and Type | Field and Description
    --- | ---
    `static int` | `BUFFER_SIZE`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `FrameBlock()`
    `FrameBlock(FrameBlock that)` Copy constructor for frame blocks, which uses a shallow copy for the schema (column types and names) but a deep copy for meta data and actual column data.
    `FrameBlock(int ncols, Types.ValueType vt)`
    `FrameBlock(Types.ValueType[] schema)`
    `FrameBlock(Types.ValueType[] schema, String[] names)`
    `FrameBlock(Types.ValueType[] schema, String[][] data)`
    `FrameBlock(Types.ValueType[] schema, String[] names, String[][] data)`

  - ### Method Summary

    All Methods Static Methods Instance Methods Concrete Methods
    Modifier and Type | Method and Description
    --- | ---
    `FrameBlock` | `append(FrameBlock that, FrameBlock ret, boolean cbind)` Appends the given argument frameblock 'that' to this frameblock by creating a deep copy to prevent side effects.
    `void` | `appendColumn(boolean[] col)` Append a column of value type BOOLEAN as the last column of the data frame.
    `void` | `appendColumn(double[] col)` Append a column of value type DOUBLE as the last column of the data frame.
    `void` | `appendColumn(float[] col)` Append a column of value type float as the last column of the data frame.
    `void` | `appendColumn(int[] col)` Append a column of value type INT as the last column of the data frame.
    `void` | `appendColumn(long[] col)` Append a column of value type LONG as the last column of the data frame.
    `void` | `appendColumn(String[] col)` Append a column of value type STRING as the last column of the data frame.
    `void` | `appendColumns(double[][] cols)` Append a set of column of value type DOUBLE at the end of the frame in order to avoid repeated allocation with appendColumns.
    `void` | `appendRow(Object[] row)` Append a row to the end of the data frame, where all row fields are boxed objects according to the schema.
    `void` | `appendRow(String[] row)` Append a row to the end of the data frame, where all row fields are string encoded.
    `FrameBlock` | `binaryOperations(BinaryOperator bop, FrameBlock that, FrameBlock out)` This method performs the value comparison on two frames if the values in both frames are equal, not equal, less than, greater than, less than/greater than and equal to the output frame will store boolean value for each each comparison
    `void` | `compactEmptyBlock()` Free unnecessarily allocated empty block.
    `void` | `copy(FrameBlock src)`
    `void` | `copy(int rl, int ru, int cl, int cu, FrameBlock src)`
    `static String` | `createColName(int i)`
    `static String[]` | `createColNames(int size)`
    `static String[]` | `createColNames(int off, int size)`
    `FrameBlock` | `detectSchemaFromRow(double sampleFraction)`
    `FrameBlock` | `dropInvalidType(FrameBlock schema)` Drop the cell value which does not confirms to the data type of its column
    `void` | `ensureAllocatedColumns(int numRows)` Allocate column data structures if necessary, i.e., if schema specified but not all column data structures created yet.
    `void` | `ensureColumnCompatibility(int newlen)` Checks for matching column sizes in case of existing columns.
    `Object` | `get(int r, int c)` Gets a boxed object of the value in position (r,c).
    `org.apache.sysds.runtime.matrix.data.FrameBlock.Array` | `getColumn(int c)`
    `Object` | `getColumnData(int c)`
    `FrameBlock.ColumnMetadata[]` | `getColumnMetadata()`
    `FrameBlock.ColumnMetadata` | `getColumnMetadata(int c)`
    `String` | `getColumnName(int c)` Returns the column name for the requested column.
    `Map<String,Integer>` | `getColumnNameIDMap()` Creates a mapping from column names to column IDs, i.e., 1-based column indexes
    `String[]` | `getColumnNames()` Returns the column names of the frame block.
    `String[]` | `getColumnNames(boolean alloc)` Returns the column names of the frame block.
    `FrameBlock` | `getColumnNamesAsFrame()`
    `static FrameBlock.FrameMapFunction` | `getCompiledFunction(String lambdaExpr)`
    `DataCharacteristics` | `getDataCharacteristics()`
    `long` | `getExactSerializedSize()` Get the exact serialized size in bytes of the cache block.
    `long` | `getInMemorySize()` Get the in-memory size in bytes of the cache block.
    `int` | `getNumColumns()` Get the number of columns of the frame block, that is the number of columns defined in the schema.
    `int` | `getNumRows()` Get the number of rows of the frame block.
    `Iterator<Object[]>` | `getObjectRowIterator()` Get a row iterator over the frame where all fields are encoded as boxed objects according to their value types.
    `Iterator<Object[]>` | `getObjectRowIterator(int[] cols)` Get a row iterator over the frame where all selected fields are encoded as boxed objects according to their value types.
    `Iterator<Object[]>` | `getObjectRowIterator(int rl, int ru)` Get a row iterator over the frame where all fields are encoded as boxed objects according to their value types.
    `Iterator<Object[]>` | `getObjectRowIterator(int rl, int ru, int[] cols)` Get a row iterator over the frame where all selected fields are encoded as boxed objects according to their value types.
    `Iterator<Object[]>` | `getObjectRowIterator(Types.ValueType[] schema)` Get a row iterator over the frame where all fields are encoded as boxed objects according to the value types of the provided target schema.
    `HashMap<String,Long>` | `getRecodeMap(int col)` This function will split every Recode map in the column using delimiter Lop.DATATYPE_PREFIX, as Recode map generated earlier in the form of Code+Lop.DATATYPE_PREFIX+Token and store it in a map which contains token and code for every unique tokens.
    `Types.ValueType[]` | `getSchema()` Returns the schema of the frame block.
    `FrameBlock` | `getSchemaTypeOf()`
    `Iterator<String[]>` | `getStringRowIterator()` Get a row iterator over the frame where all fields are encoded as strings independent of their value types.
    `Iterator<String[]>` | `getStringRowIterator(int colID)` Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
    `Iterator<String[]>` | `getStringRowIterator(int[] cols)` Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
    `Iterator<String[]>` | `getStringRowIterator(int rl, int ru)` Get a row iterator over the frame where all fields are encoded as strings independent of their value types.
    `Iterator<String[]>` | `getStringRowIterator(int rl, int ru, int colID)` Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
    `Iterator<String[]>` | `getStringRowIterator(int rl, int ru, int[] cols)` Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
    `FrameBlock` | `invalidByLength(MatrixBlock feaLen)` This method validates the frame data against an attribute length constrain if data value in any cell is greater than the specified threshold of that attribute the output frame will store a null on that cell position, thus removing the length-violating values.
    `boolean` | `isColNameDefault(int i)`
    `boolean` | `isColNamesDefault()`
    `boolean` | `isColumnMetadataDefault()`
    `boolean` | `isColumnMetadataDefault(int c)`
    `boolean` | `isShallowSerialize()` Indicates if the cache block is subject to shallow serialized, which is generally true if in-memory size and serialized size are almost identical allowing to avoid unnecessary deep serialize.
    `boolean` | `isShallowSerialize(boolean inclConvert)` Indicates if the cache block is subject to shallow serialized, which is generally true if in-memory size and serialized size are almost identical allowing to avoid unnecessary deep serialize.
    `FrameBlock` | `leftIndexingOperations(FrameBlock rhsFrame, IndexRange ixrange, FrameBlock ret)`
    `FrameBlock` | `leftIndexingOperations(FrameBlock rhsFrame, int rl, int ru, int cl, int cu, FrameBlock ret)`
    `FrameBlock` | `map(FrameBlock.FrameMapFunction lambdaExpr)`
    `FrameBlock` | `map(String lambdaExpr)`
    `FrameBlock` | `mapDist(FrameBlock.FrameMapFunction lambdaExpr)`
    `void` | `mapInplace(Function<String,String> fun)`
    `void` | `merge(CacheBlock that, boolean bDummy)` Merge the given block into the current block.
    `void` | `merge(FrameBlock that)`
    `static FrameBlock` | `mergeSchema(FrameBlock temp1, FrameBlock temp2)`
    `void` | `readExternal(ObjectInput in)`
    `void` | `readFields(DataInput in)`
    `void` | `recomputeColumnCardinality()`
    `void` | `reset()`
    `void` | `reset(int nrow, boolean clearMeta)`
    `void` | `set(int r, int c, Object val)` Sets the value in position (r,c), where the input is assumed to be a boxed object consistent with the schema definition.
    `void` | `setColumn(int c, org.apache.sysds.runtime.matrix.data.FrameBlock.Array column)`
    `void` | `setColumnMetadata(FrameBlock.ColumnMetadata[] colmeta)`
    `void` | `setColumnMetadata(int c, FrameBlock.ColumnMetadata colmeta)`
    `void` | `setColumnNames(String[] colnames)`
    `void` | `setNumRows(int numRows)`
    `void` | `setSchema(Types.ValueType[] schema)` Sets the schema of the frame block.
    `void` | `slice(ArrayList<Pair<Long,FrameBlock>> outlist, IndexRange range, int rowCut)`
    `FrameBlock` | `slice(IndexRange ixrange, FrameBlock ret)`
    `FrameBlock` | `slice(int rl, int ru, int cl, int cu, CacheBlock retCache)` Right indexing operations to slice a subframe out of this frame block.
    `void` | `toShallowSerializeBlock()` Converts a cache block that is not shallow serializable into a form that is shallow serializable.
    `void` | `write(DataOutput out)`
    `void` | `writeExternal(ObjectOutput out)`
    `FrameBlock` | `zeroOutOperations(FrameBlock result, IndexRange range, boolean complementary, int iRowStartSrc, int iRowStartDest, int blen, int iMaxRowsToCopy)` This function ZERO OUT the data in the slicing window applicable for this block.

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

- - ### Field Detail

    - #### BUFFER_SIZE

          public static final int BUFFER_SIZE

      See Also:
        Constant Field Values

  - ### Constructor Detail

    - #### FrameBlock

          public FrameBlock()

    - #### FrameBlock

          public FrameBlock(FrameBlock that)

      Copy constructor for frame blocks, which uses a shallow copy for the schema (column types and names) but a deep copy for meta data and actual column data.
      Parameters:
        `that` - frame block

    - #### FrameBlock

          public FrameBlock(int ncols,
                            Types.ValueType vt)

    - #### FrameBlock

          public FrameBlock(Types.ValueType[] schema)

    - #### FrameBlock

          public FrameBlock(Types.ValueType[] schema,
                            String[] names)

    - #### FrameBlock

          public FrameBlock(Types.ValueType[] schema,
                            String[][] data)

    - #### FrameBlock

          public FrameBlock(Types.ValueType[] schema,
                            String[] names,
                            String[][] data)

  - ### Method Detail

    - #### getNumRows

          public int getNumRows()

      Get the number of rows of the frame block.
      Specified by:
        `getNumRows` in interface `CacheBlock`
      Returns:
        number of rows

    - #### setNumRows

          public void setNumRows(int numRows)

    - #### getNumColumns

          public int getNumColumns()

      Get the number of columns of the frame block, that is the number of columns defined in the schema.
      Specified by:
        `getNumColumns` in interface `CacheBlock`
      Returns:
        number of columns

    - #### getDataCharacteristics

          public DataCharacteristics getDataCharacteristics()

      Specified by:
        `getDataCharacteristics` in interface `CacheBlock`

    - #### getSchema

          public Types.ValueType[] getSchema()

      Returns the schema of the frame block.
      Returns:
        schema as array of ValueTypes

    - #### setSchema

          public void setSchema(Types.ValueType[] schema)

      Sets the schema of the frame block.
      Parameters:
        `schema` - schema as array of ValueTypes

    - #### getColumnNames

          public String[] getColumnNames()

      Returns the column names of the frame block. This method allocates default column names if required.
      Returns:
        column names

    - #### getColumnNamesAsFrame

          public FrameBlock getColumnNamesAsFrame()

    - #### getColumnNames

          public String[] getColumnNames(boolean alloc)

      Returns the column names of the frame block. This method allocates default column names if required.
      Parameters:
        `alloc` - if true, create column names
      Returns:
        array of column names

    - #### getColumnName

          public String getColumnName(int c)

      Returns the column name for the requested column. This method allocates default column names if required.
      Parameters:
        `c` - column index
      Returns:
        column name

    - #### setColumnNames

          public void setColumnNames(String[] colnames)

    - #### getColumnMetadata

          public FrameBlock.ColumnMetadata[] getColumnMetadata()

    - #### getColumnMetadata

          public FrameBlock.ColumnMetadata getColumnMetadata(int c)

    - #### isColumnMetadataDefault

          public boolean isColumnMetadataDefault()

    - #### isColumnMetadataDefault

          public boolean isColumnMetadataDefault(int c)

    - #### setColumnMetadata

          public void setColumnMetadata(FrameBlock.ColumnMetadata[] colmeta)

    - #### setColumnMetadata

          public void setColumnMetadata(int c,
                                        FrameBlock.ColumnMetadata colmeta)

    - #### getColumnNameIDMap

          public Map<String,Integer> getColumnNameIDMap()

      Creates a mapping from column names to column IDs, i.e., 1-based column indexes
      Returns:
        map of column name keys and id values

    - #### ensureAllocatedColumns

          public void ensureAllocatedColumns(int numRows)

      Allocate column data structures if necessary, i.e., if schema specified but not all column data structures created yet.
      Parameters:
        `numRows` - number of rows

    - #### ensureColumnCompatibility

          public void ensureColumnCompatibility(int newlen)

      Checks for matching column sizes in case of existing columns.
      Parameters:
        `newlen` - number of rows to compare with existing number of rows

    - #### createColNames

          public static String[] createColNames(int size)

    - #### createColNames

          public static String[] createColNames(int off,
                                                int size)

    - #### createColName

          public static String createColName(int i)

    - #### isColNamesDefault

          public boolean isColNamesDefault()

    - #### isColNameDefault

          public boolean isColNameDefault(int i)

    - #### recomputeColumnCardinality

          public void recomputeColumnCardinality()

    - #### get

          public Object get(int r,
                            int c)

      Gets a boxed object of the value in position (r,c).
      Parameters:
        `r` - row index, 0-based
        `c` - column index, 0-based
      Returns:
        object of the value at specified position

    - #### set

          public void set(int r,
                          int c,
                          Object val)

      Sets the value in position (r,c), where the input is assumed to be a boxed object consistent with the schema definition.
      Parameters:
        `r` - row index
        `c` - column index
        `val` - value to set at specified position

    - #### reset

          public void reset(int nrow,
                            boolean clearMeta)

    - #### reset

          public void reset()

    - #### appendRow

          public void appendRow(Object[] row)

      Append a row to the end of the data frame, where all row fields are boxed objects according to the schema.
      Parameters:
        `row` - array of objects

    - #### appendRow

          public void appendRow(String[] row)

      Append a row to the end of the data frame, where all row fields are string encoded.
      Parameters:
        `row` - array of strings

    - #### appendColumn

          public void appendColumn(String[] col)

      Append a column of value type STRING as the last column of the data frame. The given array is wrapped but not copied and hence might be updated in the future.
      Parameters:
        `col` - array of strings

    - #### appendColumn

          public void appendColumn(boolean[] col)

      Append a column of value type BOOLEAN as the last column of the data frame. The given array is wrapped but not copied and hence might be updated in the future.
      Parameters:
        `col` - array of booleans

    - #### appendColumn

          public void appendColumn(int[] col)

      Append a column of value type INT as the last column of the data frame. The given array is wrapped but not copied and hence might be updated in the future.
      Parameters:
        `col` - array of longs

    - #### appendColumn

          public void appendColumn(long[] col)

      Append a column of value type LONG as the last column of the data frame. The given array is wrapped but not copied and hence might be updated in the future.
      Parameters:
        `col` - array of longs

    - #### appendColumn

          public void appendColumn(float[] col)

      Append a column of value type float as the last column of the data frame. The given array is wrapped but not copied and hence might be updated in the future.
      Parameters:
        `col` - array of doubles

    - #### appendColumn

          public void appendColumn(double[] col)

      Append a column of value type DOUBLE as the last column of the data frame. The given array is wrapped but not copied and hence might be updated in the future.
      Parameters:
        `col` - array of doubles

    - #### appendColumns

          public void appendColumns(double[][] cols)

      Append a set of column of value type DOUBLE at the end of the frame in order to avoid repeated allocation with appendColumns. The given array is wrapped but not copied and hence might be updated in the future.
      Parameters:
        `cols` - 2d array of doubles

    - #### getColumnData

          public Object getColumnData(int c)

    - #### getColumn

          public org.apache.sysds.runtime.matrix.data.FrameBlock.Array getColumn(int c)

    - #### setColumn

          public void setColumn(int c,
                                org.apache.sysds.runtime.matrix.data.FrameBlock.Array column)

    - #### getStringRowIterator

          public Iterator<String[]> getStringRowIterator()

      Get a row iterator over the frame where all fields are encoded as strings independent of their value types.
      Returns:
        string array iterator

    - #### getStringRowIterator

          public Iterator<String[]> getStringRowIterator(int[] cols)

      Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
      Parameters:
        `cols` - column selection, 1-based
      Returns:
        string array iterator

    - #### getStringRowIterator

          public Iterator<String[]> getStringRowIterator(int colID)

      Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
      Parameters:
        `colID` - column selection, 1-based
      Returns:
        string array iterator

    - #### getStringRowIterator

          public Iterator<String[]> getStringRowIterator(int rl,
                                                         int ru)

      Get a row iterator over the frame where all fields are encoded as strings independent of their value types.
      Parameters:
        `rl` - lower row index
        `ru` - upper row index
      Returns:
        string array iterator

    - #### getStringRowIterator

          public Iterator<String[]> getStringRowIterator(int rl,
                                                         int ru,
                                                         int[] cols)

      Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
      Parameters:
        `rl` - lower row index
        `ru` - upper row index
        `cols` - column selection, 1-based
      Returns:
        string array iterator

    - #### getStringRowIterator

          public Iterator<String[]> getStringRowIterator(int rl,
                                                         int ru,
                                                         int colID)

      Get a row iterator over the frame where all selected fields are encoded as strings independent of their value types.
      Parameters:
        `rl` - lower row index
        `ru` - upper row index
        `colID` - columnID, 1-based
      Returns:
        string array iterator

    - #### getObjectRowIterator

          public Iterator<Object[]> getObjectRowIterator()

      Get a row iterator over the frame where all fields are encoded as boxed objects according to their value types.
      Returns:
        object array iterator

    - #### getObjectRowIterator

          public Iterator<Object[]> getObjectRowIterator(Types.ValueType[] schema)

      Get a row iterator over the frame where all fields are encoded as boxed objects according to the value types of the provided target schema.
      Parameters:
        `schema` - target schema of objects
      Returns:
        object array iterator

    - #### getObjectRowIterator

          public Iterator<Object[]> getObjectRowIterator(int[] cols)

      Get a row iterator over the frame where all selected fields are encoded as boxed objects according to their value types.
      Parameters:
        `cols` - column selection, 1-based
      Returns:
        object array iterator

    - #### getObjectRowIterator

          public Iterator<Object[]> getObjectRowIterator(int rl,
                                                         int ru)

      Get a row iterator over the frame where all fields are encoded as boxed objects according to their value types.
      Parameters:
        `rl` - lower row index
        `ru` - upper row index
      Returns:
        object array iterator

    - #### getObjectRowIterator

          public Iterator<Object[]> getObjectRowIterator(int rl,
                                                         int ru,
                                                         int[] cols)

      Get a row iterator over the frame where all selected fields are encoded as boxed objects according to their value types.
      Parameters:
        `rl` - lower row index
        `ru` - upper row index
        `cols` - column selection, 1-based
      Returns:
        object array iterator

    - #### write

          public void write(DataOutput out)
                     throws IOException

      Specified by:
        `write` in interface `org.apache.hadoop.io.Writable`
      Throws:
        `IOException`

    - #### readFields

          public void readFields(DataInput in)
                          throws IOException

      Specified by:
        `readFields` in interface `org.apache.hadoop.io.Writable`
      Throws:
        `IOException`

    - #### writeExternal

          public void writeExternal(ObjectOutput out)
                             throws IOException

      Specified by:
        `writeExternal` in interface `Externalizable`
      Throws:
        `IOException`

    - #### readExternal

          public void readExternal(ObjectInput in)
                            throws IOException

      Specified by:
        `readExternal` in interface `Externalizable`
      Throws:
        `IOException`

    - #### getInMemorySize

          public long getInMemorySize()

      Description copied from interface: `CacheBlock`
      Get the in-memory size in bytes of the cache block.
      Specified by:
        `getInMemorySize` in interface `CacheBlock`
      Returns:
        in-memory size in bytes of cache block

    - #### getExactSerializedSize

          public long getExactSerializedSize()

      Description copied from interface: `CacheBlock`
      Get the exact serialized size in bytes of the cache block.
      Specified by:
        `getExactSerializedSize` in interface `CacheBlock`
      Returns:
        exact serialized size in bytes of cache block

    - #### isShallowSerialize

          public boolean isShallowSerialize()

      Description copied from interface: `CacheBlock`
      Indicates if the cache block is subject to shallow serialized, which is generally true if in-memory size and serialized size are almost identical allowing to avoid unnecessary deep serialize.
      Specified by:
        `isShallowSerialize` in interface `CacheBlock`
      Returns:
        true if shallow serialized

    - #### isShallowSerialize

          public boolean isShallowSerialize(boolean inclConvert)

      Description copied from interface: `CacheBlock`
      Indicates if the cache block is subject to shallow serialized, which is generally true if in-memory size and serialized size are almost identical allowing to avoid unnecessary deep serialize.
      Specified by:
        `isShallowSerialize` in interface `CacheBlock`
      Parameters:
        `inclConvert` - if true report blocks as shallow serialize that are currently not amenable but can be brought into an amenable form via `toShallowSerializeBlock`.
      Returns:
        true if shallow serialized

    - #### toShallowSerializeBlock

          public void toShallowSerializeBlock()

      Description copied from interface: `CacheBlock`
      Converts a cache block that is not shallow serializable into a form that is shallow serializable. This methods has no affect if the given cache block is not amenable.
      Specified by:
        `toShallowSerializeBlock` in interface `CacheBlock`

    - #### compactEmptyBlock

          public void compactEmptyBlock()

      Description copied from interface: `CacheBlock`
      Free unnecessarily allocated empty block.
      Specified by:
        `compactEmptyBlock` in interface `CacheBlock`

    - #### binaryOperations

          public FrameBlock binaryOperations(BinaryOperator bop,
                                             FrameBlock that,
                                             FrameBlock out)

      This method performs the value comparison on two frames if the values in both frames are equal, not equal, less than, greater than, less than/greater than and equal to the output frame will store boolean value for each each comparison
      Parameters:
        `bop` - binary operator
        `that` - frame block of rhs of m * n dimensions
        `out` - output frame block
      Returns:
        a boolean frameBlock

    - #### leftIndexingOperations

          public FrameBlock leftIndexingOperations(FrameBlock rhsFrame,
                                                   IndexRange ixrange,
                                                   FrameBlock ret)

    - #### leftIndexingOperations

          public FrameBlock leftIndexingOperations(FrameBlock rhsFrame,
                                                   int rl,
                                                   int ru,
                                                   int cl,
                                                   int cu,
                                                   FrameBlock ret)

    - #### slice

          public FrameBlock slice(IndexRange ixrange,
                                  FrameBlock ret)

    - #### slice

          public FrameBlock slice(int rl,
                                  int ru,
                                  int cl,
                                  int cu,
                                  CacheBlock retCache)

      Right indexing operations to slice a subframe out of this frame block. Note that the existing column value types are preserved.
      Specified by:
        `slice` in interface `CacheBlock`
      Parameters:
        `rl` - row lower index, inclusive, 0-based
        `ru` - row upper index, inclusive, 0-based
        `cl` - column lower index, inclusive, 0-based
        `cu` - column upper index, inclusive, 0-based
        `retCache` - cache block
      Returns:
        frame block

    - #### slice

          public void slice(ArrayList<Pair<Long,FrameBlock>> outlist,
                            IndexRange range,
                            int rowCut)

    - #### append

          public FrameBlock append(FrameBlock that,
                                   FrameBlock ret,
                                   boolean cbind)

      Appends the given argument frameblock 'that' to this frameblock by creating a deep copy to prevent side effects. For cbind, the frames are appended column-wise (same number of rows), while for rbind the frames are appended row-wise (same number of columns).
      Parameters:
        `that` - frame block to append to current frame block
        `ret` - frame block to return, can be null
        `cbind` - if true, column append
      Returns:
        frame block

    - #### copy

          public void copy(FrameBlock src)

    - #### copy

          public void copy(int rl,
                           int ru,
                           int cl,
                           int cu,
                           FrameBlock src)

    - #### getRecodeMap

          public HashMap<String,Long> getRecodeMap(int col)

      This function will split every Recode map in the column using delimiter Lop.DATATYPE_PREFIX, as Recode map generated earlier in the form of Code+Lop.DATATYPE_PREFIX+Token and store it in a map which contains token and code for every unique tokens.
      Parameters:
        `col` - is the column # from frame data which contains Recode map generated earlier.
      Returns:
        map of token and code for every element in the input column of a frame containing Recode map

    - #### merge

          public void merge(CacheBlock that,
                            boolean bDummy)

      Description copied from interface: `CacheBlock`
      Merge the given block into the current block. Both blocks needs to be of equal dimensions and contain disjoint non-zero cells.
      Specified by:
        `merge` in interface `CacheBlock`
      Parameters:
        `that` - cache block
        `bDummy` - ?

    - #### merge

          public void merge(FrameBlock that)

    - #### zeroOutOperations

          public FrameBlock zeroOutOperations(FrameBlock result,
                                              IndexRange range,
                                              boolean complementary,
                                              int iRowStartSrc,
                                              int iRowStartDest,
                                              int blen,
                                              int iMaxRowsToCopy)

      This function ZERO OUT the data in the slicing window applicable for this block.
      Parameters:
        `result` - frame block
        `range` - index range
        `complementary` - ?
        `iRowStartSrc` - ?
        `iRowStartDest` - ?
        `blen` - ?
        `iMaxRowsToCopy` - ?
      Returns:
        frame block

    - #### getSchemaTypeOf

          public FrameBlock getSchemaTypeOf()

    - #### detectSchemaFromRow

          public FrameBlock detectSchemaFromRow(double sampleFraction)

    - #### dropInvalidType

          public FrameBlock dropInvalidType(FrameBlock schema)

      Drop the cell value which does not confirms to the data type of its column
      Parameters:
        `schema` - of the frame
      Returns:
        original frame where invalid values are replaced with null

    - #### invalidByLength

          public FrameBlock invalidByLength(MatrixBlock feaLen)

      This method validates the frame data against an attribute length constrain if data value in any cell is greater than the specified threshold of that attribute the output frame will store a null on that cell position, thus removing the length-violating values.
      Parameters:
        `feaLen` - vector of valid lengths
      Returns:
        FrameBlock with invalid values converted into missing values (null)

    - #### mergeSchema

          public static FrameBlock mergeSchema(FrameBlock temp1,
                                               FrameBlock temp2)

    - #### mapInplace

          public void mapInplace(Function<String,String> fun)

    - #### map

          public FrameBlock map(String lambdaExpr)

    - #### map

          public FrameBlock map(FrameBlock.FrameMapFunction lambdaExpr)

    - #### mapDist

          public FrameBlock mapDist(FrameBlock.FrameMapFunction lambdaExpr)

    - #### getCompiledFunction

          public static FrameBlock.FrameMapFunction getCompiledFunction(String lambdaExpr)

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