Package org.apache.druid.query.rowsandcols.column

Interface ColumnAccessor

All Known Subinterfaces:
BinarySearchableAccessor
All Known Implementing Classes:
DoubleColumnAccessorBase, FloatColumnAccessorBase, LongColumnAccessorBase, NullColumn.Accessor, NumericArrayFrameColumnReader.NumericArrayFrameColumn, ObjectColumnAccessorBase, ShiftedColumnAccessorBase
public interface ColumnAccessor
Allows for accessing a column, provides methods to enable row-by-row access of a specific column.

  • Method Summary

    Modifier and Type
    Method
    Description
    int
    compareRows(int lhsRowNum, int rhsRowNum)
    Compares two rows using a comparison that follows the same semantics as Comparator.compare(T, T)
    double
    getDouble(int rowNum)
    Get the primitive double representation of the row.
    float
    getFloat(int rowNum)
    Get the primitive float representation of the row.
    int
    getInt(int rowNum)
    Get the primitive int representation of the row.
    long
    getLong(int rowNum)
    Get the primitive long representation of the row.
    Object
    getObject(int rowNum)
    Get the Object representation of the row.
    ColumnType
    getType()
    Get the type of the Column
    boolean
    isNull(int rowNum)
    Get whether the value of a row is null
    int
    numRows()
    Get the number of rows

  • Method Details

    • getType

      ColumnType getType()
      Get the type of the Column
      Returns:
      the type of the Column

    • numRows

      int numRows()
      Get the number of rows
      Returns:
      the number of rows

    • isNull

      boolean isNull(int rowNum)
      Get whether the value of a row is null
      Parameters:
      rowNum - the row id, 0-indexed
      Returns:
      true if the value is null

    • getObject

      @Nullable Object getObject(int rowNum)
      Get the Object representation of the row.
      Parameters:
      rowNum - the row id, 0-indexed
      Returns:
      the Object representation of the row. Returns null If isNull(int) is true.

    • getDouble

      double getDouble(int rowNum)
      Get the primitive double representation of the row.
      Parameters:
      rowNum - the row id, 0-indexed
      Returns:
      the primitive double representation of the row. Returns 0D If isNull(int) is true.

    • getFloat

      float getFloat(int rowNum)
      Get the primitive float representation of the row.
      Parameters:
      rowNum - the row id, 0-indexed
      Returns:
      the primitive float representation of the row. Returns 0F If isNull(int) is true.

    • getLong

      long getLong(int rowNum)
      Get the primitive long representation of the row.
      Parameters:
      rowNum - the row id, 0-indexed
      Returns:
      the primitive long representation of the row. Returns 0L If isNull(int) is true.

    • getInt

      int getInt(int rowNum)
      Get the primitive int representation of the row.
      Parameters:
      rowNum - the row id, 0-indexed
      Returns:
      the primitive int representation of the row. Returns 0 If isNull(int) is true.

    • compareRows

      int compareRows(int lhsRowNum, int rhsRowNum)
      Compares two rows using a comparison that follows the same semantics as Comparator.compare(T, T)

      This is not comparing the row Ids, but the values referred to by the row ids.

      Parameters:
      lhsRowNum - the row id of the left-hand-side of the comparison
      rhsRowNum - the row id of the right-hand-side of the comparison
      Returns:
      the result of the comparison of the two rows