org.apache.hadoop.hive.ql.exec.vector.expressions
Class NullUtil

java.lang.Object
  org.apache.hadoop.hive.ql.exec.vector.expressions.NullUtil

public class NullUtil
extends Object

Utility functions to handle null propagation.

Constructor Summary

NullUtil()

Method Summary

static int	filterNulls(ColumnVector v, boolean selectedInUse, int[] sel, int n) Filter out rows with null values.
static void	initOutputNullsToFalse(ColumnVector v, boolean isRepeating, boolean selectedInUse, int[] sel, int n)
static void	propagateNullsColCol(ColumnVector inputColVector1, ColumnVector inputColVector2, ColumnVector outputColVector, int[] sel, int n, boolean selectedInUse)
static void	setNullAndDivBy0DataEntriesDouble(DoubleColumnVector v, boolean selectedInUse, int[] sel, int n, DoubleColumnVector denoms) Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for DoubleColumnVector.NULL_VALUE.
static void	setNullAndDivBy0DataEntriesDouble(DoubleColumnVector v, boolean selectedInUse, int[] sel, int n, LongColumnVector denoms) Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for DoubleColumnVector.NULL_VALUE.
static void	setNullAndDivBy0DataEntriesLong(LongColumnVector v, boolean selectedInUse, int[] sel, int n, DoubleColumnVector denoms) Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for LongColumnVector.NULL_VALUE.
static void	setNullAndDivBy0DataEntriesLong(LongColumnVector v, boolean selectedInUse, int[] sel, int n, LongColumnVector denoms) Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for LongColumnVector.NULL_VALUE.
static void	setNullDataEntriesDecimal(DecimalColumnVector v, boolean selectedInUse, int[] sel, int n) Follow the convention that null decimal values are internally set to the smallest positive value available.
static void	setNullDataEntriesDouble(DoubleColumnVector v, boolean selectedInUse, int[] sel, int n) Set the data value for all NULL entries to NaN
static void	setNullDataEntriesLong(LongColumnVector v, boolean selectedInUse, int[] sel, int n) Set the data value for all NULL entries to the designated NULL_VALUE.
static void	setNullOutputEntriesColScalar(ColumnVector v, boolean selectedInUse, int[] sel, int n)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

NullUtil

public NullUtil()

Method Detail

setNullDataEntriesLong

public static void setNullDataEntriesLong(LongColumnVector v,
                                          boolean selectedInUse,
                                          int[] sel,
                                          int n)

Set the data value for all NULL entries to the designated NULL_VALUE.

setNullOutputEntriesColScalar

public static void setNullOutputEntriesColScalar(ColumnVector v,
                                                 boolean selectedInUse,
                                                 int[] sel,
                                                 int n)

setNullDataEntriesDouble

public static void setNullDataEntriesDouble(DoubleColumnVector v,
                                            boolean selectedInUse,
                                            int[] sel,
                                            int n)

Set the data value for all NULL entries to NaN

setNullAndDivBy0DataEntriesDouble

public static void setNullAndDivBy0DataEntriesDouble(DoubleColumnVector v,
                                                     boolean selectedInUse,
                                                     int[] sel,
                                                     int n,
                                                     LongColumnVector denoms)

Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for DoubleColumnVector.NULL_VALUE.

setNullAndDivBy0DataEntriesDouble

public static void setNullAndDivBy0DataEntriesDouble(DoubleColumnVector v,
                                                     boolean selectedInUse,
                                                     int[] sel,
                                                     int n,
                                                     DoubleColumnVector denoms)

Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for DoubleColumnVector.NULL_VALUE.

setNullAndDivBy0DataEntriesLong

public static void setNullAndDivBy0DataEntriesLong(LongColumnVector v,
                                                   boolean selectedInUse,
                                                   int[] sel,
                                                   int n,
                                                   LongColumnVector denoms)

Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for LongColumnVector.NULL_VALUE.

setNullAndDivBy0DataEntriesLong

public static void setNullAndDivBy0DataEntriesLong(LongColumnVector v,
                                                   boolean selectedInUse,
                                                   int[] sel,
                                                   int n,
                                                   DoubleColumnVector denoms)

Set all the entries for which denoms array contains zeroes to NULL; sets all the data values for NULL entries for LongColumnVector.NULL_VALUE.

propagateNullsColCol

public static void propagateNullsColCol(ColumnVector inputColVector1,
                                        ColumnVector inputColVector2,
                                        ColumnVector outputColVector,
                                        int[] sel,
                                        int n,
                                        boolean selectedInUse)

setNullDataEntriesDecimal

public static void setNullDataEntriesDecimal(DecimalColumnVector v,
                                             boolean selectedInUse,
                                             int[] sel,
                                             int n)

Follow the convention that null decimal values are internally set to the smallest positive value available. Prevents accidental zero-divide later in expression evaluation.

initOutputNullsToFalse

public static void initOutputNullsToFalse(ColumnVector v,
                                          boolean isRepeating,
                                          boolean selectedInUse,
                                          int[] sel,
                                          int n)

filterNulls

public static int filterNulls(ColumnVector v,
                              boolean selectedInUse,
                              int[] sel,
                              int n)

Filter out rows with null values. Return the number of rows in the batch.