org.apache.hadoop.hive.ql.parse
Class TableSample

java.lang.Object
  org.apache.hadoop.hive.ql.parse.TableSample

public class TableSample
extends Object

This class stores all the information specified in the TABLESAMPLE clause. e.g. for the clause "FROM t TABLESAMPLE(1 OUT OF 2 ON c1) it will store the numerator 1, the denominator 2 and the list of expressions(in this case c1) in the appropriate fields. The afore-mentioned sampling clause causes the 1st bucket to be picked out of the 2 buckets created by hashing on c1.

Constructor Summary

TableSample(int num, int den)

TableSample(String num, String den, ArrayList<ASTNode> exprs)
Constructs the TableSample given the numerator, denominator and the list of ON clause expressions.

Method Summary

int	getDenominator() Gets the denominator.
ArrayList<ASTNode>	getExprs() Gets the ON part's expression list.
boolean	getInputPruning() Gets the flag that indicates whether input pruning is possible.
int	getNumerator() Gets the numerator.
void	setDenominator(int den) Sets the denominator.
void	setExprs(ArrayList<ASTNode> exprs) Sets the expression list.
void	setInputPruning(boolean inputPruning) Sets the flag that indicates whether input pruning is possible or not.
void	setNumerator(int num) Sets the numerator.

Methods inherited from class java.lang.Object

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

Constructor Detail

TableSample

public TableSample(String num,
                   String den,
                   ArrayList<ASTNode> exprs)

Constructs the TableSample given the numerator, denominator and the list of ON clause expressions.

Parameters:

num - The numerator

den - The denominator

exprs - The list of expressions in the ON part of the TABLESAMPLE clause

TableSample

public TableSample(int num,
                   int den)

Method Detail

getNumerator

public int getNumerator()

Gets the numerator.

Returns:

int

setNumerator

public void setNumerator(int num)

Sets the numerator.

Parameters:

num - The numerator

getDenominator

public int getDenominator()

Gets the denominator.

Returns:

int

setDenominator

public void setDenominator(int den)

Sets the denominator.

Parameters:

den - The denominator

getExprs

public ArrayList<ASTNode> getExprs()

Gets the ON part's expression list.

Returns:

ArrayList

setExprs

public void setExprs(ArrayList<ASTNode> exprs)

Sets the expression list.

Parameters:

exprs - The expression list

getInputPruning

public boolean getInputPruning()

Gets the flag that indicates whether input pruning is possible.

Returns:

boolean

setInputPruning

public void setInputPruning(boolean inputPruning)

Sets the flag that indicates whether input pruning is possible or not.

Parameters:

inputPruning - true if input pruning is possible