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

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

All Implemented Interfaces:

Serializable

Direct Known Subclasses:

FilterStringColLikeStringScalar, FilterStringColRegExpStringScalar

public abstract class AbstractFilterStringColLikeStringScalar
extends VectorExpression

An abstract class for LIKE and REGEXP expressions. LIKE and REGEXP expression share similar functions, but they have different grammars. AbstractFilterStringColLikeStringScalar class provides shared classes and methods. Each subclass handles its grammar.

See Also:

Serialized Form

Nested Class Summary

protected static class	AbstractFilterStringColLikeStringScalar.BeginChecker Matches the beginning of each string to a pattern.
static interface	AbstractFilterStringColLikeStringScalar.Checker A Checker contains a pattern and checks whether a given string matches or not.
protected static interface	AbstractFilterStringColLikeStringScalar.CheckerFactory A CheckerFactory creates checkers of its kind.
protected static class	AbstractFilterStringColLikeStringScalar.ComplexChecker Matches each string to a pattern with Java regular expression package.
protected static class	AbstractFilterStringColLikeStringScalar.EndChecker Matches the ending of each string to its pattern.
protected static class	AbstractFilterStringColLikeStringScalar.MiddleChecker Matches the middle of each string to its pattern.
protected static class	AbstractFilterStringColLikeStringScalar.NoneChecker Matches the whole string to its pattern.

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

VectorExpression.Type

Field Summary

Fields inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

childExpressions, inputTypes, outputType

Constructor Summary

AbstractFilterStringColLikeStringScalar()

AbstractFilterStringColLikeStringScalar(int colNum, String pattern)

Method Summary

void	evaluate(VectorizedRowBatch batch) This is the primary method to implement expression logic.
protected abstract List<AbstractFilterStringColLikeStringScalar.CheckerFactory>	getCheckerFactories()
int	getColNum()
VectorExpressionDescriptor.Descriptor	getDescriptor()
int	getOutputColumn() Returns the index of the output column in the array of column vectors.
String	getOutputType() Returns type of the output column.
String	getPattern()
void	setColNum(int colNum)
void	setPattern(String pattern)

Methods inherited from class org.apache.hadoop.hive.ql.exec.vector.expressions.VectorExpression

evaluateChildren, getChildExpressions, getInputTypes, setChildExpressions, setInputTypes, setOutputType, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractFilterStringColLikeStringScalar

public AbstractFilterStringColLikeStringScalar()

AbstractFilterStringColLikeStringScalar

public AbstractFilterStringColLikeStringScalar(int colNum,
                                               String pattern)

Method Detail

getCheckerFactories

protected abstract List<AbstractFilterStringColLikeStringScalar.CheckerFactory> getCheckerFactories()

evaluate

public void evaluate(VectorizedRowBatch batch)

Description copied from class: VectorExpression

This is the primary method to implement expression logic.

Specified by:

evaluate in class VectorExpression

getOutputColumn

public int getOutputColumn()

Description copied from class: VectorExpression

Returns the index of the output column in the array of column vectors. If not applicable, -1 is returned.

Specified by:

getOutputColumn in class VectorExpression

Returns:

Index of the output column

getOutputType

public String getOutputType()

Description copied from class: VectorExpression

Returns type of the output column.

Overrides:

getOutputType in class VectorExpression

getColNum

public int getColNum()

setColNum

public void setColNum(int colNum)

getPattern

public String getPattern()

setPattern

public void setPattern(String pattern)

getDescriptor

public VectorExpressionDescriptor.Descriptor getDescriptor()

Specified by:

getDescriptor in class VectorExpression