org.apache.drill.exec.expr.fn

Class FunctionGenerationHelper

java.lang.Object

org.apache.drill.exec.expr.fn.FunctionGenerationHelper

public class FunctionGenerationHelper
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static String	COMPARE_TO_NULLS_HIGH
static String	COMPARE_TO_NULLS_LOW
static String	EQ
static String	GE
static String	GT
static String	LE
static String	LT
static String	NE

Constructor Summary

Constructors

Constructor and Description
FunctionGenerationHelper()

Method Summary

Methods

Modifier and Type	Method and Description
static LogicalExpression	getOrderingComparator(boolean null_high, ClassGenerator.HoldingContainer left, ClassGenerator.HoldingContainer right, FunctionLookupContext functionLookupContext) Finds ordering comparator ("compare_to...") FunctionHolderExpression with a specified ordering for NULL (and considering NULLS equal).
static LogicalExpression	getOrderingComparatorNullsHigh(ClassGenerator.HoldingContainer left, ClassGenerator.HoldingContainer right, FunctionImplementationRegistry registry) Finds ordering comparator ("compare_to...") FunctionHolderExpression with a "NULL high" ordering (and considering NULLS equal).

Methods inherited from class java.lang.Object

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

Field Detail

COMPARE_TO_NULLS_HIGH

public static final String COMPARE_TO_NULLS_HIGH

See Also:

Constant Field Values

COMPARE_TO_NULLS_LOW

public static final String COMPARE_TO_NULLS_LOW

See Also:

Constant Field Values

EQ

public static final String EQ

See Also:

Constant Field Values

NE

public static final String NE

See Also:

Constant Field Values

GT

public static final String GT

See Also:

Constant Field Values

GE

public static final String GE

See Also:

Constant Field Values

LT

public static final String LT

See Also:

Constant Field Values

LE

public static final String LE

See Also:

Constant Field Values

Constructor Detail

FunctionGenerationHelper

public FunctionGenerationHelper()

Method Detail

getOrderingComparator

public static LogicalExpression getOrderingComparator(boolean null_high,
                                      ClassGenerator.HoldingContainer left,
                                      ClassGenerator.HoldingContainer right,
                                      FunctionLookupContext functionLookupContext)

Finds ordering comparator ("compare_to...") FunctionHolderExpression with a specified ordering for NULL (and considering NULLS equal).

Parameters:

null_high - whether NULL should compare as the lowest value (if false) or the highest value (if true)

left - ...

right - ...

functionLookupContext - ...

Returns:

FunctionHolderExpression containing the found function implementation

getOrderingComparatorNullsHigh

public static LogicalExpression getOrderingComparatorNullsHigh(ClassGenerator.HoldingContainer left,
                                               ClassGenerator.HoldingContainer right,
                                               FunctionImplementationRegistry registry)

Finds ordering comparator ("compare_to...") FunctionHolderExpression with a "NULL high" ordering (and considering NULLS equal).

Parameters:

left - ...

right - ...

registry - ...

Returns:

FunctionHolderExpression containing the function implementation