org.apache.drill.common.expression.fn

Class FunctionReplacementUtils

java.lang.Object

org.apache.drill.common.expression.fn.FunctionReplacementUtils

public class FunctionReplacementUtils
extends Object

Constructor Summary

Constructors

Constructor and Description
FunctionReplacementUtils()

Method Summary

Modifier and Type	Method and Description
static String	getCastFunc(TypeProtos.MinorType targetMinorType) Given the target type, get the appropriate cast function
static String	getReplacingFunction(String functionName, TypeProtos.DataMode dataMode, TypeProtos.MinorType inputType) Get a replacing function for the original function, based on the specified data mode
static boolean	isCastFunction(String functionName) Check if a function is a cast function.
static boolean	isReplacementNeeded(String functionName, TypeProtos.MinorType inputType) Check if a replacing function is available for the the original function

Methods inherited from class java.lang.Object

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

Constructor Detail

FunctionReplacementUtils

public FunctionReplacementUtils()

Method Detail

getCastFunc

public static String getCastFunc(TypeProtos.MinorType targetMinorType)

Given the target type, get the appropriate cast function

Parameters:

targetMinorType - the target data type

Returns:

the name of cast function

getReplacingFunction

public static String getReplacingFunction(String functionName,
                                          TypeProtos.DataMode dataMode,
                                          TypeProtos.MinorType inputType)

Get a replacing function for the original function, based on the specified data mode

Parameters:

functionName - original function name

dataMode - data mode of the input data

inputType - input (minor) type

Returns:

the name of replaced function

isReplacementNeeded

public static boolean isReplacementNeeded(String functionName,
                                          TypeProtos.MinorType inputType)

Check if a replacing function is available for the the original function

Parameters:

functionName - original function name

inputType - input (minor) type

Returns:

true if replacement is needed, false otherwise

isCastFunction

public static boolean isCastFunction(String functionName)

Check if a function is a cast function.

Parameters:

functionName - name of the function

Returns:

true if function is CAST function, false otherwise