com.exasol.sql.expression.function.exasol

Class ExasolUdf

java.lang.Object

com.exasol.util.AbstractTreeNode

com.exasol.sql.expression.function.AbstractFunction

com.exasol.sql.expression.function.exasol.ExasolUdf

All Implemented Interfaces:

Function, ValueExpression, TreeNode

public class ExasolUdf
extends AbstractFunction

This class represents a User Defined Function in the Exasol database.

Field Summary

Fields inherited from class com.exasol.sql.expression.function.AbstractFunction

functionName, valueExpressions

Method Summary

Modifier and Type	Method and Description
void	accept(ValueExpressionVisitor visitor) Accept a visitor
Optional<ColumnsDefinition>	getEmitsColumnsDefinition() Get a columns definition for the EMITS.
boolean	hasEmitsColumnsDefinition() Check if the EMITS part is required.
boolean	hasParenthesis() Check if function needs parenthesis.
static ExasolUdf	of(String functionName, ColumnsDefinition emitsColumnsDefinition, ValueExpression... valueExpressions) Create a new ExasolUdf instance.
static ExasolUdf	of(String functionName, ValueExpression... valueExpressions) Create a new ExasolUdf instance.

Methods inherited from class com.exasol.sql.expression.function.AbstractFunction

getFunctionName

Methods inherited from class com.exasol.util.AbstractTreeNode

addChild, getChild, getChildren, getParent, getRoot, isChild, isFirstSibling, isRoot, isSibling, setParent

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.exasol.util.TreeNode

addChild, getChild, getChildren, getParent, getRoot, isChild, isFirstSibling, isRoot, isSibling, setParent

Method Detail

of

public static ExasolUdf of(String functionName,
                           ColumnsDefinition emitsColumnsDefinition,
                           ValueExpression... valueExpressions)

Create a new ExasolUdf instance.

Parameters:

functionName - name of the function

emitsColumnsDefinition - column definitions for emits

valueExpressions - zero or more value expressions

Returns:

new ExasolUdf

of

public static ExasolUdf of(String functionName,
                           ValueExpression... valueExpressions)

Create a new ExasolUdf instance.

Parameters:

functionName - name of the function

valueExpressions - zero or more value expressions

Returns:

new ExasolUdf

hasParenthesis

public boolean hasParenthesis()

Description copied from interface: Function

Check if function needs parenthesis.

Returns:

true if function has parenthesis with parameters

hasEmitsColumnsDefinition

public boolean hasEmitsColumnsDefinition()

Check if the EMITS part is required.

Returns:

true if the EMITS part is required

getEmitsColumnsDefinition

public Optional<ColumnsDefinition> getEmitsColumnsDefinition()

Get a columns definition for the EMITS.

Returns:

optional of ColumnsDefinition

accept

public void accept(ValueExpressionVisitor visitor)

Description copied from interface: ValueExpression

Accept a visitor

Parameters:

visitor - visitor to accept