ConcatFunction (Solr 9.4.1 analytics API)

java.lang.Object
- org.apache.solr.analytics.function.mapping.ConcatFunction

```
public class ConcatFunction
extends Object
```
A concatenation mapping function, combining the string values of the given parameters. (At least 1 parameter is required)
Uses:
- If a single StringValueStream is passed in, a StringValue representing the concatenation of the values for each document is returned. No ordering is guaranteed while concatenating.
- If a StringValue and a StringValueStream are passed in, a StringValueStream representing the concatenation of the Value and each of the values of the ValueStream for a document is returned. (Or the other way, since the Value and ValueStream can be used in either order)
- If any number (more than 0) of StringValues are passed in, a StringValue representing the concatenation of all values is returned. If any values don't exist, the overall concatenation value will still exist with an empty string used for any missing values. If none of the parameter values exist, then the overall concatenation value will not exist.

Nested Class Summary

Nested Classes
Modifier and Type	Class	Description
`static class`	`ConcatFunction.SeparatedConcatFunction`	A concatenation mapping function, combining the string values of the given parameters with a given separating string.

Field Summary

Fields
Modifier and Type Field Description

static ExpressionFactory.CreatorFunction creatorFunction

static String name

Constructor Summary

Constructors
Constructor Description

ConcatFunction()

Method Summary
- Methods inherited from class java.lang.Object
  clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

name
```
public static final String name
```
See Also:

Constant Field Values

creatorFunction

public static final ExpressionFactory.CreatorFunction creatorFunction

Constructor Detail
- ConcatFunction
```
public ConcatFunction()
```