Index (Flink : Table : Common 2.1.0 API)

All Known Implementing Classes:

DefaultIndex
```
@PublicEvolving
public interface Index
```
An index is a copy of selected columns of data, from a table, that is designed to enable very efficient search. An index normally includes a "key" or direct link to the original row of data from which it was copied, to allow the complete row to be retrieved efficiently.

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`String`	`asSummaryString()`	Print the index in a readable way.
`List<String>`	`getColumns()`	Get the columns of this index.
`String`	`getName()`	Get the name of this index.

- Method Detail
  - getName
```
String getName()
```
    Get the name of this index.
  - getColumns
```
List<String> getColumns()
```
    Get the columns of this index.
  - asSummaryString
```
String asSummaryString()
```
    Print the index in a readable way.