LimitSpec (druid-processing 28.0.0 API)

All Superinterfaces:

Cacheable

All Known Implementing Classes:

DefaultLimitSpec, NoopLimitSpec
```
public interface LimitSpec
extends Cacheable
```

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`com.google.common.base.Function<Sequence<ResultRow>,Sequence<ResultRow>>`	`build(GroupByQuery query)`	Returns a function that applies a limit to an input sequence that is assumed to be sorted on dimensions.
`LimitSpec`	`filterColumns(Set<String> names)`	Discard sorting columns not contained in given set.
`static LimitSpec`	`nullToNoopLimitSpec(LimitSpec limitSpec)`

Methods inherited from interface org.apache.druid.java.util.common.Cacheable
getCacheKey

- Method Detail
  - nullToNoopLimitSpec
```
static LimitSpec nullToNoopLimitSpec(@Nullable
                                     LimitSpec limitSpec)
```
  - build
```
com.google.common.base.Function<Sequence<ResultRow>,Sequence<ResultRow>> build(GroupByQuery query)
```
    Returns a function that applies a limit to an input sequence that is assumed to be sorted on dimensions.
    
    Parameters:
    
    query - the query that this limit spec belongs to
    
    Returns:
    
    limit function
  - filterColumns
```
LimitSpec filterColumns(Set<String> names)
```
    Discard sorting columns not contained in given set. This is used when generating new queries, e.g. to process subtotal spec in GroupBy query.
    
    Parameters:
    
    names - columns names to keep
    
    Returns:
    
    new LimitSpec that works with fitlered set of columns