public interface StatEstimator
Modifier and Type | Method and Description |
---|---|
Optional<ColStatistics> |
estimate(List<ColStatistics> argStats)
Computes the output statistics of the actual UDF.
|
Optional<ColStatistics> estimate(List<ColStatistics> argStats)
ColStatistics
object if possible.
The actual estimation logic may decide to not give an estimation; it should return with Optional.empty()
.
Note: at the time of the call there will be ColStatistics
for all the arguments; if that is not available - the estimation is skipped.argStats
- the statistics for every argument of the UDFColStatistics
estimate for the actual UDF.Copyright © 2023 The Apache Software Foundation. All rights reserved.