org.apache.asterix.metadata.dataset.hints

Class DatasetHints

java.lang.Object

org.apache.asterix.metadata.dataset.hints.DatasetHints

public class DatasetHints
extends Object

Collection of hints supported by create dataset statement. Includes method to validate a hint and its associated value as provided in a create dataset statement.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	DatasetHints.DatasetCardinalityHint Hint representing the expected number of tuples in the dataset.
static class	DatasetHints.DatasetNodegroupCardinalityHint Hint representing the cardinality of nodes forming the nodegroup for the dataset.

Constructor Summary

Constructors

Constructor and Description
DatasetHints()

Method Summary

Methods

Modifier and Type	Method and Description
static org.apache.hyracks.algebricks.common.utils.Pair<Boolean,String>	validate(String hintName, String value) validate the use of a hint

Methods inherited from class java.lang.Object

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

Constructor Detail

DatasetHints

public DatasetHints()

Method Detail

validate

public static org.apache.hyracks.algebricks.common.utils.Pair<Boolean,String> validate(String hintName,
                                                                       String value)

validate the use of a hint

Parameters:

hintName - name of the hint

value - value associated with the hint

Returns:

a Pair with first element as a boolean that represents the validation result. second element as the error message if the validation result is false