Package org.apache.flink.table.planner.plan.utils

Class UpsertKeyUtil

java.lang.Object

org.apache.flink.table.planner.plan.utils.UpsertKeyUtil

public class UpsertKeyUtil
extends Object

Utility for upsertKey which represented as a Set of ImmutableBitSet.

Constructor Summary

Constructors

Constructor	Description
UpsertKeyUtil()

Method Summary

Modifier and Type	Method	Description
static int[]	getSmallestKey(Set<org.apache.calcite.util.ImmutableBitSet> upsertKeys)	Returns the smallest key of given upsert keys.
static Optional<int[]>	smallestKey(Set<org.apache.calcite.util.ImmutableBitSet> upsertKeys)	Returns the smallest key of given upsert keys wrapped with a java Optional.

Methods inherited from class java.lang.Object

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

Constructor Details

UpsertKeyUtil

public UpsertKeyUtil()

Method Details

getSmallestKey

@Nonnull
public static int[] getSmallestKey(@Nullable
 Set<org.apache.calcite.util.ImmutableBitSet> upsertKeys)

Returns the smallest key of given upsert keys. The rule of 'small' is an upsert key represented by ImmutableBitSet has smaller cardinality or has a smaller leading element when the same cardinality. E.g., '{0,1}' is smaller than '{0,1,2}' and '{0,1}' is smaller than '{0,2}'.

Parameters:

upsertKeys - input upsert keys

Returns:

the smallest key

smallestKey

public static Optional<int[]> smallestKey(@Nullable
 Set<org.apache.calcite.util.ImmutableBitSet> upsertKeys)

Returns the smallest key of given upsert keys wrapped with a java Optional. Different from getSmallestKey(Set), it'll return result with an empty Optional if the input set is null or empty.