Package org.apache.druid.segment.metadata

Interface AbstractSegmentMetadataCache.ColumnTypeMergePolicy

All Known Implementing Classes:

AbstractSegmentMetadataCache.FirstTypeMergePolicy, AbstractSegmentMetadataCache.LeastRestrictiveTypeMergePolicy

Enclosing class:

AbstractSegmentMetadataCache<T extends DataSourceInformation>

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.

@FunctionalInterface
public static interface AbstractSegmentMetadataCache.ColumnTypeMergePolicy

ColumnTypeMergePolicy defines the rules of which type to use when faced with the possibility of different types for the same column from segment to segment. It is used to help compute a RowSignature for a table in Druid based on the segment metadata of all segments, merging the types of each column encountered to end up with a single type to represent it globally.

Method Summary

Modifier and Type	Method	Description
static AbstractSegmentMetadataCache.ColumnTypeMergePolicy	fromString(String type)
org.apache.druid.segment.column.ColumnType	merge(org.apache.druid.segment.column.ColumnType existingType, org.apache.druid.segment.column.ColumnType newType)

Method Detail

merge

org.apache.druid.segment.column.ColumnType merge(org.apache.druid.segment.column.ColumnType existingType,
                                                 org.apache.druid.segment.column.ColumnType newType)

fromString

static AbstractSegmentMetadataCache.ColumnTypeMergePolicy fromString(String type)