Interface BuiltInMetadata.Distribution

All Superinterfaces:
Enclosing class:

public static interface BuiltInMetadata.Distribution extends Metadata
Metadata about how a relational expression is distributed.

If you are an operator consuming a relational expression, which subset of the rows are you seeing? You might be seeing all of them (BROADCAST or SINGLETON), only those whose key column values have a particular hash code (HASH) or only those whose column values have particular values or ranges of values (RANGE).

When a relational expression is partitioned, it is often partitioned among nodes, but it may be partitioned among threads running on the same node.