Interface BuiltInMetadata.Distribution

  • All Superinterfaces:
    All Known Subinterfaces:
    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.