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

Interface FlinkMetadata.FlinkDistribution

All Superinterfaces:
org.apache.calcite.rel.metadata.Metadata
Enclosing class:
FlinkMetadata
public static interface FlinkMetadata.FlinkDistribution extends org.apache.calcite.rel.metadata.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.

  • Nested Class Summary

    Nested Classes
    Modifier and Type
    Interface
    Description
    static interface 
    FlinkMetadata.FlinkDistribution.Handler
    Handler API.

  • Field Summary

    Fields
    Modifier and Type
    Field
    Description
    static final org.apache.calcite.rel.metadata.MetadataDef<FlinkMetadata.FlinkDistribution>
    DEF
     
    static final Method
    METHOD
     

  • Method Summary

    Modifier and Type
    Method
    Description
    FlinkRelDistribution
    flinkDistribution()
    Determines how the rows are distributed.

    Methods inherited from interface org.apache.calcite.rel.metadata.Metadata

    rel

  • Field Details

  • Method Details

    • flinkDistribution

      FlinkRelDistribution flinkDistribution()
      Determines how the rows are distributed.