Module com.darkcollective.relix.plan
Package com.darkcollective.relix.plan

Record Class PhysicalNode.Aggregate

java.lang.Object
java.lang.Record
com.darkcollective.relix.plan.PhysicalNode.Aggregate
All Implemented Interfaces:
PhysicalNode
Enclosing interface:
PhysicalNode
public static record PhysicalNode.Aggregate(Schema schema, List<GroupingKey> groupingKeys, List<AggregateFunction> aggregates, boolean streaming, PhysicalNode input) extends Record implements PhysicalNode
Aggregation (γ) — groups by groupingKeys and reduces each group with aggregates. When streaming is set the planner has proven the input delivers an ordering grouping the rows by the grouping keys, so the executor aggregates in a single linear pass holding only one group at a time instead of building a full hash index; otherwise it falls back to the hash-grouped aggregate.

  • Constructor Details

    • Aggregate

      public Aggregate(Schema schema, List<GroupingKey> groupingKeys, List<AggregateFunction> aggregates, boolean streaming, PhysicalNode input)
      Creates an instance of a Aggregate record class.
      Parameters:
      schema - the value for the schema record component
      groupingKeys - the value for the groupingKeys record component
      aggregates - the value for the aggregates record component
      streaming - the value for the streaming record component
      input - the value for the input record component

  • Method Details

    • children

      public List<PhysicalNode> children()
      Description copied from interface: PhysicalNode
      Direct child plans, left-to-right; empty for a PhysicalNode.Scan.
      Specified by:
      children in interface PhysicalNode

    • deliveredOrdering

      public Ordering deliveredOrdering()
      A streaming γ emits one row per group in the order the groups arrive — i.e. by the input's leading keys, which (by the streaming gate) are exactly the grouping keys. Those grouping-key columns survive into the output, so the delivered ordering is that grouping-key prefix of the input's ordering; a downstream merge join or streaming δ/γ can reuse it. A hash-grouped γ buffers and emits in unspecified order, so it delivers Ordering.none().
      Specified by:
      deliveredOrdering in interface PhysicalNode
      Returns:
      the delivered ordering; never null

    • toString

      public final String toString()
      Returns a string representation of this record class. The representation contains the name of the class, followed by the name and value of each of the record components.
      Specified by:
      toString in class Record
      Returns:
      a string representation of this object

    • hashCode

      public final int hashCode()
      Returns a hash code value for this object. The value is derived from the hash code of each of the record components.
      Specified by:
      hashCode in class Record
      Returns:
      a hash code value for this object

    • equals

      public final boolean equals(Object o)
      Indicates whether some other object is "equal to" this one. The objects are equal if the other object is of the same class and if all the record components are equal. Reference components are compared with Objects::equals(Object,Object); primitive components are compared with '=='.
      Specified by:
      equals in class Record
      Parameters:
      o - the object with which to compare
      Returns:
      true if this object is the same as the o argument; false otherwise.

    • schema

      public Schema schema()
      Returns the value of the schema record component.
      Specified by:
      schema in interface PhysicalNode
      Returns:
      the value of the schema record component

    • groupingKeys

      public List<GroupingKey> groupingKeys()
      Returns the value of the groupingKeys record component.
      Returns:
      the value of the groupingKeys record component

    • aggregates

      public List<AggregateFunction> aggregates()
      Returns the value of the aggregates record component.
      Returns:
      the value of the aggregates record component

    • streaming

      public boolean streaming()
      Returns the value of the streaming record component.
      Returns:
      the value of the streaming record component

    • input

      public PhysicalNode input()
      Returns the value of the input record component.
      Returns:
      the value of the input record component