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

Record Class PhysicalNode.Downsample

java.lang.Object
java.lang.Record
com.darkcollective.relix.plan.PhysicalNode.Downsample
Record Components:
timestampColumn - the column holding the row's timestamp
intervalSeconds - bucket width in seconds
function - how to consolidate each numeric column
groupingKeys - additional grouping keys (may be empty)
maxRows - optional limit on the most-recent buckets to emit
All Implemented Interfaces:
PhysicalNode
Enclosing interface:
PhysicalNode
public static record PhysicalNode.Downsample(Schema schema, String timestampColumn, long intervalSeconds, ConsolidationFunction function, List<String> groupingKeys, OptionalLong maxRows, PhysicalNode input) extends Record implements PhysicalNode
Time-series downsampling (DOWNSAMPLE): groups input rows into fixed-width time buckets and consolidates numeric columns using the chosen ConsolidationFunction. Output schema is the grouping keys + bucket:TIMESTAMP + one column per numeric non-key column named <fn>_<col> (or just count for COUNT).

  • Constructor Details

    • Downsample

      public Downsample(Schema schema, String timestampColumn, long intervalSeconds, ConsolidationFunction function, List<String> groupingKeys, OptionalLong maxRows, PhysicalNode input)
      Creates an instance of a Downsample record class.
      Parameters:
      schema - the value for the schema record component
      timestampColumn - the value for the timestampColumn record component
      intervalSeconds - the value for the intervalSeconds record component
      function - the value for the function record component
      groupingKeys - the value for the groupingKeys record component
      maxRows - the value for the maxRows 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

    • 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

    • timestampColumn

      public String timestampColumn()
      Returns the value of the timestampColumn record component.
      Returns:
      the value of the timestampColumn record component

    • intervalSeconds

      public long intervalSeconds()
      Returns the value of the intervalSeconds record component.
      Returns:
      the value of the intervalSeconds record component

    • function

      public ConsolidationFunction function()
      Returns the value of the function record component.
      Returns:
      the value of the function record component

    • groupingKeys

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

    • maxRows

      public OptionalLong maxRows()
      Returns the value of the maxRows record component.
      Returns:
      the value of the maxRows record component

    • input

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