Module datafusion::physical_plan::metrics

Metrics for recording information about execution

Structs

• BaselineMetrics
  Helper for creating and tracking common “baseline” metrics for each operator
• Count
  A counter to record things such as number of input or output rows
• ExecutionPlanMetricsSet
  A set of Metrics for an individual “operator” (e.g. &dyn ExecutionPlan).
• Gauge
  A gauge is the simplest metrics type. It just returns a value. For example, you can easily expose current memory consumption with a gauge.
• Label
  name=value pairs identifiying a metric. This concept is called various things in various different systems:
• Metric
  Something that tracks a value of interest (metric) of a DataFusion ExecutionPlan execution.
• MetricBuilder
  Structure for constructing metrics, counters, timers, etc.
• MetricsSet
  A snapshot of the metrics for a particular (ExecutionPlan).
• ScopedTimerGuard
  RAAI structure that adds all time between its construction and destruction to the CPU time or the first call to stop whichever comes first
• Time
  Measure a potentially non contiguous duration of time
• Timestamp
  Stores a single timestamp, stored as the number of nanoseconds elapsed from Jan 1, 1970 UTC

Enums

• MetricValue
  Possible values for a super::Metric.

Traits

• RecordOutput
  Trait for things that produce output rows as a result of execution.