Module nth_value

Defines NTH_VALUE aggregate expression which may specify ordering requirement that can evaluated at runtime during query execution

Structs

• NthValueAccumulator
• NthValueAgg
  Expression for a NTH_VALUE(... ORDER BY ..., ...) aggregation. In a multi partition setting, partial aggregations are computed for every partition, and then their results are merged.

Functions

• nth_value
  Returns the nth value in a group of values.
• nth_value_udaf
  AggregateFunction that returns a AggregateUDF for NthValueAgg