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