Module first_last

Defines the FIRST_VALUE/LAST_VALUE aggregations.

Structs

• FirstValue
• FirstValueAccumulator
• LastValue

Functions

• first_value
  Returns the first value in a group of values.
• first_value_udaf
  AggregateFunction that returns a AggregateUDF for FirstValue
• last_value
  Returns the last value in a group of values.
• last_value_udaf
  AggregateFunction that returns a AggregateUDF for LastValue