Module accumulate

GroupsAccumulator helpers: NullState and accumulate_indices

Structs

• NullState
  Track the accumulator null state per row: if any values for that group were null and if any values have been seen at all for that group.

Functions

• accumulate
  Invokes value_fn(group_index, value) for each non null, non filtered value of value,
• accumulate_indices
  This function is called to update the accumulator state per row when the value is not needed (e.g. COUNT)
• accumulate_multiple
  Accumulates with multiple accumulate(value) columns. (e.g. corr(c1, c2))