T-Digest functions
Data structures
A T-digest is a data sketch which stores approximate percentile information. The Minerva type for this data structure is called tdigest.
Functions
merge()
| Function |
Description |
Return Type |
merge(tdigest) |
Aggregates all inputs into a single tdigest. |
tdigest |
value_at_quantile()
| Function |
Description |
Return Type |
value_at_quantile(tdigest, quantile) |
Returns the approximate percentile value from the T-digest, given the number quantile between 0 and 1. |
double |
values_at_quantiles()
| Function |
Description |
Return Type |
values_at_quantiles(tdigest, quantiles) |
Returns the approximate percentile values as an array, given the input T-digest and an array of values between 0 and 1, which represent the quantiles to return. |
array |
tdigest_agg()
| Function |
Description |
Return Type |
tdigest_agg(x) |
Composes all input values of x into a tdigest. x can be of any numeric type. |
tdigest |
tdigest_agg(x, w) |
Composes all input values of x into a tdigest using the per-item weight w. w must be greater or equal than 1. x and w can be of any numeric type. |
tdigest |