kll_sketch_get_quantile_double
Extracts a quantile value from a KLL double sketch given an input rank value. The rank can be a single value or an array.
Syntax
Python
from pyspark.sql import functions as sf
sf.kll_sketch_get_quantile_double(sketch, rank)
Parameters
Parameter | Type | Description |
|---|---|---|
|
| The KLL double sketch binary representation. |
|
| The rank value(s) to extract (between 0.0 and 1.0). |
Returns
pyspark.sql.Column: The quantile value(s).
Examples
Example 1: Get quantile from KLL double sketch
Python
from pyspark.sql import functions as sf
df = spark.createDataFrame([1.0,2.0,3.0,4.0,5.0], "DOUBLE")
sketch_df = df.agg(sf.kll_sketch_agg_double("value").alias("sketch"))
sketch_df.select(sf.kll_sketch_get_quantile_double("sketch", sf.lit(0.5))).show()
Output
+-------------------------------------------+
|kll_sketch_get_quantile_double(sketch, 0.5)|
+-------------------------------------------+
| 3.0|
+-------------------------------------------+