kll_sketch_get_quantile_bigint

Extracts a quantile value from a KLL bigint 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_bigint(sketch, rank)

Parameters

Parameter	Type	Description
sketch	pyspark.sql.Column or str	The KLL bigint sketch binary representation.
rank	pyspark.sql.Column or str	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 bigint sketch

Python

from pyspark.sql import functions as sf
df = spark.createDataFrame([1,2,3,4,5], "INT")
sketch_df = df.agg(sf.kll_sketch_agg_bigint("value").alias("sketch"))
sketch_df.select(sf.kll_sketch_get_quantile_bigint("sketch", sf.lit(0.5))).show()

Output

+-------------------------------------------+
|kll_sketch_get_quantile_bigint(sketch, 0.5)|
+-------------------------------------------+
|                                          3|
+-------------------------------------------+