kll_sketch_to_string_float

Returns a string with human readable summary information about the KLL float sketch.

Syntax

from pyspark.sql import functions as sf

sf.kll_sketch_to_string_float(col)

Parameters

Parameter	Type	Description
col	pyspark.sql.Column or str	The KLL float sketch binary representation.

Returns

pyspark.sql.Column: A string representation of the sketch.

Examples

Example 1: Get string representation of KLL float sketch

from pyspark.sql import functions as sf
df = spark.createDataFrame([1.0,2.0,3.0,4.0,5.0], "FLOAT")
sketch_df = df.agg(sf.kll_sketch_agg_float("value").alias("sketch"))
result = sketch_df.select(sf.kll_sketch_to_string_float("sketch")).first()[0]
"Kll" in result and "N" in result

True