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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