kll_sketch_merge_double

Merge deux tampons de croquis doubles KLL en un seul.

Syntaxe

Python

from pyspark.sql import functions as sf

sf.kll_sketch_merge_double(left, right)

parameter

parameter	Type	Description
left	pyspark.sql.Column ou str	La première double esquisse KLL.
right	pyspark.sql.Column ou str	Le 2e croquis double KLL.

parameter	Type	Description
left	pyspark.sql.Column ou str	La première double esquisse KLL.
right	pyspark.sql.Column ou str	Le 2e croquis double KLL.

Renvoie

pyspark.sql.Column: L'esquisse KLL fusionnée.

Exemples

Exemple 1 : Merge deux croquis doubles KLL

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"))
result = sketch_df.select(sf.kll_sketch_merge_double("sketch", "sketch")).first()[0]
result is not None and len(result) > 0

Output

True