kll_sketch_merge_float
Merges two KLL float sketch buffers together into one.
Syntax
Python
from pyspark.sql import functions as sf
sf.kll_sketch_merge_float(left, right)
Parameters
Parameter | Type | Description |
|---|---|---|
|
| The first KLL float sketch. |
|
| The second KLL float sketch. |
Returns
pyspark.sql.Column: The merged KLL sketch.
Examples
Example 1: Merge two KLL float sketches
Python
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_merge_float("sketch", "sketch")).first()[0]
result is not None and len(result) > 0
Output
True