theta_intersection
Returns the intersection of two binary representations of Datasketches Theta Sketch objects, using a Datasketches Intersection object.
Syntax
Python
from pyspark.sql import functions as sf
sf.theta_intersection(col1, col2)
Parameters
Parameter | Type | Description |
|---|---|---|
|
| The first Theta sketch. |
|
| The second Theta sketch. |
Returns
pyspark.sql.Column: The binary representation of the intersected Theta Sketch.
Examples
Example 1: Get intersection of two Theta sketches
Python
from pyspark.sql import functions as sf
df = spark.createDataFrame([(1,1),(2,2),(3,2),(3,3)], "struct<v1:int,v2:int>")
df = df.agg(
sf.theta_sketch_agg("v1").alias("sketch1"),
sf.theta_sketch_agg("v2").alias("sketch2")
)
df.select(sf.theta_sketch_estimate(sf.theta_intersection(df.sketch1, "sketch2"))).show()
Output
+-----------------------------------------------------------+
|theta_sketch_estimate(theta_intersection(sketch1, sketch2))|
+-----------------------------------------------------------+
| 3|
+-----------------------------------------------------------+