broadcast

Marks a DataFrame as small enough for use in broadcast joins. Supports Spark Connect.

Syntax

from pyspark.sql import functions as dbf

dbf.broadcast(df=<df>)

Parameters

Parameter	Type	Description
df	pyspark.sql.DataFrame	DataFrame to mark as ready for broadcast join.

Returns

pyspark.sql.DataFrame: DataFrame marked as ready for broadcast join.

Examples

from pyspark.sql import functions as dbf
df = spark.createDataFrame([1, 2, 3, 3, 4], "int")
df_small = spark.range(3)
df_b = dbf.broadcast(df_small)
df.join(df_b, df.value == df_small.id).show()

+-----+---+
|value| id|
+-----+---+
|    1|  1|
|    2|  2|
+-----+---+