Databricks-Certified-Associate-Developer-for-Apache-Spark-3.0 Exam Dumps : Databricks Certified Associate Developer for Apache Spark 3.0 Exam

Explanation

Result of correct code block:

+-------------------+

|attributes_exploded|

+-------------------+

| winter|

| cooling|

+-------------------+

To solve this question, you need to know about explode(). This operation helps you to split up arrays into single rows. If you did not have a chance to familiarize yourself with this method yet, find

more examples in the documentation (link below).

Note that explode() is a method made available through pyspark.sql.functions – it is not available as a method of a DataFrame or a Column, as written in some of the answer options.

More info: pyspark.sql.functions.explode — PySpark 3.1.2 documentation

Static notebook | Dynamic notebook: See test 2, QUESTION NO: 18 (Databricks import instructions)

Static notebook | Dynamic notebook: See test 1, QUESTION NO: 23 (Databricks import instructions) ,

Explanation

spark.read.json(filePath)

Correct. spark.read accesses Spark's DataFrameReader. Then, Spark identifies the file type to be read as JSON type by passing filePath into the DataFrameReader.json() method.

spark.read.path(filePath)

Incorrect. Spark's DataFrameReader does not have a path method. A universal way to read in files is provided by the DataFrameReader.load() method (link below).

spark.read.path(filePath, source="json")

Wrong. A DataFrameReader.path() method does not exist (see above).

spark.read().json(filePath)

Incorrect. spark.read is a way to access Spark's DataFrameReader. However, the DataFrameReader is not callable, so calling it via spark.read() will fail.

spark.read().path(filePath)

No, Spark's DataFrameReader is not callable (see above).

More info: pyspark.sql.DataFrameReader.json — PySpark 3.1.2 documentation, pyspark.sql.DataFrameReader.load — PySpark 3.1.2 documentation

Static notebook | Dynamic notebook: See test 3, QUESTION NO: 34 (Databricks import instructions)