Databricks Certified Data Engineer Associate Exam - Topic 2 Question 46 Discussion

Actual exam question for Databricks's Databricks Certified Data Engineer Associate exam

Question #: 46
Topic #: 2

[All Databricks Certified Data Engineer Associate Questions]

A data engineer has developed a data pipeline to ingest data from a JSON source using Auto Loader, but the engineer has not provided any type inference or schema hints in their pipeline. Upon reviewing the data, the data engineer has noticed that all of the columns in the target table are of the string type despite some of the fields only including float or boolean values.

Which of the following describes why Auto Loader inferred all of the columns to be of the string type?

AThere was a type mismatch between the specific schema and the inferred schema

BJSON data is a text-based format

CAuto Loader only works with string data

DAll of the fields had at least one null value

EAuto Loader cannot infer the schema of ingested data

Show Suggested Answer

Suggested Answer: A

To grant full privileges on a table such as 'sales' to a group like 'team', the correct SQL command in Databricks is:

GRANT ALL PRIVILEGES ON TABLE sales TO team;

This command assigns all available privileges, including SELECT, INSERT, UPDATE, DELETE, and any other data manipulation or definition actions, to the specified team. This is typically necessary when a team needs full control over a table to manage and manipulate it as part of a project or ongoing maintenance.

Reference: Databricks documentation on SQL permissions: SQL Permissions in Databricks

by Apolonia at Mar 09, 2025, 05:56 AM

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Melodie

2 months ago

All fields having null values could lead to this too.

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Adria

3 months ago

Wait, Auto Loader can't infer schema? That's surprising!

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Miss

3 months ago

Definitely not true that Auto Loader only works with strings.

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Frederica

3 months ago

I think it's more about the type mismatch.

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Tammy

3 months ago

JSON is text-based, so that makes sense.

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Verlene

4 months ago

I thought Auto Loader could infer types, but maybe it can’t if no hints are provided? That might explain the all-string columns.

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Charlena

4 months ago

I practiced a similar question where schema inference was affected by the data types present. Could it be that Auto Loader just defaults to strings?

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Stephen

4 months ago

I’m not entirely sure, but I think if there are null values, it might cause issues with type inference.

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Sylvie

4 months ago

I remember reading that JSON is text-based, so maybe that's why everything ended up as strings?

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Dorian

4 months ago

Okay, I'm feeling more confident now. I'll go with option A as the best answer. The question states that some of the fields only include float or boolean values, so there was a type mismatch between the inferred schema and the actual data.

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Felicitas

5 months ago

Ah, I think I've got it. The key here is that Auto Loader defaults to using the string data type if it can't confidently infer the correct type. So the type mismatch between the inferred schema and the actual data is likely the reason for the issue.

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Delmy

5 months ago

I'm a bit confused by the wording of the question. Is the issue that Auto Loader didn't correctly infer the data types, or that the engineer didn't provide any type hints? I'll need to re-read the question to make sure I understand the root cause.

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Reita

5 months ago

Okay, let's see. The question mentions that the data is in JSON format, so that rules out option C. And since the engineer didn't provide any schema hints, that means Auto Loader had to infer the schema on its own.

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Cory

5 months ago

Hmm, this seems like a tricky one. I'll need to think through the options carefully and consider what I know about Auto Loader and schema inference.

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Celeste

5 months ago

This question is testing our understanding of Auto Loader's behavior with unstructured data sources. I'll need to carefully consider each option to determine the most accurate explanation.

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Tracey

5 months ago

I'm pretty confident I know the answer on this one. It's option B - JSON data is a text-based format, so Auto Loader will treat all the fields as strings without any type inference.

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Irma

5 months ago

Okay, I think I've got this. The key is understanding that JSON is a text-based format, so Auto Loader will infer all the columns as strings by default unless you provide explicit schema hints.

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