Discuss Databricks Databricks Certified Data Analyst Associate Exam Topic 2 Question 23

In which of the following situations should a data analyst use higher-order functions?

AWhen custom logic needs to be applied to simple, unnested data

BWhen custom logic needs to be converted to Python-native code

CWhen custom logic needs to be applied at scale to array data objects

DWhen built-in functions are taking too long to perform tasks

EWhen built-in functions need to run through the Catalyst Optimizer

Suggested Answer: C

Higher-order functions are a simple extension to SQL to manipulate nested data such as arrays. A higher-order function takes an array, implements how the array is processed, and what the result of the computation will be. It delegates to a lambda function how to process each item in the array. This allows you to define functions that manipulate arrays in SQL, without having to unpack and repack them, use UDFs, or rely on limited built-in functions. Higher-order functions provide a performance benefit over user defined functions.Reference:Higher-order functions | Databricks on AWS,Working with Nested Data Using Higher Order Functions in SQL on Databricks | Databricks Blog,Higher-order functions - Azure Databricks | Microsoft Learn,Optimization recommendations on Databricks | Databricks on AWS

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49 comments · newest first

Veronika 10 months ago

B seems off, custom logic doesn't need to be Python-native.

Paulene 11 months ago

Wait, can they really optimize built-in functions?

Rolande 11 months ago

Definitely C, that's where they shine!

Michal 11 months ago

I think it's mostly for when built-in functions are slow.

Rosalind 11 months ago

Higher-order functions are great for array data!

Steffanie 12 months ago

I vaguely remember something about the Catalyst Optimizer, but I’m not confident if that’s relevant here. Maybe option E?

Von 12 months ago

I feel like there was a practice question about built-in functions being slow, but I can't recall if that relates to higher-order functions.

Carey 12 months ago

I think higher-order functions are definitely useful for scaling operations on array data. That sounds like option C to me.

Sunshine 1 year ago

I remember we discussed higher-order functions in class, but I'm not sure if they apply to simple data or just more complex structures.

Lenna 1 year ago

Ah, this is a great question to test our understanding of higher-order functions! I think the key is recognizing that they are useful for applying custom logic, especially to array data. I'm leaning towards option C, but I'll double-check the other options just to be sure.

Nilsa 1 year ago

This is a tricky one. I'm not super familiar with higher-order functions, so I'm a bit lost on the differences between these scenarios. I'll have to rely on my general data analysis knowledge to try and eliminate some options.

Melodie 1 year ago

Okay, I think the key here is understanding when custom logic needs to be applied. Options A and C seem most relevant, but I'm not sure which one is the best answer. I'll make my best guess and move on.

Celestina 1 year ago

Hmm, I'm a bit unsure about this one. I know higher-order functions are useful for applying custom logic, but I'm not sure which of these scenarios is the best fit. I'll have to re-read the options carefully.

Curtis 1 year ago

This looks like a straightforward question about when to use higher-order functions. I'll need to think through the key differences between the options, but I'm feeling confident I can figure this out.

Pete 1 year ago

Okay, I think I've got it. Option A covers the main organizational systems that can impact a project, like the policies, procedures, and resources available. That seems like the most comprehensive answer.

Mitsue 2 years ago

Higher-order functions? Is that like when you order a burger and they ask if you want fries with that?

Latanya 2 years ago

This question is making my brain hurt. I'll just pick C and hope the Catalyst Optimizer can handle it.

Barbra 2 years ago

B, for sure. Converting custom logic to Python-native code is the whole point of using higher-order functions, isn't it?

Lavera 2 years ago

↳ replying to Barbra

B, for sure. Converting custom logic to Python-native code is the whole point of using higher-order functions, isn't it?

Casandra 2 years ago

↳ replying to Barbra

E) When built-in functions need to run through the Catalyst Optimizer

Antonette 2 years ago

↳ replying to Barbra

D) When built-in functions are taking too long to perform tasks

Patrick 2 years ago

↳ replying to Barbra

C) When custom logic needs to be applied at scale to array data objects

Azalee 2 years ago

↳ replying to Barbra

B) When custom logic needs to be converted to Python-native code

Kati 2 years ago

↳ replying to Barbra

A) When custom logic needs to be applied to simple, unnested data

Eun 2 years ago

D is the way to go! If built-in functions are taking too long, higher-order functions can really speed things up.

Joni 2 years ago

I think C is the correct answer here. Higher-order functions are great for applying custom logic at scale to array data objects.

Lelia 2 years ago

↳ replying to Joni

Yes, that's correct. Higher-order functions are perfect for handling array data objects efficiently.

Charlena 2 years ago

↳ replying to Joni

C) When custom logic needs to be applied at scale to array data objects

Arletta 2 years ago

↳ replying to Joni

A) When custom logic needs to be applied to simple, unnested data

Carmen 2 years ago

E, obviously. The Catalyst Optimizer is the secret sauce for any data analyst worth their salt. Higher-order functions are the way to unlock its power!

Theron 2 years ago

But what about when built-in functions are taking too long to perform tasks? Wouldn't using higher-order functions help speed up the process?

Flo 2 years ago

Higher-order functions? That's just fancy talk for 'doing math with functions'. I'll go with A, keep it simple, you know?

Rashad 2 years ago

↳ replying to Flo

User 3: Agreed, A is the way to go for that situation.

Louvenia 2 years ago

↳ replying to Flo

User 2: Yeah, higher-order functions are just about applying custom logic to simple data.

Jeannine 2 years ago

↳ replying to Flo

I think A is the right choice, keep it simple.

Kristofer 2 years ago

I agree with Haydee. Using higher-order functions can make it easier to apply custom logic to large datasets efficiently.

Lenna 2 years ago

Hmm, I'm not sure about this one. I guess I'll go with B since converting custom logic to Python-native code seems like a good use case for higher-order functions.

Haydee 2 years ago

I think a data analyst should use higher-order functions when custom logic needs to be applied at scale to array data objects.

Lonny 2 years ago

D seems like the obvious choice here. If built-in functions are taking too long, higher-order functions can optimize the process.

Shaun 2 years ago

↳ replying to Lonny

E) When built-in functions need to run through the Catalyst Optimizer

Marleen 2 years ago

↳ replying to Lonny

D) When built-in functions are taking too long to perform tasks

Kimi 2 years ago

↳ replying to Lonny

D) When built-in functions are taking too long to perform tasks

Cammy 2 years ago

↳ replying to Lonny

C) When custom logic needs to be applied at scale to array data objects

Stanford 2 years ago

↳ replying to Lonny

C) When custom logic needs to be applied at scale to array data objects

Reita 2 years ago

↳ replying to Lonny

A) When custom logic needs to be applied to simple, unnested data

Vi 2 years ago

↳ replying to Lonny

A) When custom logic needs to be applied to simple, unnested data

Cassandra 2 years ago

I think the correct answer is C. Higher-order functions are great for applying custom logic at scale to array data objects.

Juan 2 years ago

↳ replying to Cassandra

I think it's C too. It makes sense to use higher-order functions for array data objects.

Juan 2 years ago

↳ replying to Cassandra

I agree, higher-order functions are perfect for applying custom logic at scale to array data objects.

Databricks Certified Data Analyst Associate Exam - Topic 2 Question 23 Discussion