Top N Max

📊 Top N Max Function

🔍 Definition

This function is used to:

➡️ Count the values of a field
➡️ Then take the N data with the largest max value

In other words:

    Aggregate + Automatic Ranking (Top N based on MAX)

⚙️ Parameter

1. 🎯 Field

Fields to be calculated the Max value

Example:

views
likes
sales

2. 🔢 Number of Record (N)

The amount of data you want to display
Example:
- 5 → Top 5
- 10 → Top 10

3. 🔀 Ordered (Y/N)

Y (Yes) → results are sorted (descending by max)
N (No) → results are not guaranteed

📌 Recommendation: use Y for clear results (Largest top)

📥 Input & 📤 Output

Input

Previous result data (usually after GroupBy)

Output
The output will contain:

All input fieldsNew fields:
- Field grouping with postfix_new
- Max result field

🧠 How it works

For example data:

    category        views
    ---------------------
    Music           100
    Music           200
    Gaming          300
    Gaming          100
    Gaming          50

After the process:

1. Max value per category

    category        max_views
    --------------------------
    Music           200
    Gaming          300

2. Top N (for example N=1)

    category_new    max_views
    -------------------------
    Gaming          300

🧪 Case Study Examples

🎯 Case:

Displays the Top 3 YouTube categories with the most max views

🔄 Workflow

Source → data YouTube
GroupBy → category
Top N Max:
- Field = views
- Number of Record = 3
- Ordered = Y

📊 Output:

    category_new	max_views
    -----------------------------
    Music               1000
    Gaming              900
    News                850

💡 Important Note:

The useful output fields from this buffer function are the grouped fields and new fields. Add a Transformator (

) assembly afterward to select these fields.