How Data is Stored & Queried

Watch what happens when an AI pipeline asks to "Sum the Price" in a Row-based format (CSV) versus a Columnar format (Parquet).

CSV File Structure

IDItemUserPrice
1
A
X
$10
2
B
Y
$20
3
C
Z
$15
4
D
W
$30

Inefficient: Scanned all 16 data points just to find 4 prices.

Parquet File Structure

ID
1
2
3
4
Item
A
B
C
D
User
X
Y
Z
W
Price
$10
$20
$15
$30

Efficient: Skipped irrelevant columns. Read 4 points instantly.