fread skip sampling when all colClasses provided

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Assessment

Difficulty
3/5
Estimated time
1-2 days
Newbie friendliness
32/100
Issue type
Feature
Clarity
Needs clarification
Activity status
Stale
Tech stack
r
Domain
data

Research direction

Start with the TODO2 note in the linked issue comment and trace the fread entry point to understand when column-class sampling occurs. Done means sampling is skipped when all colClasses are supplied, with the relevant behavior verified by the existing fread tests if identified during that review.

Written by the indexing model from the issue text.

Description

fread performance

TODO2 here : https://github.com/Rdatatable/data.table/issues/2073#issuecomment-290582445

Dominant language
R
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Avg merge
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Merged PRs (30d)
4

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