Minor: refine row selection example more #5850
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alamb
commented
Jun 6, 2024
| /// Select 50-100 (scan rows 50-100 in row group 2) | ||
| /// Skip 50 (skip the first 50 rows in row group 2) | ||
| /// Select 50 (scan rows 50-100 in row group 2) | ||
| /// Skip 900 (skip the remaining rows in row group 2) |
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Not showing this "skip remaining rows in row group" I think was part of what was confusing
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I don't remember if this is actually required, the readers actually trim trailing skips, but good to document regardless
tustvold
approved these changes
Jun 11, 2024
|
Thanks @tustvold |
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Which issue does this PR close?
Follow on to #5824
Rationale for this change
In discussing how row selections interacted with the row group selection with @advancedxy on apache/datafusion#10738 (see https://github.com/apache/datafusion/pull/10738/files#r1628074742) it became clear that the example could be improved to better explain what is going on
What changes are included in this PR?
Refine example added in #5824 to better show how how skip / select works at the end of a row group.
Are there any user-facing changes?
Moar docs, no functional change