Jefffrey commented on code in PR #24541:
URL: https://github.com/apache/datafusion/pull/24541#discussion_r3835087935
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datafusion/common/src/config.rs:
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@@ -748,6 +748,94 @@ impl Display for ConfigMinTwoUsize {
}
}
+/// A `u8` configuration value that rejects values greater than 100 when set
+/// from strings.
+///
+/// Use this for options that represent a percentage, such as
+/// [`OptimizerOptions::default_filter_selectivity`]. Without this, an
+/// out-of-range value (e.g. 200) is silently accepted at `SET` time and only
+/// rejected later, when the value is actually consumed (e.g. by
+/// `FilterExec`).
+#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
+pub struct ConfigFilterSelectivity(u8);
Review Comment:
might be better to leave this for a followup PR
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