mkleen commented on code in PR #23201:
URL: https://github.com/apache/datafusion/pull/23201#discussion_r3491061996
##########
datafusion/execution/src/cache/mod.rs:
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@@ -165,3 +168,145 @@ impl Display for TableScopedPath {
}
}
}
+
+/// A fingerprint of the `file_schema` used to compute a file's statistics.
+///
+/// Captures exactly the attributes that determine the layout and meaning of
+/// `Statistics::column_statistics`: each column's name, data type and
+/// nullability, in order. It deliberately excludes field/schema metadata,
which
+/// cannot affect statistics — including it would needlessly fragment the
cache.
+#[derive(Clone, Debug)]
+pub struct SchemaFingerprint {
Review Comment:
If you have a look at the benchmarks results `clickbench_partitioned` and
`wide_schema` you will find that without this optimization there are real
regressions.
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