uros-b opened a new pull request, #57989:
URL: https://github.com/apache/spark/pull/57989
### What changes were proposed in this pull request?
Unbraces 14 `${colName}` interpolations to `$colName` in
`CatalogColumnStat.toMap`/`fromMap`, leaving the qualified
`${CatalogColumnStat.KEY_...}` / `${KEY_...}` selects braced.
### Why are the changes needed?
The two methods mix `${colName}` and the bare `$colName` for the same value,
including on adjacent lines: the histogram key already reads
`s"$colName.${CatalogColumnStat.KEY_HISTOGRAM}"`. This makes all 14 remaining
sites consistent with that style. The qualified selects keep their braces on
purpose, because unbracing `${CatalogColumnStat.KEY_VERSION}` would interpolate
the object and append `.KEY_VERSION` as literal text.
### Does this PR introduce _any_ user-facing change?
No. These strings are the on-disk table-property keys for column statistics.
In every case `colName` is a simple parameter immediately followed by `.`, so
`$colName.` parses identically to `${colName}.` and the generated keys are
byte-for-byte unchanged, preserving metadata compatibility.
### How was this patch tested?
Existing catalog statistics tests cover `toMap`/`fromMap`. The change is a
lexical simplification with identical output.
### Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code (Opus 4.8)
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