[SPARK-58436][SQL][DOC] Add missing @since tags in functions.scala - #57643
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### What changes were proposed in this pull request? Adds missing `since` tags to the four `group`-documented functions in the shared SQL functions API (`functions.scala`) that lacked one: `expr` (1.5.0), `substring_index` (1.5.0), and both `udaf(Aggregator)` overloads (3.0.0). ### Why are the changes needed? Every other public function in `functions.scala` carries an `since` tag; these four were the only `group`-documented outliers. Versions were confirmed against each function's originating commit / first release tag and the corresponding Python `versionadded`. After this change no `group`-documented function in the file is missing `since` ### Does this PR introduce _any_ user-facing change? No (scaladoc only; no signature change). ### How was this patch tested? Doc-only change. No tests needed. ### Was this patch authored or co-authored using generative AI tooling? Generated-by: Claude Code (Opus 4.8) Closes #57643 from uros-b/apidoc-functions-expr-since. Authored-by: Uros Bojanic <221401595+uros-b@users.noreply.github.com> Signed-off-by: Ruifeng Zheng <ruifengz@apache.org> (cherry picked from commit 256d453) Signed-off-by: Ruifeng Zheng <ruifengz@apache.org>
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What changes were proposed in this pull request?
Adds missing
@sincetags to the four@group-documented functions in the shared SQL functions API (functions.scala) that lacked one:expr(1.5.0),substring_index(1.5.0), and bothudaf(Aggregator)overloads (3.0.0).Why are the changes needed?
Every other public function in
functions.scalacarries an@sincetag; these four were the only@group-documented outliers. Versions were confirmed against each function's originating commit / first release tag and the corresponding Pythonversionadded. After this change no@group-documented function in the file is missing@sinceDoes this PR introduce any user-facing change?
No (scaladoc only; no signature change).
How was this patch tested?
Doc-only change. No tests needed.
Was this patch authored or co-authored using generative AI tooling?
Generated-by: Claude Code (Opus 4.8)