[I] Add the array functions `ARRAY_REVERSE` / `ARRAY_MAX` / `ARRAY_MIN` [geaflow]

["Leomrlin (via GitHub)" <gi...@apache.org>]

Leomrlin opened a new issue, #792:
URL: https://github.com/apache/geaflow/issues/792

   ### What & why
   
   `udf/table/array/` currently has just four functions (`ArrayAppend`,
   `ArrayContains`, `ArrayDistinct`, `ArrayUnion`). Adding `ARRAY_REVERSE` and
   `ARRAY_MAX` / `ARRAY_MIN` rounds out array handling and is a nice exercise in
   Java generics and edge-case thinking.
   
   数组函数目录现在只有四个。补上 `ARRAY_REVERSE`(反转)、`ARRAY_MAX`/`ARRAY_MIN`(取最值),
   能让数组处理更完整,也是练 Java 泛型和边界思维的好题。
   
   ### The task
   
   - `array_reverse(arr)` → reversed array
   - `array_max(arr)` / `array_min(arr)` → max/min element (handle numeric types and null elements)
   
   ### Where to look
   
   1. There are two patterns to borrow: `ArrayDistinct.java` (array in → array out)
      and `ArrayContains.java` (array in → scalar out). Add `ArrayReverse.java`,
      `ArrayMax.java`, `ArrayMin.java`.
   2. Register in `BuildInSqlFunctionTable.java`.
   3. Test empty arrays, arrays with null elements, and single-element arrays.
   
   ### Done when
   
   - [ ] Three functions implemented and registered
   - [ ] Empty / null-element / single-element cases clearly handled
   - [ ] Your policy for null elements in `array_max/min` is explained in the PR
   - [ ] Tests pass
   


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Re: [I] Add the array functions `ARRAY_REVERSE` / `ARRAY_MAX` / `ARRAY_MIN` [geaflow]

["Adityaaprakash (via GitHub)" <gi...@apache.org>]

Adityaaprakash commented on issue #792:
URL: https://github.com/apache/geaflow/issues/792#issuecomment-4738694654

   Hi! I'd like to work on this issue if it's still available.


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