gengliangwang opened a new pull request, #56222:
URL: https://github.com/apache/spark/pull/56222

   ### What changes were proposed in this pull request?
   
   Add `ExpressionImplUtils.crc32(byte[] bytes)` and route `Crc32`'s eval and 
codegen paths through it. `Crc32.doGenCode` previously emitted a 3-line 
allocate / `update` / `getValue` sequence inline; it now emits a single 
`ExpressionImplUtils.crc32(...)` call, and the eval path calls the same helper.
   
   This is a plain (non-ANSI, non-try/catch) type-independent block, in line 
with the broadened goal of SPARK-56908 to move fixed generated-Java logic into 
static Java helpers.
   
   ### Why are the changes needed?
   
   Part of SPARK-56908 (umbrella). Collapsing the inline CRC32 sequence to one 
call shrinks the generated Java for every stage that computes `crc32`, helping 
with the JVM 64KB method / constant-pool limits, Janino compile time, and JIT 
work.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No. The compiled behavior is identical; only the emitted Java source text 
changes.
   
   ### How was this patch tested?
   
   ```
   build/sbt "catalyst/testOnly *HashExpressionsSuite"
   ```
   
   40/40 pass, including `crc32` (exercised both with and without whole-stage 
codegen).
   
   ### Was this patch authored or co-authored using generative AI tooling?
   
   Generated-by: Claude Code (Opus 4.8)


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