weimingdiit opened a new pull request, #2141:
URL: https://github.com/apache/auron/pull/2141

   # Which issue does this PR close?
   
   Closes #https://github.com/apache/auron/issues/2140
   
   # Rationale for this change
   `map_concat(...)` was not supported in Auron’s native execution path, so 
queries using it fell back instead of being executed natively.
   
   This change adds support through the extension-function path, which fits the 
existing pattern for Spark-specific functions implemented outside the standard 
builtin `ScalarFunction` chain.
   
   # What changes are included in this PR?
   This PR:
   - adds Spark `MapConcat` expression conversion in `NativeConverters`
   - introduces a dedicated native implementation in `spark_map.rs`
   - registers `Spark_MapConcat` in `datafusion-ext-functions`
   - adds a regression test in `AuronFunctionSuite`
   
   # Are there any user-facing changes?
   NO.
   # How was this patch tested?
   CI.


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