DerGut commented on issue #15675:
URL: https://github.com/apache/datafusion/issues/15675#issuecomment-2795271167

   I just noticed that for even lower settings of `--memory-limit`, I get a 
different error e.g. 
   ```
   Error: Resources exhausted: Failed to allocate additional 10485760 bytes for 
ExternalSorterMerge[0] with 0 bytes already allocated for this reservation - 
9437184 bytes remain available for the total pool
   ```
   with `-m=9m`.
   
   My current suspicion is that the hard-coded 
https://github.com/apache/datafusion/blob/5ab5a03724b3afa009ba480a022145875972d08c/datafusion/common/src/config.rs#L341
 clashes with memory limits configured to the same value in some way which then 
breaks assumptions in the sort code.


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