[SPARK-9577][SQL] Surface concrete iterator types in various sort classes. #7911
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…sses. We often return abstract iterator types in various sort-related classes (e.g. UnsafeKVExternalSorter). It is actually better to return a more concrete type, so the callsite uses that type and JIT can inline the iterator calls. Author: Reynold Xin <rxin@databricks.com> Closes #7911 from rxin/surface-concrete-type and squashes the following commits: 0422add [Reynold Xin] [SPARK-9577][SQL] Surface concrete iterator types in various sort classes. (cherry picked from commit 5eb89f6) Signed-off-by: Reynold Xin <rxin@databricks.com>
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We often return abstract iterator types in various sort-related classes (e.g. UnsafeKVExternalSorter). It is actually better to return a more concrete type, so the callsite uses that type and JIT can inline the iterator calls.