HeartSaVioR opened a new pull request #27765: [SPARK-31014][CORE] 
InMemoryStore: remove key from parentToChildrenMap when removing key from 
CountingRemoveIfForEach
URL: https://github.com/apache/spark/pull/27765
 
 
   ### What changes were proposed in this pull request?
   
   This patch addresses missed spot on SPARK-30964 (#27716) - SPARK-30964 added 
secondary index which defines the relationship between parent - children and 
able to operate all children for given parent faster.
   
   While SPARK-30964 handled the addition and deletion of secondary index in 
InstanceList properly, it missed to add code to handle deletion of secondary 
index in CountingRemoveIfForEach, resulting to the leak of indices. This patch 
adds the deletion of secondary index in CountingRemoveIfForEach.
   
   ### Why are the changes needed?
   
   Described above.
   
   ### Does this PR introduce any user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   N/A, as relevant field and class are marked as private, and it cannot be 
checked in higher level. I'm not sure we want to adjust scope to add a test.

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