cudf
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Fix JSON parsing memory corruption - Fix Mixed types nested children removal
Description
Fixes https://github.com/rapidsai/cudf/issues/15750 The references of deleted child columns are not removed, which caused segfault, and also memory errors (found with valgrind). This fix removes references of child columns and deletes them recursively.
Checklist
- [x] I am familiar with the Contributing Guidelines.
- [x] New or existing tests cover these changes.
- [ ] The documentation is up to date with these changes.