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Fix undefined behavior in jofilter_index_impl.h#29

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fischer-martin wants to merge 1 commit intoDatabaseGroup:masterfrom
fischer-martin:fix-jofilter-illegal-memory-access
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Fix undefined behavior in jofilter_index_impl.h#29
fischer-martin wants to merge 1 commit intoDatabaseGroup:masterfrom
fischer-martin:fix-jofilter-illegal-memory-access

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postl_to_parent_ stores -1 for the root node which then results in undefined behavior when accessing postl_to_height_.
This is fixed by only updating p_i if is actually needed (i.e., when we aren't currently processing the root node).

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