The array sortgrouprefs[] inside PathTarget might be NULL if we have not identified sort/group columns in this tlist. In that case we would have a NULL pointer reference in _outPathTarget() when trying to print sortgrouprefs[] with WRITE_INDEX_ARRAY as we are using the length of PathTarget->exprs as its array length.
Attached is a fix that can address this problem. Thanks Richard
fix_array_length_for_printing_sortgrouprefs.patch
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