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cache. I found if I manually added a line to flush the whole relation cache, the assert error disappeared. Looking through the code, I found that the relation cache is flushed at the end of each query if the reference count is zero for the relation. However, printf's showed that the rd_relcnt(reference count) for the accessed query was not returning to zero after each query. It turns out the parser was doing a heap_ropen in parser/analyze.c to get information about the table's columns, but was not doing a heap_close. This was causing the query after the ALTER TABLE ADD to see the old table structure, and the executor's assert was reporting the problem.