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The patch also adjusts several instable test results to order the result. Analysis: The function prev_record_reads() may skip (jump over) some query plan nodes where record_count < 1. At the same time, even though get_partial_join_cost() uses all first N plan nodes after the last constant table, it may produce a smaller record_count than prev_record_reads(), because the record count for some plan nodes may be < 1, and these nodes may not participate in prev_record_reads. Solution: The current solution is to treat the result of get_partial_join_cost() as the upper bound for the total number of unique lookup keys. |
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