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(Variant #5, full patch, for 10.5) Do not produce SEL_ARG graphs that would yield huge numbers of ranges. Introduce a concept of SEL_ARG graph's "weight". If we are about to produce a graph whose "weight" exceeds the limit, remove the parts of SEL_ARG graph that represent the biggest key parts. Do so until the graph's is within the limit. Includes - debug code to verify SEL_ARG graph weight - A user-visible @@optimizer_max_sel_arg_weight to control the optimization - Logging the optimization into the optimizer trace. |
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