Summary: Create new guc array_optimization_size_limit and use it to replace MAX_SAOP_ARRAY_SIZE in predtest.c.
Among other things this allows tuning when `col IN (1,2,3)` style expressions can be matched against partial indexes. It also fixes the comment: "XXX is it worth exposing this as a GUC knob?" Status: The attached patch applies cleanly to master, builds without error, and passes tests locally. Thanks, James Coleman
array_optimization_size_limit_guc-v1.patch
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