GPORCA配置参数

optimizer optimizer_analyze_root_partition optimizer_array_expansion_threshold optimizer_control optimizer_cte_inlining_bound optimizer_enable_master_only_queries optimizer_force_multistage_agg optimizer_force_three_stage_scalar_dqa	optimizer_mdcache_size optimizer_metadata_caching optimizer_nestloop_factor optimizer_parallel_union optimizer_print_missing_stats optimizer_print_optimization_stats optimizer_sort_factor

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