Query Planning

파라미터	설명
`constraint_exclusion`
`cpu_index_tuple_cost`
`cpu_operator_cost`
`cpu_tuple_cost`
`cursor_tuple_fraction`
`default_statistics_target`
`effective_cache_size`
`enable_async_append`
`enable_bitmapscan`
`enable_distinct_reordering`
`enable_eager_aggregate`	query planner가 aggregation 일부를 join보다 먼저 수행하는 eager aggregation을 허용할지 결정한다.
`enable_gathermerge`
`enable_group_by_reordering`
`enable_hashagg`
`enable_hashjoin`
`enable_incremental_sort`
`enable_indexonlyscan`
`enable_indexscan`
`enable_material`
`enable_memoize`
`enable_mergejoin`
`enable_nestloop`
`enable_parallel_append`
`enable_parallel_hash`
`enable_partition_pruning`
`enable_partitionwise_aggregate`
`enable_partitionwise_join`
`enable_presorted_aggregate`
`enable_self_join_elimination`
`enable_seqscan`
`enable_sort`
`enable_tidscan`
`from_collapse_limit`
`geqo`
`geqo_effort`
`geqo_generations`
`geqo_pool_size`
`geqo_seed`
`geqo_selection_bias`
`geqo_threshold`
`jit`
`jit_above_cost`
`jit_inline_above_cost`
`jit_optimize_above_cost`
`join_collapse_limit`
`min_eager_agg_group_size`	eager aggregation 적용을 고려하는 데 필요한 최소 평균 group 크기를 정한다.
`min_parallel_index_scan_size`
`min_parallel_table_scan_size`
`parallel_setup_cost`
`parallel_tuple_cost`
`plan_cache_mode`
`random_page_cost`
`recursive_worktable_factor`
`seq_page_cost`