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https://github.com/MariaDB/server.git
synced 2025-07-30 16:24:05 +03:00
Changed the type of all double columns in the system statistical tables
mysql.column_stat, mysql.table_stat for the type DECIMAL(12,4). When cached the values from these columns are multiplied by factor 10^5 and stored as ulong numbers now.
This commit is contained in:
Igor Babaev
@ -20,34 +20,34 @@ dbt3_s001 region 5
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dbt3_s001 supplier 10
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select * from mysql.index_stat;
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db_name table_name index_name prefix_arity avg_frequency
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dbt3_s001 customer PRIMARY 1 1
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dbt3_s001 customer i_c_nationkey 1 6
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dbt3_s001 lineitem PRIMARY 1 4.003333333333333
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dbt3_s001 lineitem PRIMARY 2 1
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dbt3_s001 lineitem i_l_shipdate 1 2.650044130626655
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dbt3_s001 lineitem i_l_suppkey_partkey 1 30.025
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dbt3_s001 lineitem i_l_suppkey_partkey 2 8.57857142857143
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dbt3_s001 lineitem i_l_partkey 1 30.025
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dbt3_s001 lineitem i_l_suppkey 1 600.5
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dbt3_s001 lineitem i_l_receiptdate 1 2.6477072310405645
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dbt3_s001 lineitem i_l_orderkey 1 4.003333333333333
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dbt3_s001 lineitem i_l_orderkey_quantity 1 4.003333333333333
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dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0403672903672905
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dbt3_s001 lineitem i_l_commitdate 1 2.7159656264133876
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dbt3_s001 nation PRIMARY 1 1
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dbt3_s001 nation i_n_regionkey 1 5
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dbt3_s001 orders PRIMARY 1 1
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dbt3_s001 orders i_o_orderdate 1 1.3321492007104796
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dbt3_s001 orders i_o_custkey 1 15
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dbt3_s001 part PRIMARY 1 1
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dbt3_s001 part i_p_retailprice 1 1
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dbt3_s001 partsupp PRIMARY 1 3.5
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dbt3_s001 partsupp PRIMARY 2 1
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dbt3_s001 partsupp i_ps_partkey 1 3.5
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dbt3_s001 partsupp i_ps_suppkey 1 70
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dbt3_s001 region PRIMARY 1 1
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dbt3_s001 supplier PRIMARY 1 1
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dbt3_s001 supplier i_s_nationkey 1 1.1111111111111112
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dbt3_s001 customer PRIMARY 1 1.0000
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dbt3_s001 customer i_c_nationkey 1 6.0000
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dbt3_s001 lineitem PRIMARY 1 4.0033
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dbt3_s001 lineitem PRIMARY 2 1.0000
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dbt3_s001 lineitem i_l_shipdate 1 2.6500
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dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
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dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
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dbt3_s001 lineitem i_l_partkey 1 30.0250
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dbt3_s001 lineitem i_l_suppkey 1 600.5000
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dbt3_s001 lineitem i_l_receiptdate 1 2.6477
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dbt3_s001 lineitem i_l_orderkey 1 4.0033
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dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
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dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
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dbt3_s001 lineitem i_l_commitdate 1 2.7160
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dbt3_s001 nation PRIMARY 1 1.0000
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dbt3_s001 nation i_n_regionkey 1 5.0000
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dbt3_s001 orders PRIMARY 1 1.0000
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dbt3_s001 orders i_o_orderdate 1 1.3321
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dbt3_s001 orders i_o_custkey 1 15.0000
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dbt3_s001 part PRIMARY 1 1.0000
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dbt3_s001 part i_p_retailprice 1 1.0000
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dbt3_s001 partsupp PRIMARY 1 3.5000
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dbt3_s001 partsupp PRIMARY 2 1.0000
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dbt3_s001 partsupp i_ps_partkey 1 3.5000
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dbt3_s001 partsupp i_ps_suppkey 1 70.0000
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dbt3_s001 region PRIMARY 1 1.0000
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dbt3_s001 supplier PRIMARY 1 1.0000
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dbt3_s001 supplier i_s_nationkey 1 1.1111
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set optimizer_switch=@save_optimizer_switch;
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set @save_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='index_condition_pushdown=off';
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@ -93,71 +93,71 @@ dbt3_s001 region 5
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dbt3_s001 supplier 10
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select * from mysql.index_stat;
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db_name table_name index_name prefix_arity avg_frequency
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dbt3_s001 customer PRIMARY 1 1
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dbt3_s001 customer i_c_nationkey 1 6
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dbt3_s001 customer i_c_nationkey 2 1
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dbt3_s001 lineitem PRIMARY 1 4.003333333333333
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dbt3_s001 lineitem PRIMARY 2 1
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dbt3_s001 lineitem i_l_shipdate 1 2.650044130626655
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dbt3_s001 lineitem i_l_shipdate 2 1.014872401554842
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dbt3_s001 lineitem i_l_shipdate 3 1
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dbt3_s001 lineitem i_l_suppkey_partkey 1 30.025
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dbt3_s001 lineitem i_l_suppkey_partkey 2 8.57857142857143
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dbt3_s001 lineitem i_l_suppkey_partkey 3 1.0030065141139135
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dbt3_s001 lineitem i_l_suppkey_partkey 4 1
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dbt3_s001 lineitem i_l_partkey 1 30.025
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dbt3_s001 lineitem i_l_partkey 2 1.008904569892473
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dbt3_s001 lineitem i_l_partkey 3 1
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dbt3_s001 lineitem i_l_suppkey 1 600.5
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dbt3_s001 lineitem i_l_suppkey 2 1.207277844792923
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dbt3_s001 lineitem i_l_suppkey 3 1
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dbt3_s001 lineitem i_l_receiptdate 1 2.6477072310405645
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dbt3_s001 lineitem i_l_receiptdate 2 1.0152155536770922
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dbt3_s001 lineitem i_l_receiptdate 3 1
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dbt3_s001 lineitem i_l_orderkey 1 4.003333333333333
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dbt3_s001 lineitem i_l_orderkey 2 1
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dbt3_s001 lineitem i_l_orderkey_quantity 1 4.003333333333333
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dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0403672903672905
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dbt3_s001 lineitem i_l_orderkey_quantity 3 1
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dbt3_s001 lineitem i_l_commitdate 1 2.7159656264133876
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dbt3_s001 lineitem i_l_commitdate 2 1.036416983085951
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dbt3_s001 lineitem i_l_commitdate 3 1
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dbt3_s001 nation PRIMARY 1 1
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dbt3_s001 nation i_n_regionkey 1 5
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dbt3_s001 nation i_n_regionkey 2 1
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dbt3_s001 orders PRIMARY 1 1
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dbt3_s001 orders i_o_orderdate 1 1.3321492007104796
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dbt3_s001 orders i_o_orderdate 2 1
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dbt3_s001 orders i_o_custkey 1 15
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dbt3_s001 orders i_o_custkey 2 1
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dbt3_s001 part PRIMARY 1 1
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dbt3_s001 part i_p_retailprice 1 1
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dbt3_s001 part i_p_retailprice 2 1
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dbt3_s001 partsupp PRIMARY 1 3.5
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dbt3_s001 partsupp PRIMARY 2 1
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dbt3_s001 partsupp i_ps_partkey 1 3.5
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dbt3_s001 partsupp i_ps_partkey 2 1
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dbt3_s001 partsupp i_ps_suppkey 1 70
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dbt3_s001 partsupp i_ps_suppkey 2 1
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dbt3_s001 region PRIMARY 1 1
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dbt3_s001 supplier PRIMARY 1 1
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dbt3_s001 supplier i_s_nationkey 1 1.1111111111111112
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dbt3_s001 supplier i_s_nationkey 2 1
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dbt3_s001 customer PRIMARY 1 1.0000
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dbt3_s001 customer i_c_nationkey 1 6.0000
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dbt3_s001 customer i_c_nationkey 2 1.0000
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dbt3_s001 lineitem PRIMARY 1 4.0033
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dbt3_s001 lineitem PRIMARY 2 1.0000
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dbt3_s001 lineitem i_l_shipdate 1 2.6500
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dbt3_s001 lineitem i_l_shipdate 2 1.0149
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dbt3_s001 lineitem i_l_shipdate 3 1.0000
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dbt3_s001 lineitem i_l_suppkey_partkey 1 30.0250
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dbt3_s001 lineitem i_l_suppkey_partkey 2 8.5786
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dbt3_s001 lineitem i_l_suppkey_partkey 3 1.0030
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dbt3_s001 lineitem i_l_suppkey_partkey 4 1.0000
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dbt3_s001 lineitem i_l_partkey 1 30.0250
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dbt3_s001 lineitem i_l_partkey 2 1.0089
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dbt3_s001 lineitem i_l_partkey 3 1.0000
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dbt3_s001 lineitem i_l_suppkey 1 600.5000
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dbt3_s001 lineitem i_l_suppkey 2 1.2073
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dbt3_s001 lineitem i_l_suppkey 3 1.0000
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dbt3_s001 lineitem i_l_receiptdate 1 2.6477
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dbt3_s001 lineitem i_l_receiptdate 2 1.0152
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dbt3_s001 lineitem i_l_receiptdate 3 1.0000
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dbt3_s001 lineitem i_l_orderkey 1 4.0033
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dbt3_s001 lineitem i_l_orderkey 2 1.0000
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dbt3_s001 lineitem i_l_orderkey_quantity 1 4.0033
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dbt3_s001 lineitem i_l_orderkey_quantity 2 1.0404
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dbt3_s001 lineitem i_l_orderkey_quantity 3 1.0000
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dbt3_s001 lineitem i_l_commitdate 1 2.7160
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dbt3_s001 lineitem i_l_commitdate 2 1.0364
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dbt3_s001 lineitem i_l_commitdate 3 1.0000
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dbt3_s001 nation PRIMARY 1 1.0000
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dbt3_s001 nation i_n_regionkey 1 5.0000
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dbt3_s001 nation i_n_regionkey 2 1.0000
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dbt3_s001 orders PRIMARY 1 1.0000
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dbt3_s001 orders i_o_orderdate 1 1.3321
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dbt3_s001 orders i_o_orderdate 2 1.0000
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dbt3_s001 orders i_o_custkey 1 15.0000
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dbt3_s001 orders i_o_custkey 2 1.0000
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dbt3_s001 part PRIMARY 1 1.0000
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dbt3_s001 part i_p_retailprice 1 1.0000
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dbt3_s001 part i_p_retailprice 2 1.0000
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dbt3_s001 partsupp PRIMARY 1 3.5000
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dbt3_s001 partsupp PRIMARY 2 1.0000
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dbt3_s001 partsupp i_ps_partkey 1 3.5000
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dbt3_s001 partsupp i_ps_partkey 2 1.0000
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dbt3_s001 partsupp i_ps_suppkey 1 70.0000
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dbt3_s001 partsupp i_ps_suppkey 2 1.0000
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dbt3_s001 region PRIMARY 1 1.0000
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dbt3_s001 supplier PRIMARY 1 1.0000
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dbt3_s001 supplier i_s_nationkey 1 1.1111
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dbt3_s001 supplier i_s_nationkey 2 1.0000
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select * from mysql.table_stat where table_name='orders';
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db_name table_name cardinality
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dbt3_s001 orders 1500
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select * from mysql.index_stat where table_name='orders';
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db_name table_name index_name prefix_arity avg_frequency
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dbt3_s001 orders PRIMARY 1 1
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dbt3_s001 orders i_o_orderdate 1 1.3321492007104796
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dbt3_s001 orders i_o_orderdate 2 1
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dbt3_s001 orders i_o_custkey 1 15
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dbt3_s001 orders i_o_custkey 2 1
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dbt3_s001 orders PRIMARY 1 1.0000
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dbt3_s001 orders i_o_orderdate 1 1.3321
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dbt3_s001 orders i_o_orderdate 2 1.0000
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dbt3_s001 orders i_o_custkey 1 15.0000
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dbt3_s001 orders i_o_custkey 2 1.0000
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select (select cardinality from mysql.table_stat where table_name='orders') /
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(select avg_frequency from mysql.index_stat
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where index_name='i_o_orderdate' and prefix_arity=1) as n_distinct;
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n_distinct
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1126
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1126.0416
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select count(distinct o_orderdate) from orders;
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count(distinct o_orderdate)
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1126
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@ -165,20 +165,20 @@ select (select cardinality from mysql.table_stat where table_name='orders') /
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(select avg_frequency from mysql.index_stat
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where index_name='i_o_custkey' and prefix_arity=1) as n_distinct;
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n_distinct
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100
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100.0000
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select count(distinct o_custkey) from orders;
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count(distinct o_custkey)
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100
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show index from orders;
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Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
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orders 0 PRIMARY 1 o_orderkey A 1500 NULL NULL BTREE
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orders 1 i_o_orderdate 1 o_orderDATE A 1127 NULL NULL YES BTREE
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orders 1 i_o_orderdate 1 o_orderDATE A 1126 NULL NULL YES BTREE
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orders 1 i_o_custkey 1 o_custkey A 100 NULL NULL YES BTREE
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select index_name, column_name, cardinality from information_schema.statistics
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where table_name='orders';
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index_name column_name cardinality
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PRIMARY o_orderkey 1500
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i_o_orderdate o_orderDATE 1127
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i_o_orderdate o_orderDATE 1126
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i_o_custkey o_custkey 100
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set @save_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='index_condition_pushdown=off';
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