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Bug#33275457: Fix multi-valued index
Patch #4: Wrong results with AND of JSON_CONTAINS and multi-valued indexes For a multi-valued index on json array field f=[1, 2], this statement wrongly returned empty result set: SELECT * FROM f WHERE JSON_CONTAINS(f, 1) AND JSON_CONTAINS(f, 2); The cause is that get_func_mm_tree() converts two JSON_CONTAINS() to `f_idx = 1 AND f_idx = 2` which is always false for single value index but possible for multi-valued index. Fixed by anding the two key ranges, rather than marking the condition as always false. This is a contribution by Yubao Liu. Change-Id: I535fc6ce8755f4f3b6e8cbd77b4c0ee4aa685cae
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‎mysql-test/suite/json/r/array_index.result

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Original file line numberDiff line numberDiff line change
@@ -2721,6 +2721,270 @@ EXECUTE stmt USING @a;
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f1 f2 i id
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bar ["xx", "yy"] 1 xx
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bar ["xx", "yy"] 2 yy
2724+
EXPLAIN SELECT * FROM t1 WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2);
2725+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2726+
1 SIMPLE t1 NULL ref idx2 idx2 203 const 1 100.00 Using where
2727+
Warnings:
2728+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where (json'"xx"' member of (cast(`f2` as char(50) array)) and json'"yy"' member of (cast(`f2` as char(50) array)))
2729+
EXPLAIN
2730+
SELECT * FROM t1 WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"');
2731+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2732+
1 SIMPLE t1 NULL range idx2 idx2 203 NULL 1 100.00 Using where; Using MRR
2733+
Warnings:
2734+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where (json_contains(cast(`f2` as char(50) array),json'["xx"]') and json_contains(cast(`f2` as char(50) array),json'["yy"]'))
2735+
EXPLAIN
2736+
SELECT *
2737+
FROM t1
2738+
WHERE json_overlaps(f2, '["xx", "zz"]') AND json_overlaps(f2, '["yy", "zz"]');
2739+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2740+
1 SIMPLE t1 NULL range idx2 idx2 203 NULL 2 100.00 Using where; Using MRR
2741+
Warnings:
2742+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2` from `test`.`t1` where (json_overlaps(cast(`f2` as char(50) array),json'["xx", "zz"]') and json_overlaps(cast(`f2` as char(50) array),json'["yy", "zz"]'))
2743+
EXPLAIN SELECT * FROM v1 WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2);
2744+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2745+
1 SIMPLE t1 NULL ref idx2 idx2 203 const 1 100.00 Using where
2746+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2747+
Warnings:
2748+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table(`test`.`t1`.`f2`, '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json'"xx"' member of (cast(`f2` as char(50) array)) and json'"yy"' member of (cast(`f2` as char(50) array)))
2749+
EXPLAIN
2750+
SELECT * FROM v1 WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"');
2751+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2752+
1 SIMPLE t1 NULL range idx2 idx2 203 NULL 1 100.00 Using where; Using MRR
2753+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2754+
Warnings:
2755+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table(`test`.`t1`.`f2`, '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_contains(cast(`f2` as char(50) array),json'["xx"]') and json_contains(cast(`f2` as char(50) array),json'["yy"]'))
2756+
EXPLAIN
2757+
SELECT *
2758+
FROM v1
2759+
WHERE json_overlaps(f2, '["xx", "zz"]') AND json_overlaps(f2, '["yy", "zz"]');
2760+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2761+
1 SIMPLE t1 NULL range idx2 idx2 203 NULL 2 100.00 Using where; Using MRR
2762+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2763+
Warnings:
2764+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table(`test`.`t1`.`f2`, '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_overlaps(cast(`f2` as char(50) array),json'["xx", "zz"]') and json_overlaps(cast(`f2` as char(50) array),json'["yy", "zz"]'))
2765+
EXPLAIN
2766+
SELECT *
2767+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2768+
PATH '$')) AS ids
2769+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2);
2770+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2771+
1 SIMPLE t1 NULL ref idx2 idx2 203 const 1 100.00 Using where
2772+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2773+
Warnings:
2774+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table(`test`.`t1`.`f2`, '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json'"xx"' member of (cast(`f2` as char(50) array)) and json'"yy"' member of (cast(`f2` as char(50) array)))
2775+
EXPLAIN
2776+
SELECT *
2777+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2778+
PATH '$')) AS ids
2779+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"');
2780+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2781+
1 SIMPLE t1 NULL range idx2 idx2 203 NULL 1 100.00 Using where; Using MRR
2782+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2783+
Warnings:
2784+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table(`test`.`t1`.`f2`, '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_contains(cast(`f2` as char(50) array),json'["xx"]') and json_contains(cast(`f2` as char(50) array),json'["yy"]'))
2785+
EXPLAIN
2786+
SELECT *
2787+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2788+
PATH '$')) AS ids
2789+
WHERE json_overlaps(f2, '["xx", "zz"]') AND json_overlaps(f2, '["yy", "zz"]');
2790+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2791+
1 SIMPLE t1 NULL range idx2 idx2 203 NULL 2 100.00 Using where; Using MRR
2792+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2793+
Warnings:
2794+
Note 1003 /* select#1 */ select `test`.`t1`.`f1` AS `f1`,`test`.`t1`.`f2` AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table(`test`.`t1`.`f2`, '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_overlaps(cast(`f2` as char(50) array),json'["xx", "zz"]') and json_overlaps(cast(`f2` as char(50) array),json'["yy", "zz"]'))
2795+
EXPLAIN
2796+
SELECT *
2797+
FROM t1
2798+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF(f2) AND f1 = 'bar';
2799+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2800+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2801+
Warnings:
2802+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2` from `test`.`t1` where true
2803+
EXPLAIN
2804+
SELECT *
2805+
FROM t1
2806+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"') AND f1 = 'bar';
2807+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2808+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2809+
Warnings:
2810+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2` from `test`.`t1` where true
2811+
EXPLAIN
2812+
SELECT *
2813+
FROM t1
2814+
WHERE json_overlaps(f2, '["xx", "zz"]') AND
2815+
json_overlaps(f2, '["yy", "zz"]') AND
2816+
f1 = 'bar';
2817+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2818+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2819+
Warnings:
2820+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2` from `test`.`t1` where true
2821+
EXPLAIN
2822+
SELECT *
2823+
FROM v1
2824+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF(f2) AND f1 = 'bar';
2825+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2826+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2827+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2828+
Warnings:
2829+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table('["xx", "yy"]', '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json'"xx"' member of (cast('["xx", "yy"]' as char(50) array)) and json'"yy"' member of (cast('["xx", "yy"]' as char(50) array)))
2830+
EXPLAIN
2831+
SELECT *
2832+
FROM v1
2833+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"') AND f1 = 'bar';
2834+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2835+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2836+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2837+
Warnings:
2838+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table('["xx", "yy"]', '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_contains(cast('["xx", "yy"]' as char(50) array),json'["xx"]') and json_contains(cast('["xx", "yy"]' as char(50) array),json'["yy"]'))
2839+
EXPLAIN
2840+
SELECT *
2841+
FROM v1
2842+
WHERE json_overlaps(f2, '["xx", "zz"]') AND
2843+
json_overlaps(f2, '["yy", "zz"]') AND
2844+
f1 = 'bar';
2845+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2846+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2847+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2848+
Warnings:
2849+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table('["xx", "yy"]', '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_overlaps(cast('["xx", "yy"]' as char(50) array),json'["xx", "zz"]') and json_overlaps(cast('["xx", "yy"]' as char(50) array),json'["yy", "zz"]'))
2850+
EXPLAIN
2851+
SELECT *
2852+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2853+
PATH '$')) AS ids
2854+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2) AND f1 = 'bar';
2855+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2856+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2857+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2858+
Warnings:
2859+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table('["xx", "yy"]', '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json'"xx"' member of (cast('["xx", "yy"]' as char(50) array)) and json'"yy"' member of (cast('["xx", "yy"]' as char(50) array)))
2860+
EXPLAIN
2861+
SELECT *
2862+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2863+
PATH '$')) AS ids
2864+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"') AND f1 = 'bar';
2865+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2866+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2867+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2868+
Warnings:
2869+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table('["xx", "yy"]', '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_contains(cast('["xx", "yy"]' as char(50) array),json'["xx"]') and json_contains(cast('["xx", "yy"]' as char(50) array),json'["yy"]'))
2870+
EXPLAIN
2871+
SELECT *
2872+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2873+
PATH '$')) AS ids
2874+
WHERE json_overlaps(f2, '["xx", "zz"]') AND
2875+
json_overlaps(f2, '["yy", "zz"]') AND
2876+
f1 = 'bar';
2877+
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
2878+
1 SIMPLE t1 NULL const PRIMARY,idx2 PRIMARY 202 const 1 100.00 NULL
2879+
1 SIMPLE ids NULL ALL NULL NULL NULL NULL 2 100.00 Table function: json_table; Using temporary
2880+
Warnings:
2881+
Note 1003 /* select#1 */ select 'bar' AS `f1`,'["xx", "yy"]' AS `f2`,`ids`.`i` AS `i`,`ids`.`id` AS `id` from `test`.`t1` join json_table('["xx", "yy"]', '$[*]' columns (`i` for ordinality, `id` varchar(50) character set utf8mb4 path '$')) `ids` where (json_overlaps(cast('["xx", "yy"]' as char(50) array),json'["xx", "zz"]') and json_overlaps(cast('["xx", "yy"]' as char(50) array),json'["yy", "zz"]'))
2882+
SELECT * FROM t1 WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2);
2883+
f1 f2
2884+
bar ["xx", "yy"]
2885+
SELECT * FROM t1 WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"');
2886+
f1 f2
2887+
bar ["xx", "yy"]
2888+
SELECT *
2889+
FROM t1
2890+
WHERE json_overlaps(f2, '["xx", "zz"]') AND json_overlaps(f2, '["yy", "zz"]');
2891+
f1 f2
2892+
bar ["xx", "yy"]
2893+
SELECT * FROM v1 WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2);
2894+
f1 f2 i id
2895+
bar ["xx", "yy"] 1 xx
2896+
bar ["xx", "yy"] 2 yy
2897+
SELECT * FROM v1 WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"');
2898+
f1 f2 i id
2899+
bar ["xx", "yy"] 1 xx
2900+
bar ["xx", "yy"] 2 yy
2901+
SELECT *
2902+
FROM v1
2903+
WHERE json_overlaps(f2, '["xx", "zz"]') AND json_overlaps(f2, '["yy", "zz"]');
2904+
f1 f2 i id
2905+
bar ["xx", "yy"] 1 xx
2906+
bar ["xx", "yy"] 2 yy
2907+
SELECT *
2908+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2909+
PATH '$')) AS ids
2910+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2);
2911+
f1 f2 i id
2912+
bar ["xx", "yy"] 1 xx
2913+
bar ["xx", "yy"] 2 yy
2914+
SELECT *
2915+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2916+
PATH '$')) AS ids
2917+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"');
2918+
f1 f2 i id
2919+
bar ["xx", "yy"] 1 xx
2920+
bar ["xx", "yy"] 2 yy
2921+
SELECT *
2922+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2923+
PATH '$')) AS ids
2924+
WHERE json_overlaps(f2, '["xx", "zz"]') AND json_overlaps(f2, '["yy", "zz"]');
2925+
f1 f2 i id
2926+
bar ["xx", "yy"] 1 xx
2927+
bar ["xx", "yy"] 2 yy
2928+
SELECT *
2929+
FROM t1
2930+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2) AND f1 = 'bar';
2931+
f1 f2
2932+
bar ["xx", "yy"]
2933+
SELECT *
2934+
FROM t1
2935+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"') AND f1 = 'bar';
2936+
f1 f2
2937+
bar ["xx", "yy"]
2938+
SELECT *
2939+
FROM t1
2940+
WHERE json_overlaps(f2, '["xx", "zz"]') AND
2941+
json_overlaps(f2, '["yy", "zz"]') AND
2942+
f1 = 'bar';
2943+
f1 f2
2944+
bar ["xx", "yy"]
2945+
SELECT *
2946+
FROM v1
2947+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF (f2) AND f1 = 'bar';
2948+
f1 f2 i id
2949+
bar ["xx", "yy"] 1 xx
2950+
bar ["xx", "yy"] 2 yy
2951+
SELECT *
2952+
FROM v1
2953+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"') AND f1 = 'bar';
2954+
f1 f2 i id
2955+
bar ["xx", "yy"] 1 xx
2956+
bar ["xx", "yy"] 2 yy
2957+
SELECT *
2958+
FROM v1
2959+
WHERE json_overlaps(f2, '["xx", "zz"]') AND
2960+
json_overlaps(f2, '["yy", "zz"]') AND
2961+
f1 = 'bar';
2962+
f1 f2 i id
2963+
bar ["xx", "yy"] 1 xx
2964+
bar ["xx", "yy"] 2 yy
2965+
SELECT *
2966+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2967+
PATH '$')) AS ids
2968+
WHERE 'xx' MEMBER OF (f2) AND 'yy' MEMBER OF(f2) AND f1 = 'bar';
2969+
f1 f2 i id
2970+
bar ["xx", "yy"] 1 xx
2971+
bar ["xx", "yy"] 2 yy
2972+
SELECT *
2973+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2974+
PATH '$')) AS ids
2975+
WHERE json_contains(f2, '"xx"') AND json_contains(f2, '"yy"') AND f1 = 'bar';
2976+
f1 f2 i id
2977+
bar ["xx", "yy"] 1 xx
2978+
bar ["xx", "yy"] 2 yy
2979+
SELECT *
2980+
FROM t1, JSON_TABLE(f2, '$[*]' COLUMNS(i FOR ORDINALITY, id VARCHAR(50)
2981+
PATH '$')) AS ids
2982+
WHERE json_overlaps(f2, '["xx", "zz"]') AND
2983+
json_overlaps(f2, '["yy", "zz"]') AND
2984+
f1 = 'bar';
2985+
f1 f2 i id
2986+
bar ["xx", "yy"] 1 xx
2987+
bar ["xx", "yy"] 2 yy
27242988
EXPLAIN SELECT * FROM t1 WHERE 'xx' MEMBER OF (f2) OR 'zz' MEMBER OF (f2);
27252989
id select_type table partitions type possible_keys key key_len ref rows filtered Extra
27262990
1 SIMPLE t1 NULL range idx2 idx2 203 NULL 2 100.00 Using where; Using MRR

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