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Adding EXPLAIN SELECT tests for:

Browse Source 
MDEV-7649 wrong result when comparing utf8 column with an invalid literal
This is a preparatory patch for:
MDEV-8433 Make field<'broken-string' use indexes
This commit is contained in:
Alexander Barkov
2015-08-17 15:53:43 +04:00
parent 78b80cb6ba
commit 5fe8b747e9
4 changed files with 218 additions and 0 deletions
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18
mysql-test/include/ctype_utf8_ilseq.inc
View File

@@ -28,17 +28,35 @@ INSERT INTO t1 (ch) VALUES (_utf8 0x61D680);
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
--replace_column 9 #
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
--replace_column 9 #
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
--replace_column 9 #
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
--replace_column 9 #
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
--replace_column 9 #
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
--replace_column 9 #
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ALTER TABLE t1 DROP KEY ch;

64
mysql-test/r/ctype_uca.result
View File

@@ -6506,10 +6506,22 @@ SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
Warnings:
@@ -6552,6 +6564,12 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
ch
a
@@ -6573,6 +6591,12 @@ aЀ
aր
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
ch
a
@@ -6600,11 +6624,23 @@ z
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
ch
z
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
@@ -6714,10 +6750,22 @@ SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
Warnings:
@@ -6760,6 +6808,10 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
ch
a
@@ -6779,6 +6831,10 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
ch
a
@@ -6804,9 +6860,17 @@ z
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z

36
mysql-test/r/ctype_uca_innodb.result
View File

@@ -42,10 +42,22 @@ SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
Warnings:
@@ -88,6 +100,12 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
ch
a
@@ -109,6 +127,12 @@ aЀ
aր
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
ch
a
@@ -136,11 +160,23 @@ z
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
ch
z
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z

100
mysql-test/r/ctype_utf8.result
View File

@@ -5460,10 +5460,22 @@ SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
Warnings:
@@ -5506,6 +5518,12 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
ch
a
@@ -5527,6 +5545,12 @@ aЀ
aր
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
ch
a
@@ -5554,11 +5578,23 @@ z
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
ch
z
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
@@ -5668,10 +5704,22 @@ SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
Warnings:
@@ -5714,6 +5762,12 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
ch
a
@@ -5735,6 +5789,12 @@ aЀ
aր
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
ch
a
@@ -5762,11 +5822,23 @@ z
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
ch
z
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 index ch ch 182 NULL # Using where; Using index
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
@@ -5876,10 +5948,22 @@ SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆' ORDER BY ch;
ch
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86' for column 'ch' at row 1
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL # Impossible WHERE noticed after reading const tables
Warnings:
Warning 1366 Incorrect string value: '\xF0\x9D\x8C\x86b' for column 'ch' at row 1
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch='a𝌆b' ORDER BY ch;
ch
Warnings:
@@ -5922,6 +6006,10 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆' ORDER BY ch;
ch
a
@@ -5941,6 +6029,10 @@ ab
az
aЀ
aր
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch<'a𝌆b' ORDER BY ch;
ch
a
@@ -5966,9 +6058,17 @@ z
SELECT ch FROM t1 IGNORE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆' ORDER BY ch;
ch
z
EXPLAIN
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
id select_type table type possible_keys key key_len ref rows Extra
1 SIMPLE t1 ALL ch NULL NULL NULL # Using where; Using filesort
SELECT ch FROM t1 FORCE KEY (ch) WHERE ch>'a𝌆b' ORDER BY ch;
ch
z