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Bug #31094: Forcing index-based sort doesn't work anymore if joins are done
A rule was introduced by the 5.1 part of the fix for bug 27531 to prefer filesort over indexed ORDER BY when accessing all of the rows of a table (because it's faster). This new rule was not accounting for the presence of a LIMIT clause. Fixed the condition for this rule so it will prefer filesort over indexed ORDER BY only if no LIMIT. mysql-test/r/compress.result: Bug #31094: LIMIT is not considered a full index scan mysql-test/r/join.result: Bug #31094: test case mysql-test/r/select.result: Bug #31094: LIMIT is not considered a full index scan mysql-test/r/ssl.result: Bug #31094: LIMIT is not considered a full index scan mysql-test/r/ssl_compress.result: Bug #31094: LIMIT is not considered a full index scan mysql-test/t/join.test: Bug #31094: test case sql/sql_select.cc: Bug #31094: prefer filesort over indexed ORDER BY only if no LIMIT
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@ -897,4 +897,168 @@ select '^^: The above should be ~= 20 + cost(select * from t1). Value less than
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Z
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^^: The above should be ~= 20 + cost(select * from t1). Value less than 20 is an error
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drop table t1, t2;
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CREATE TABLE t1 (a INT PRIMARY KEY, b INT);
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CREATE TABLE t2 (c INT PRIMARY KEY, d INT);
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INSERT INTO t1 VALUES(1,NULL),(2,NULL),(3,NULL),(4,NULL);
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INSERT INTO t1 SELECT a + 4, b FROM t1;
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INSERT INTO t1 SELECT a + 8, b FROM t1;
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INSERT INTO t1 SELECT a + 16, b FROM t1;
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INSERT INTO t1 SELECT a + 32, b FROM t1;
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INSERT INTO t1 SELECT a + 64, b FROM t1;
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INSERT INTO t2 SELECT a, b FROM t1;
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EXPLAIN SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a LIMIT 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index NULL PRIMARY 4 NULL 2
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.b 1
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EXPLAIN SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a LIMIT 2;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 index PRIMARY PRIMARY 4 NULL 2
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1
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SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a LIMIT 2;
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a b c d
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SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a LIMIT 2;
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a b c d
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1 NULL 1 NULL
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2 NULL 2 NULL
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EXPLAIN SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL NULL NULL NULL NULL 128 Using filesort
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.b 1
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EXPLAIN SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE t1 ALL PRIMARY NULL NULL NULL 128 Using filesort
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1 SIMPLE t2 eq_ref PRIMARY PRIMARY 4 test.t1.a 1
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SELECT * FROM t1 JOIN t2 ON b=c ORDER BY a;
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a b c d
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SELECT * FROM t1 JOIN t2 ON a=c ORDER BY a;
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a b c d
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1 NULL 1 NULL
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2 NULL 2 NULL
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3 NULL 3 NULL
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4 NULL 4 NULL
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5 NULL 5 NULL
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6 NULL 6 NULL
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7 NULL 7 NULL
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8 NULL 8 NULL
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9 NULL 9 NULL
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10 NULL 10 NULL
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11 NULL 11 NULL
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12 NULL 12 NULL
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13 NULL 13 NULL
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14 NULL 14 NULL
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15 NULL 15 NULL
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16 NULL 16 NULL
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17 NULL 17 NULL
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18 NULL 18 NULL
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19 NULL 19 NULL
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20 NULL 20 NULL
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21 NULL 21 NULL
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22 NULL 22 NULL
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23 NULL 23 NULL
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24 NULL 24 NULL
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25 NULL 25 NULL
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26 NULL 26 NULL
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27 NULL 27 NULL
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28 NULL 28 NULL
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29 NULL 29 NULL
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30 NULL 30 NULL
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31 NULL 31 NULL
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32 NULL 32 NULL
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33 NULL 33 NULL
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34 NULL 34 NULL
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35 NULL 35 NULL
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36 NULL 36 NULL
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37 NULL 37 NULL
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38 NULL 38 NULL
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39 NULL 39 NULL
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40 NULL 40 NULL
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41 NULL 41 NULL
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42 NULL 42 NULL
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43 NULL 43 NULL
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44 NULL 44 NULL
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45 NULL 45 NULL
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46 NULL 46 NULL
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47 NULL 47 NULL
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48 NULL 48 NULL
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49 NULL 49 NULL
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50 NULL 50 NULL
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51 NULL 51 NULL
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52 NULL 52 NULL
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53 NULL 53 NULL
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54 NULL 54 NULL
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55 NULL 55 NULL
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56 NULL 56 NULL
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57 NULL 57 NULL
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58 NULL 58 NULL
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59 NULL 59 NULL
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60 NULL 60 NULL
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61 NULL 61 NULL
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62 NULL 62 NULL
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63 NULL 63 NULL
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64 NULL 64 NULL
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65 NULL 65 NULL
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66 NULL 66 NULL
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67 NULL 67 NULL
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68 NULL 68 NULL
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69 NULL 69 NULL
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70 NULL 70 NULL
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71 NULL 71 NULL
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72 NULL 72 NULL
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73 NULL 73 NULL
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74 NULL 74 NULL
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75 NULL 75 NULL
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76 NULL 76 NULL
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77 NULL 77 NULL
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78 NULL 78 NULL
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79 NULL 79 NULL
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80 NULL 80 NULL
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81 NULL 81 NULL
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82 NULL 82 NULL
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83 NULL 83 NULL
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84 NULL 84 NULL
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85 NULL 85 NULL
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86 NULL 86 NULL
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87 NULL 87 NULL
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88 NULL 88 NULL
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89 NULL 89 NULL
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90 NULL 90 NULL
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91 NULL 91 NULL
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92 NULL 92 NULL
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93 NULL 93 NULL
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94 NULL 94 NULL
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95 NULL 95 NULL
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96 NULL 96 NULL
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97 NULL 97 NULL
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98 NULL 98 NULL
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99 NULL 99 NULL
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100 NULL 100 NULL
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101 NULL 101 NULL
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102 NULL 102 NULL
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103 NULL 103 NULL
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104 NULL 104 NULL
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105 NULL 105 NULL
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106 NULL 106 NULL
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107 NULL 107 NULL
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108 NULL 108 NULL
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109 NULL 109 NULL
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110 NULL 110 NULL
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111 NULL 111 NULL
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112 NULL 112 NULL
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113 NULL 113 NULL
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114 NULL 114 NULL
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115 NULL 115 NULL
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116 NULL 116 NULL
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117 NULL 117 NULL
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118 NULL 118 NULL
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119 NULL 119 NULL
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120 NULL 120 NULL
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121 NULL 121 NULL
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122 NULL 122 NULL
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123 NULL 123 NULL
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124 NULL 124 NULL
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125 NULL 125 NULL
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126 NULL 126 NULL
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127 NULL 127 NULL
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128 NULL 128 NULL
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DROP TABLE IF EXISTS t1,t2;
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End of 5.0 tests.
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