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MDEV-28201: Server crashes upon SHOW ANALYZE/EXPLAIN FORMAT=JSON
- Describe the lifetime of EXPLAIN data structures in sql_explain.h:ExplainDataStructureLifetime. - Make Item_field::set_field() call set_refers_to_temp_table() when it refers to a temp. table. - Introduce QT_DONT_ACCESS_TMP_TABLES flag for Item::print. It directs Item_field::print to not try access its the temp table. - Introduce Explain_query::notify_tables_are_closed() and call it right before the query closes its tables. - Make Explain data stuctures' print_explain_json() methods accept "no_tmp_tbl" parameter which means pass QT_DONT_ACCESS_TMP_TABLES when printing items. - Make Show_explain_request::call_in_target_thread() not call set_current_thd(). This wasn't needed as the code inside lex->print_explain() uses output->thd anyway. output->thd refers to the SHOW command's THD object.
This commit is contained in:
Sergei Petrunia
@ -128,11 +128,11 @@ relative_event_id relative_end_event_id event_name comment nesting_event_type re
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11 11 stage/sql/Executing (stage) STATEMENT 0
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12 12 stage/sql/End of update loop (stage) STATEMENT 0
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13 13 stage/sql/Query end (stage) STATEMENT 0
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14 14 stage/sql/Commit (stage) STATEMENT 0
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15 15 stage/sql/closing tables (stage) STATEMENT 0
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16 16 stage/sql/Starting cleanup (stage) STATEMENT 0
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17 18 stage/sql/Freeing items (stage) STATEMENT 0
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18 18 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 17
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14 15 stage/sql/Commit (stage) STATEMENT 0
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15 15 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 14
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16 16 stage/sql/closing tables (stage) STATEMENT 0
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17 17 stage/sql/Starting cleanup (stage) STATEMENT 0
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18 18 stage/sql/Freeing items (stage) STATEMENT 0
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19 19 wait/io/socket/sql/client_connection send STATEMENT 0
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20 21 stage/sql/Reset for next command (stage) STATEMENT 0
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21 21 wait/synch/mutex/sql/THD::LOCK_thd_data lock STAGE 20
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@ -152,11 +152,11 @@ relative_event_id relative_end_event_id event_name comment nesting_event_type re
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35 35 stage/sql/Executing (stage) STATEMENT 24
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36 36 stage/sql/End of update loop (stage) STATEMENT 24
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37 37 stage/sql/Query end (stage) STATEMENT 24
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38 38 stage/sql/Commit (stage) STATEMENT 24
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39 39 stage/sql/closing tables (stage) STATEMENT 24
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40 40 stage/sql/Starting cleanup (stage) STATEMENT 24
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41 42 stage/sql/Freeing items (stage) STATEMENT 24
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42 42 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 41
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38 39 stage/sql/Commit (stage) STATEMENT 24
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39 39 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 38
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40 40 stage/sql/closing tables (stage) STATEMENT 24
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41 41 stage/sql/Starting cleanup (stage) STATEMENT 24
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42 42 stage/sql/Freeing items (stage) STATEMENT 24
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43 43 wait/io/socket/sql/client_connection send STATEMENT 24
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44 45 stage/sql/Reset for next command (stage) STATEMENT 24
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45 45 wait/synch/mutex/sql/THD::LOCK_thd_data lock STAGE 44
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@ -176,11 +176,11 @@ relative_event_id relative_end_event_id event_name comment nesting_event_type re
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59 59 stage/sql/Executing (stage) STATEMENT 48
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60 60 stage/sql/End of update loop (stage) STATEMENT 48
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61 61 stage/sql/Query end (stage) STATEMENT 48
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62 62 stage/sql/Commit (stage) STATEMENT 48
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63 63 stage/sql/closing tables (stage) STATEMENT 48
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64 64 stage/sql/Starting cleanup (stage) STATEMENT 48
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65 66 stage/sql/Freeing items (stage) STATEMENT 48
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66 66 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 65
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62 63 stage/sql/Commit (stage) STATEMENT 48
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63 63 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 62
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64 64 stage/sql/closing tables (stage) STATEMENT 48
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65 65 stage/sql/Starting cleanup (stage) STATEMENT 48
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66 66 stage/sql/Freeing items (stage) STATEMENT 48
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67 67 wait/io/socket/sql/client_connection send STATEMENT 48
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68 69 stage/sql/Reset for next command (stage) STATEMENT 48
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69 69 wait/synch/mutex/sql/THD::LOCK_thd_data lock STAGE 68
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@ -203,12 +203,12 @@ select "With a third part to make things complete" as payload NULL NULL
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84 84 stage/sql/Executing (stage) STATEMENT 72
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85 85 stage/sql/End of update loop (stage) STATEMENT 72
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86 86 stage/sql/Query end (stage) STATEMENT 72
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87 87 stage/sql/Commit (stage) STATEMENT 72
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88 88 stage/sql/closing tables (stage) STATEMENT 72
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89 89 stage/sql/Starting cleanup (stage) STATEMENT 72
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90 92 stage/sql/Freeing items (stage) STATEMENT 72
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91 91 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 90
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92 92 wait/io/socket/sql/client_connection send STAGE 90
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87 88 stage/sql/Commit (stage) STATEMENT 72
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88 88 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 87
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89 89 stage/sql/closing tables (stage) STATEMENT 72
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90 90 stage/sql/Starting cleanup (stage) STATEMENT 72
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91 92 stage/sql/Freeing items (stage) STATEMENT 72
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92 92 wait/io/socket/sql/client_connection send STAGE 91
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93 110 statement/sql/select select "And this is the second part of a multi query" as payload;
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select "With a third part to make things complete" as payload NULL NULL
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94 96 stage/sql/starting (stage) STATEMENT 93
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@ -222,12 +222,12 @@ select "With a third part to make things complete" as payload NULL NULL
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102 102 stage/sql/Executing (stage) STATEMENT 93
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103 103 stage/sql/End of update loop (stage) STATEMENT 93
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104 104 stage/sql/Query end (stage) STATEMENT 93
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105 105 stage/sql/Commit (stage) STATEMENT 93
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106 106 stage/sql/closing tables (stage) STATEMENT 93
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107 107 stage/sql/Starting cleanup (stage) STATEMENT 93
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108 110 stage/sql/Freeing items (stage) STATEMENT 93
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109 109 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 108
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110 110 wait/io/socket/sql/client_connection send STAGE 108
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105 106 stage/sql/Commit (stage) STATEMENT 93
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106 106 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 105
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107 107 stage/sql/closing tables (stage) STATEMENT 93
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108 108 stage/sql/Starting cleanup (stage) STATEMENT 93
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109 110 stage/sql/Freeing items (stage) STATEMENT 93
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110 110 wait/io/socket/sql/client_connection send STAGE 109
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111 129 statement/sql/select select "With a third part to make things complete" as payload NULL NULL
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112 113 stage/sql/starting (stage) STATEMENT 111
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113 113 wait/synch/mutex/sql/THD::LOCK_thd_data lock STAGE 112
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@ -239,11 +239,11 @@ select "With a third part to make things complete" as payload NULL NULL
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119 119 stage/sql/Executing (stage) STATEMENT 111
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120 120 stage/sql/End of update loop (stage) STATEMENT 111
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121 121 stage/sql/Query end (stage) STATEMENT 111
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122 122 stage/sql/Commit (stage) STATEMENT 111
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123 123 stage/sql/closing tables (stage) STATEMENT 111
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124 124 stage/sql/Starting cleanup (stage) STATEMENT 111
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125 126 stage/sql/Freeing items (stage) STATEMENT 111
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126 126 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 125
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122 123 stage/sql/Commit (stage) STATEMENT 111
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123 123 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 122
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124 124 stage/sql/closing tables (stage) STATEMENT 111
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125 125 stage/sql/Starting cleanup (stage) STATEMENT 111
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126 126 stage/sql/Freeing items (stage) STATEMENT 111
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127 127 wait/io/socket/sql/client_connection send STATEMENT 111
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128 129 stage/sql/Reset for next command (stage) STATEMENT 111
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129 129 wait/synch/mutex/sql/THD::LOCK_thd_data lock STAGE 128
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@ -263,11 +263,11 @@ select "With a third part to make things complete" as payload NULL NULL
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143 143 stage/sql/Executing (stage) STATEMENT 132
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144 144 stage/sql/End of update loop (stage) STATEMENT 132
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145 145 stage/sql/Query end (stage) STATEMENT 132
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146 146 stage/sql/Commit (stage) STATEMENT 132
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147 147 stage/sql/closing tables (stage) STATEMENT 132
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148 148 stage/sql/Starting cleanup (stage) STATEMENT 132
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149 150 stage/sql/Freeing items (stage) STATEMENT 132
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150 150 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 149
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146 147 stage/sql/Commit (stage) STATEMENT 132
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147 147 wait/synch/mutex/sql/THD::LOCK_thd_kill lock STAGE 146
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148 148 stage/sql/closing tables (stage) STATEMENT 132
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149 149 stage/sql/Starting cleanup (stage) STATEMENT 132
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150 150 stage/sql/Freeing items (stage) STATEMENT 132
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151 151 wait/io/socket/sql/client_connection send STATEMENT 132
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152 153 stage/sql/Reset for next command (stage) STATEMENT 132
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153 153 wait/synch/mutex/sql/THD::LOCK_thd_data lock STAGE 152
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