$ perl ./mtr json.json_no_table --valgrind
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...
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json.json_no_table [ fail ] Found warnings/errors in server log file!
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Test ended at 2017-01-30 01:39:38
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line
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==11518== Thread 6:
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==11518== Conditional jump or move depends on uninitialised value(s)
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==11518== at 0x10F5C05: json_find_path (json_lib.c:1309)
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==11518== by 0xAF0ACD: Item_func_json_length::val_int() (item_jsonfunc.cc:1746)
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==11518== by 0x935F42: Item::send(Protocol*, String*) (item.cc:6888)
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==11518== by 0x5E06F9: Protocol::send_result_set_row(List<Item>*) (protocol.cc:979)
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==11518== by 0x660A2F: select_send::send_data(List<Item>&) (sql_class.cc:2761)
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==11518== by 0x6EE4EC: JOIN::exec_inner() (sql_select.cc:3279)
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==11518== by 0x6EDF87: JOIN::exec() (sql_select.cc:3199)
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==11518== by 0x6EF0F0: mysql_select(THD*, TABLE_LIST*, unsigned int, List<Item>&, Item*, unsigned int, st_order*, st_order*, Item*, st_order*, unsigned long long, select_result*, st_select_lex_unit*, st_select_lex*) (sql_select.cc:3584)
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==11518== by 0x6E40D0: handle_select(THD*, LEX*, select_result*, unsigned long) (sql_select.cc:373)
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==11518== by 0x6B05CA: execute_sqlcom_select(THD*, TABLE_LIST*) (sql_parse.cc:6399)
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==11518== by 0x6A65E4: mysql_execute_command(THD*) (sql_parse.cc:3429)
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==11518== by 0x6B3F9B: mysql_parse(THD*, char*, unsigned int, Parser_state*, bool, bool) (sql_parse.cc:7842)
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==11518== by 0x6A20A6: dispatch_command(enum_server_command, THD*, char*, unsigned int, bool, bool) (sql_parse.cc:1800)
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==11518== by 0x6A0A9E: do_command(THD*) (sql_parse.cc:1360)
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==11518== by 0x7E93DF: do_handle_one_connection(CONNECT*) (sql_connect.cc:1354)
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==11518== by 0x7E916C: handle_one_connection (sql_connect.cc:1260)
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...
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