2022-09-07 mysql/stonedb-查询优化器逻辑记录及优化器魔改

摘要:

记录STONEDB对于mysql的查询优化器的使用

逻辑关系:

调用堆栈:

(gdb) bt
#0  JOIN::optimize (this=0x7fb23804e600, part=1 '\001') at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-131-20220805/sql/sql_optimizer.cc:296
#1  0x0000000002c70a23 in Tianmu::core::optimize_select (thd=0x7fb238002c10, select_options=2147748608, result=0x7fb238011940, select_lex=0x7fb238007da0, 
    optimize_after_tianmu=@0x7fb468da9d0c: 1, free_join=@0x7fb468da9d10: 1) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-131-20220805/storage/tianmu/core/engine_execute.cpp:352
#2  0x0000000002c702d6 in Tianmu::core::Engine::HandleSelect (this=0x5df8fd0, thd=0x7fb238002c10, lex=0x7fb238004f38, result=@0x7fb468da9d18: 0x7fb238011940, setup_tables_done_option=0, 
    res=@0x7fb468da9d14: 0, optimize_after_tianmu=@0x7fb468da9d0c: