(gdb) bt
#0  Item_func::fix_func_arg (this=0x7f847c0156d8, thd=0x7f847c010540, arg=0x7f847c015780) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:263
#1  0x0000000001d5e5a2 in Item_func::fix_fields (this=0x7f847c0156d8, thd=0x7f847c010540, ref=0x7f847c014d68) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:249
#2  0x0000000001d76a00 in Item_func_sp::fix_fields (this=0x7f847c0156d8, thd=0x7f847c010540, ref=0x7f847c014d68) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:8860
#3  0x0000000002293b8a in setup_fields (thd=0x7f847c010540, ref_pointer_array=..., fields=..., want_privilege=1, sum_func_list=0x7f847c014090, allow_sum_func=true, column_update=false)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:9138
#4  0x00000000023333ad in st_select_lex::prepare (this=0x7f847c013f30, thd=0x7f847c010540) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:197
#5  0x00000000029d620a in Tianmu::core::optimize_select (thd=0x7f847c010540, select_options=2147748608, result=0x7f847c01de60, select_lex=0x7f847c013f30, optimize_after_tianmu=@0x7f8665d29dec: 0, 
    free_join=@0x7f8665d29df0: 1) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/storage/tianmu/core/engine_execute.cpp:338
#6  0x00000000029d5bc4 in Tianmu::core::Engine::HandleSelect (this=0x49f6160, thd=0x7f847c010540, lex=0x7f847c0126b8, result=@0x7f8665d29df8: 0x7f847c01de60, setup_tables_done_option=0, 
    res=@0x7f8665d29df4: 0, optimize_after_tianmu=@0x7f8665d29dec: 0, tianmu_free_join=@0x7f8665d29df0: 1, with_insert=0)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/storage/tianmu/core/engine_execute.cpp:225
#7  0x0000000002abb3b4 in Tianmu::dbhandler::TIANMU_HandleSelect (thd=0x7f847c010540, lex=0x7f847c0126b8, result=@0x7f8665d29df8: 0x7f847c01de60, setup_tables_done_option=0, res=@0x7f8665d29df4: 0, 
    optimize_after_tianmu=@0x7f8665d29dec: 0, tianmu_free_join=@0x7f8665d29df0: 1, with_insert=0) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/storage/tianmu/handler/ha_rcengine.cpp:82
#8  0x00000000022ff727 in execute_sqlcom_select (thd=0x7f847c010540, all_tables=0x7f847c01cc18) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:5182
#9  0x00000000022f954f in mysql_execute_command (thd=0x7f847c010540, first_level=true) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:2831
#10 0x000000000230042e in mysql_parse (thd=0x7f847c010540, parser_state=0x7f8665d2af00) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:5621
#11 0x00000000022f6878 in dispatch_command (thd=0x7f847c010540, com_data=0x7f8665d2b660, command=COM_QUERY) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:1495
#12 0x00000000022f5a1b in do_command (thd=0x7f847c010540) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:1034
#13 0x00000000023f995b in handle_connection (arg=0x6903780) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/conn_handler/connection_handler_per_:313
#14 0x0000000002915591 in pfs_spawn_thread (arg=0x6947e30) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/storage/perfschema/:2197
#15 0x00007f86b0cfeea5 in start_thread () from /lib64/libpthread.so.0
#16 0x00007f86ae222b0d in clone () from /lib64/libc.so.6

(gdb) p *(Item_field*)args[0]
$182 = {
  <Item_ident> = {
    <Item> = {
      <Parse_tree_node> = {
        _vptr.Parse_tree_node = 0x3c704d8 <vtable for Item_field+16>
      }, 
      members of Item: 
      is_expensive_cache = -1 '\377', 
      rsize = 0, 
      str_value = {
        m_ptr = 0x0, 
        m_length = 0, 
        m_charset = 0x3d8a2a0 <my_charset_bin>, 
        m_alloced_length = 0, 
        m_is_alloced = false
      }, 
      item_name = {
        <Name_string> = {
          <Simple_cstring> = {
            m_str = 0x7f847c014a38 "employee_id", 
            m_length = 11
          }, <No data fields>}, 
        members of Item_name_string: 
        m_is_autogenerated = true
      }, 
      orig_name = {
        <Name_string> = {
          <Simple_cstring> = {
            m_str = 0x0, 
            m_length = 0
          }, <No data fields>}, 
        members of Item_name_string: 
        m_is_autogenerated = true
      }, 
      next = 0x7f847c014a48, 
      max_length = 0, 
      marker = 0, 
      decimals = 0 '\000', 
      maybe_null = 0 '\000', 
      null_value = 0 '\000', 
      unsigned_flag = 0 '\000', 
      with_sum_func = 0 '\000', 
      fixed = 0 '\000', 
      collation = {
---Type <return> to continue, or q <return> to quit---
        collation = 0x3d8a2a0 <my_charset_bin>, 
        derivation = DERIVATION_IMPLICIT, 
        repertoire = 3
      }, 
      cmp_context = 4294967295, 
      runtime_item = false, 
      derived_used = false, 
      with_subselect = 0 '\000', 
      with_stored_program = 0 '\000', 
      tables_locked_cache = false, 
      is_parser_item = true
    }, 
    members of Item_ident: 
    orig_db_name = 0x0, 
    orig_table_name = 0x7f847c014a30 "b", 
    orig_field_name = 0x7f847c014a38 "employee_id", 
    m_alias_of_expr = false, 
    context = 0x7f847c013f90, 
    db_name = 0x0, 
    table_name = 0x7f847c014a30 "b", 
    field_name = 0x7f847c014a38 "employee_id", 
    cached_field_index = 4294967295, 
    cached_table = 0x0, 
    depended_from = 0x0
  }, 
  members of Item_field: 
  table_ref = 0x0, 
  field = 0x0, 
  result_field = 0x0, 
  item_equal = 0x0, 
  no_const_subst = false, 
  have_privileges = 0, 
  any_privileges = false
}

(gdb) bt
#0  Item_func::set_arguments (this=0x7f847c0156d8, list=..., context_free=true) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:97
#1  0x0000000001d5e0db in Item_func::Item_func (this=0x7f847c0156d8, pos=..., opt_list=0x7f847c014bb8) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:134
#2  0x0000000001d758f8 in Item_func_sp::Item_func_sp (this=0x7f847c0156d8, pos=..., db_name=..., fn_name=..., use_explicit_name=false, opt_list=0x7f847c014bb8)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:8374
#3  0x0000000001d47ed7 in Create_sp_func::create (this=0x3e0aff0 <Create_sp_func::s_singleton>, thd=0x7f847c010540, db=..., name=..., use_explicit_name=false, item_list=0x7f847c014bb8)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:4255
#4  0x0000000001d47a0a in Create_qfunc::create_func (this=0x3e0aff0 <Create_sp_func::s_singleton>, thd=0x7f847c010540, name=..., item_list=0x7f847c014bb8)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/item_:4187
#5  0x0000000002413c9c in PTI_function_call_generic_ident_sys::itemize (this=0x7f847c014be8, pc=0x7f8665d27630, res=0x7f847c014d38)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_items.h:350
#6  0x00000000024b77b2 in PTI_expr_with_alias::itemize (this=0x7f847c014ca0, pc=0x7f8665d27630, res=0x7f8665d26a08)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_:186
#7  0x000000000240a2bf in PT_item_list::contextualize (this=0x7f847c0149f0, pc=0x7f8665d27630) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_helpers.h:77
#8  0x000000000240c761 in PT_select_item_list::contextualize (this=0x7f847c0149f0, pc=0x7f8665d27630) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_nodes.h:190
#9  0x0000000002410ed9 in PT_select_options_and_item_list::contextualize (this=0x7f847c014d70, pc=0x7f8665d27630)
    at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_nodes.h:2182
#10 0x00000000024110e1 in PT_select_part2::contextualize (this=0x7f847c015510, pc=0x7f8665d27630) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_nodes.h:2252
#11 0x0000000002411717 in PT_select_init2::contextualize (this=0x7f847c015578, pc=0x7f8665d27630) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_nodes.h:2377
#12 0x00000000024118a7 in PT_select::contextualize (this=0x7f847c015598, pc=0x7f8665d27630) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/parse_tree_nodes.h:2414
#13 0x0000000002416489 in MYSQLparse (YYTHD=0x7f847c010540) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_yacc.yy:1707
#14 0x0000000002302e46 in parse_sql (thd=0x7f847c010540, parser_state=0x7f8665d2af00, creation_ctx=0x0) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:7178
#15 0x00000000022fffba in mysql_parse (thd=0x7f847c010540, parser_state=0x7f8665d2af00) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:5501
#16 0x00000000022f6878 in dispatch_command (thd=0x7f847c010540, com_data=0x7f8665d2b660, command=COM_QUERY) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:1495
#17 0x00000000022f5a1b in do_command (thd=0x7f847c010540) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/sql_:1034
#18 0x00000000023f995b in handle_connection (arg=0x6903780) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/sql/conn_handler/connection_handler_per_:313
#19 0x0000000002915591 in pfs_spawn_thread (arg=0x6947e30) at /home/jenkins/workspace/stonedb5.7-zsl-centos7.9-75-128/storage/perfschema/:2197
#20 0x00007f86b0cfeea5 in start_thread () from /lib64/libpthread.so.0
#21 0x00007f86ae222b0d in clone () from /lib64/libc.so.6

(gdb) p *(Item_field*)tmp_arg[0]
$102 = {
  <Item_ident> = {
    <Item> = {
      <Parse_tree_node> = {
        _vptr.Parse_tree_node = 0x3c65f40 <vtable for Parse_tree_node+16>
      }, 
      members of Item: 
      is_expensive_cache = -1 '\377', 
      rsize = 0, 
      str_value = {
        m_ptr = 0x0, 
        m_length = 0, 
        m_charset = 0x3d8a2a0 <my_charset_bin>, 
        m_alloced_length = 0, 
        m_is_alloced = false
      }, 
      item_name = {
        <Name_string> = {
          <Simple_cstring> = {
            m_str = 0x7f847c014a38 "employee_id", 
            m_length = 11
          }, <No data fields>}, 
        members of Item_name_string: 
        m_is_autogenerated = true
      }, 
      orig_name = {
        <Name_string> = {
          <Simple_cstring> = {
            m_str = 0x0, 
            m_length = 0
          }, <No data fields>}, 
        members of Item_name_string: 
        m_is_autogenerated = true
      }, 
      next = 0x7f847c014a48, 
      max_length = 11, 
      marker = 0, 
      decimals = 0 '\000', 
      maybe_null = 1 '\001', 
      null_value = 0 '\000', 
      unsigned_flag = 0 '\000', 
      with_sum_func = 0 '\000', 
      fixed = 0 '\000', 
      collation = {
---Type <return> to continue, or q <return> to quit---
        collation = 0x3d922c0 <my_charset_latin1>, 
        derivation = DERIVATION_NUMERIC, 
        repertoire = 1
      }, 
      cmp_context = 4294967295, 
      runtime_item = false, 
      derived_used = false, 
      with_subselect = 0 '\000', 
      with_stored_program = 0 '\000', 
      tables_locked_cache = false, 
      is_parser_item = true
    }, 
    members of Item_ident: 
    orig_db_name = 0x0, 
    orig_table_name = 0x7f847c014a30 "b", 
    orig_field_name = 0x7f847c014a38 "employee_id", 
    m_alias_of_expr = false, 
    context = 0x7f847c013f90, 
    db_name = 0x0, 
    table_name = 0x7f847c014a30 "b", 
    field_name = 0x7f847c014a38 "employee_id", 
    cached_field_index = 0, 
    cached_table = 0x7f847c04c5b8, 
    depended_from = 0x0
  }, 
  members of Item_field: 
  table_ref = 0x0, 
  field = 0x0, 
  result_field = 0x0, 
  item_equal = 0x0, 
  no_const_subst = false, 
  have_privileges = 0, 
  any_privileges = false
}

(gdb) p *item
$127 = {
  <Parse_tree_node> = {
    _vptr.Parse_tree_node = 0x3d1a578 <vtable for PTI_udf_expr+16>
  }, 
  members of Item: 
  is_expensive_cache = -1 '\377', 
  rsize = 0, 
  str_value = {
    m_ptr = 0x0, 
    m_length = 0, 
    m_charset = 0x3d8a2a0 <my_charset_bin>, 
    m_alloced_length = 0, 
    m_is_alloced = false
  }, 
  item_name = {
    <Name_string> = {
      <Simple_cstring> = {
        m_str = 0x0, 
        m_length = 0
      }, <No data fields>}, 
    members of Item_name_string: 
    m_is_autogenerated = true
  }, 
  orig_name = {
    <Name_string> = {
      <Simple_cstring> = {
        m_str = 0x0, 
        m_length = 0
      }, <No data fields>}, 
    members of Item_name_string: 
    m_is_autogenerated = true
  }, 
  next = 0x7f847c0156d8, 
  max_length = 0, 
  marker = 0, 
  decimals = 0 '\000', 
  maybe_null = 0 '\000', 
  null_value = 0 '\000', 
  unsigned_flag = 0 '\000', 
  with_sum_func = 0 '\000', 
  fixed = 0 '\000', 
  collation = {
    collation = 0x3d8a2a0 <my_charset_bin>, 
    derivation = DERIVATION_COERCIBLE, 
---Type <return> to continue, or q <return> to quit---
    repertoire = 3
  }, 
  cmp_context = 4294967295, 
  runtime_item = false, 
  derived_used = false, 
  with_subselect = 0 '\000', 
  with_stored_program = 0 '\000', 
  tables_locked_cache = false, 
  is_parser_item = true
}

(gdb) p *(Item_field*)args[0]
$180 = {
  <Item_ident> = {
    <Item> = {
      <Parse_tree_node> = {
        _vptr.Parse_tree_node = 0x3c704d8 <vtable for Item_field+16>
      }, 
      members of Item: 
      is_expensive_cache = -1 '\377', 
      rsize = 0, 
      str_value = {
        m_ptr = 0x0, 
        m_length = 0, 
        m_charset = 0x3d8a2a0 <my_charset_bin>, 
        m_alloced_length = 0, 
        m_is_alloced = false
      }, 
      item_name = {
        <Name_string> = {
          <Simple_cstring> = {
            m_str = 0x7f847c014a38 "employee_id", 
            m_length = 11
          }, <No data fields>}, 
        members of Item_name_string: 
        m_is_autogenerated = true
      }, 
      orig_name = {
        <Name_string> = {
          <Simple_cstring> = {
            m_str = 0x0, 
            m_length = 0
          }, <No data fields>}, 
        members of Item_name_string: 
        m_is_autogenerated = true
      }, 
      next = 0x7f847c014a48, 
      max_length = 11, 
      marker = 0, 
      decimals = 0 '\000', 
      maybe_null = 1 '\001', 
      null_value = 0 '\000', 
      unsigned_flag = 0 '\000', 
      with_sum_func = 0 '\000', 
      fixed = 1 '\001', 
      collation = {
---Type <return> to continue, or q <return> to quit---
        collation = 0x3d922c0 <my_charset_latin1>, 
        derivation = DERIVATION_NUMERIC, 
        repertoire = 1
      }, 
      cmp_context = 4294967295, 
      runtime_item = false, 
      derived_used = false, 
      with_subselect = 0 '\000', 
      with_stored_program = 0 '\000', 
      tables_locked_cache = false, 
      is_parser_item = true
    }, 
    members of Item_ident: 
    orig_db_name = 0x0, 
    orig_table_name = 0x7f847c014a30 "b", 
    orig_field_name = 0x7f847c014a38 "employee_id", 
    m_alias_of_expr = false, 
    context = 0x7f847c013f90, 
    db_name = 0x7f847c016550 "t2", 
    table_name = 0x7f847c024390 "b", 
    field_name = 0x7f847c0169e9 "employee_id", 
    cached_field_index = 0, 
    cached_table = 0x7f847c01d198, 
    depended_from = 0x0
  }, 
  members of Item_field: 
  table_ref = 0x7f847c01d198, 
  field = 0x7f847c025630, 
  result_field = 0x7f847c025630, 
  item_equal = 0x0, 
  no_const_subst = false, 
  have_privileges = 0, 
  any_privileges = false
}

(gdb) p  *(*(Item_field*)args[0]).field
$25 = {
  <Proto_field> = {
    _vptr.Proto_field = 0x3c63ed0 <vtable for Field_long+16>
  }, 
  members of Field: 
  ptr = 0x7f847c092d71 "M", 
  m_null_ptr = 0x0, 
  m_is_tmp_nullable = false, 
  m_is_tmp_null = false, 
  m_count_cuted_fields_saved = (unknown: 1634652180), 
  table = 0x7f847c0923c0, 
  orig_table = 0x7f847c0923c0, 
  table_name = 0x7f847c0924b0, 
  field_name = 0x7f847c047c59 "employee_id", 
  comment = {
    str = 0x3062fd1 "", 
    length = 0
  }, 
  key_start = {
    map = 0
  }, 
  part_of_key = {
    map = 0
  }, 
  part_of_sortkey = {
    map = 0
  }, 
  part_of_key_not_extended = {
    map = 0
  }, 
  unireg_check = Field::NONE, 
  field_length = 11, 
  flags = 1, 
  field_index = 0, 
  null_bit = 0 '\000', 
  is_created_from_null_item = false, 
  m_indexed = false, 
  m_warnings_pushed = 0, 
  gcol_info = 0x0, 
  stored_in_db = true
}