Method mark_broken

sql/sql_lex.h:2428–2444

Certain permanent transformations (like in2exists), if they fail, may leave the LEX in an inconsistent state. They should call the following function, so that this LEX is not reused by another execution. @todo If lex_start () were a member function of LEX, the "broken" argument could always be "true" and thus could be removed. */

     argument could always be "true" and thus could be removed.
  */
  void mark_broken(bool broken= true)
  {
    if (broken)
    {
      /*
        "OPEN <cursor>" cannot be re-prepared if the cursor uses no tables
        ("SELECT FROM DUAL"). Indeed in that case cursor_query is left empty
        in constructions of sp_instr_cpush, and thus
        sp_lex_instr::parse_expr() cannot re-prepare. So we mark the statement
        as broken only if tables are used.
      */
      if (is_metadata_used())
        m_broken= true;
    }
    else
      m_broken= false;
  }

  sp_pcontext *get_sp_current_parsing_ctx()
  { return sp_current_parsing_ctx; }