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MDEV-5816: Stored programs: validation of stored program statements

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For those SP instructions that need to get access to ia LEX object
on execution, added storing of their original sql expressions inside
classes derived from the class sp_lex_instr.

A stored sql expression is returned by the abstract method
  sp_lex_instr::get_expr_query
redefined in derived classes.

Since an expression constituting a SP instruction can be invalid
SQL statement in general case (not parseable statement), the virtual
method sp_lex_instr::get_query() is introduced to return a valid string
for a statement that corresponds to the given instruction.

Additionally, introduced the rule remember_start_opt in the grammar.
The new rule intended to get correct position of a current
token taking into attention the fact whether lookahead was done or not.
This commit is contained in:
Dmitry Shulga
2023-07-19 17:53:55 +07:00
parent 6840af6e01
commit 5a8b9a16d1
11 changed files with 606 additions and 193 deletions
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16
sql/sql_class.h
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@ -8035,5 +8035,21 @@ public:
}
};
/**
Make a new string allocated on THD's mem-root.
@param thd thread handler.
@param start_ptr start of the new string.
@param end_ptr end of the new string.
@return LEX_CSTRING object, containing a pointer to a newly
constructed/allocated string, and its length. The data member
LEX_CSTRING::str has the value nullptr in case of out-of-memory error.
*/
LEX_CSTRING make_string(THD *thd, const char *start_ptr,
const char *end_ptr);
#endif /* MYSQL_SERVER */
#endif /* SQL_CLASS_INCLUDED */