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mariadb/sql
Sergei Petrunia 2ed5f627f2 Move parse-only LEX members into LEX_Parser_state and trash it after parsing
Introduce struct LEX_Parser_state and make LEX inherit from it. It holds the
members that are used only while a statement is being parsed: the select and
WITH-clause stacks, FK/key/option building state, window-spec scratch fields,
parsing_options, lex_options and a few parser flags.

LEX::start() now resets them through LEX_Parser_state::reset_parser_state(),
which initializes every member (several were never reset before).

parse_sql() marks the structure with TRASH_FREE() once parsing is done, so
that any code that still reads parser-only state after parsing is caught.
reset_parser_state() makes the memory addressable again for the next
statement.

Members that look parse-only but are used after parsing (with_clauses_list,
context_stack, select_stack_top, has_returning_list, clause_winfuncs) stay in
LEX.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>
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