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MDEV-18553: MDEV-16327 pre-requisits part 2: uniform of LIMIT/OFFSET handling

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Now both offset and limit are stored and do not chenged during execution
(offset is decreased during processing in versions before 10.5).

(Big part of this changes made by Monty)
This commit is contained in:
Oleksandr Byelkin
2019-10-11 12:26:15 +02:00
parent eb0804ef5e
commit 1ae02f0e0d
14 changed files with 63 additions and 83 deletions
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8
sql/sql_class.h
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@ -5095,6 +5095,14 @@ class select_result_sink: public Sql_alloc
public:
THD *thd;
select_result_sink(THD *thd_arg): thd(thd_arg) {}
inline int send_data_with_check(List<Item> &items,
SELECT_LEX_UNIT *u,
ha_rows sent)
{
if (u->lim.check_offset(sent))
return 0;
return send_data(items);
}
/*
send_data returns 0 on ok, 1 on error and -1 if data was ignored, for
example for a duplicate row entry written to a temp table.