Lemon (the sqlite parser generator) destructors are needed for
all rules that return dynamically allocated structures. Otherwise
there may be leaks if a statement is not completely parsed.
With this change, both 'SET @my_id = (SELECT LAST_INSERT_ID())' and
'SET @my_id = (SELECT @@LAST_INSERT_ID)' are classified as
QUERY_TYPE_MASTER_READ|QUERY_TYPE_SESSION_WRITE|QUERY_TYPE_USERVAR_WRITE
Earlier @@last_insert_id had the QUERY_TYPE_READ bit set as well, which
indirectly caused the problems of MXS-2898.
DIV and MOD are now also accepted instead of / and % respectively.
MOD is a keyword but (in principle incorrectly) decays into an id
when used in some other context. That is so that it will be
parser by the general function rule ("id ( ... )"). If used
incorrectly, the server will later reject.
In the tokenizer we will now recognize the character set names
of MariaDB and return a specific token for those. However, where
a character set name is not expected, it will automatically be
treated as an identifier.
Note that when the character set name is explicitly specified
for a literal string, the name must be prefixed with an underscore.
That is, if the character set name is "latin1", when used when
specifying a literal string, it's used as "_latin1 'a'".
Note that this does not fix the sqlite3 bug causing a leak, but
since the statement will now correctly be parsed, the leak will
not manifest itself.
The mkopcodeh.tcl of sqlite3 version 3110100 has a bug that
manifests itself so that it generates broken code depending on
what keywords there are and in what order. The mkopcodeh.tcl
from 3200000 does not have that problem.
Originally, the sqlite installation was imported into the MaxScale
repository in the one gigantic MaxScale 1.4 -> 2.0 commit.
Consequently, there is no import commit to compare to if you want
to extract all MaxScale specific changes. To make it simpler in the
future, sqlite will now be imported in a commit of its own.
The purpose is to recognize e.g. /_utf8mb4 0xD091D092D093/ as
a valid string. The rule actually accepts /id integer/, but in
case the statement is something else but an '_' immediately
followed by a character set, followed by a hex number, it will
be rejected by the server so no harm done.
With this change, a parenthesized top-level SELECT, such as
"(SELECT f FROM t)" will be fully parsed. Before this change,
the statement was classified as invalid and would thus have
been sent to the master.
With this change also statements like
(SELECT f FROM t1) UNION (SELECT f FROM t2)
will be correctly classified, although only partially parsed.
With these changes
SET @saved_cs_client= @@character_set_client;
will be classified as QUERY_TYPE_USERVAR_WRITE and
SELECT 1 AS c1 FROM t1 ORDER BY ( SELECT 1 AS c2 FROM
t1 GROUP BY GREATEST(LAST_INSERT_ID(), t1.a) ORDER BY
GREATEST(LAST_INSERT_ID(), t1.a) LIMIT 1);
will be classified as QUERY_TYPE_READ|QUERY_TYPE_MASTER_READ
With this change, a parenthesized top-level SELECT, such as
"(SELECT f FROM t)" will be fully parsed. Before this change,
the statement was classified as invalid and would thus have
been sent to the master.
With this change also statements like
(SELECT f FROM t1) UNION (SELECT f FROM t2)
will be correctly classified, although only partially parsed.
