From: Peter Gulutzan <pgulutzan@ocelot.ca> To: Mergen Imeev <imeevma@tarantool.org>, tarantool-discussions@dev.tarantool.org, korablev@tarantool.org, Vladislav Shpilevoy <v.shpilevoy@tarantool.org>, tsafin@tarantool.org Subject: Re: [Tarantool-discussions] Implicit cast for assignment between numeric types and type mismatch error description. Date: Tue, 23 Jun 2020 13:42:06 -0600 [thread overview] Message-ID: <864ee43e-70d7-df03-02a8-882dcc4e6563@ocelot.ca> (raw) In-Reply-To: <8770c30c-b8f4-b9f5-e472-be9a967dc251@tarantool.org> Hi, On 2020-06-23 10:15 a.m., Mergen Imeev wrote: <cut> > Thanks for the answer. However, I now have another question: > should we apply these rules for cases like this: > SELECT * FROM t LIMIT 2.5; > > I mean, we should throw an error here or execute it like this: > SELECT * FROM t LIMIT 2; <cut> In the SQL-standard equivalent of LIMIT n, which is FETCH FIRST n ROWS, that is a syntax error because "The declared type of <fetch first row count> shall be an exact numeric with scale 0 (zero)." For us it is a runtime error ... " tarantool> n = 0.000000001 --- ... tarantool> box.execute([[SELECT 5 LIMIT ?;]], {n}) --- - null - 'Failed to execute SQL statement: Only positive integers are allowed in the LIMIT clause' ... " and you are proposing that there should be no error. On the other hand, box.execute([[CREATE TABLE t (s1 VARCHAR(2.0) PRIMARY KEY);]]) causes a "Syntax error", and you are not proposing that we change that. Another case is box.execute([[SELECT SUBSTR('abcde',2.99);]]) which is legal, 2.99 is truncated to 2. Therefore, I think your proposal means: If n is not an integer, and that is not detected as a syntax error, then there should be no error or warning. And I think the precedent of substr() means: there should be truncation not rounding. If I have understood correctly, then I agree. Peter Gulutzan
next prev parent reply other threads:[~2020-06-23 19:42 UTC|newest] Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-06-22 11:52 Mergen Imeev 2020-06-22 18:43 ` Peter Gulutzan 2020-06-23 16:15 ` Mergen Imeev 2020-06-23 19:42 ` Peter Gulutzan [this message] 2020-06-25 8:02 ` Mergen Imeev 2020-06-25 19:39 ` Peter Gulutzan
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