[MDEV-19502] TIME_ROUND_FRACTIONAL is not respected on TIME->BIGINT conversion Created: 2019-05-17  Updated: 2019-05-17

Status: Open
Project: MariaDB Server
Component/s: Data types
Affects Version/s: 10.4
Fix Version/s: 10.4

Type: Bug Priority: Major
Reporter: Alexander Barkov Assignee: Alexander Barkov
Resolution: Unresolved Votes: 0
Labels: Compatibility, compat57

Issue Links:
Relates
relates to MDEV-16991 Rounding vs truncation for TIME, DATE... Closed
relates to MDEV-8919 Wrong result for CAST(999999999999999... Closed

 Description   

MySQL rounds fractional seconds on implicit TIME->BIGINT conversion and on explicit CAST:

SET sql_mode=''; -- MySQL rounds by default
 
DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (a BIGINT);
 
INSERT INTO t1 VALUES (TIME'-00:00:01.6');
 
SELECT a, CAST(TIME'-00:00:01.6' AS SIGNED) FROM t1;


+------+-----------------------------------+
 
| a    | CAST(TIME'-00:00:01.6' AS SIGNED) |
 
+------+-----------------------------------+
 
|   -2 |                                -2 |
 
+------+-----------------------------------+

MariaDB truncates:

SET sql_mode='TIME_ROUND_FRACTIONAL';
 
DROP TABLE IF EXISTS t1;
 
CREATE TABLE t1 (a BIGINT);
 
INSERT INTO t1 VALUES (TIME'-00:00:01.6');
 
SELECT a, CAST(TIME'-00:00:01.6' AS SIGNED) FROM t1;


+------+-----------------------------------+
 
| a    | CAST(TIME'-00:00:01.6' AS SIGNED) |
 
+------+-----------------------------------+
 
|   -1 |                                -1 |
 
+------+-----------------------------------+


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