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lp:731124 Loss of precision on DISTINCT

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many changes:
* NOT_FIXED_DEC now create hires fields, not old ones.
  As a result, temp tables preserve microseconds (on DISTINCT, GROUP BY)
* I_S tables force decimals=0 on temporal types (backward compatibility)
* Item_func_coalesce calculates decimals for temporal types
* no precision for TIME/DATETIME in CAST means 0, not NOT_FIXED_DEC
* addtime/timediff calculate decimals from arguments (not NOT_FIXED_DEC)

sql/field.h:
  NOT_FIXED_DEC now create hires fields, not old ones
sql/item.h:
  force decimals=0 for I_S tables
sql/item_cmpfunc.cc:
  Item_func_coalesce calculates decimals for temporal types
sql/item_create.cc:
  no precision for TIME/DATETIME in CAST means 0, not NOT_FIXED_DEC
sql/item_timefunc.cc:
  addtime calculates decimals from arguments (not NOT_FIXED_DEC)
sql/item_timefunc.h:
  timediff calculates decimals from arguments (not NOT_FIXED_DEC)
This commit is contained in:
Sergei Golubchik
2011-03-08 19:41:58 +01:00
parent 2c80662d23
commit 8b7fd8f577
11 changed files with 64 additions and 32 deletions
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10
mysql-test/r/date_formats.result
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@ -196,16 +196,16 @@ date format datetime
0003-01-02 8:11:2.123456 %Y-%m-%d %H:%i:%S.%# 0003-01-02 08:11:02
03-01-02 8:11:2.123456 %Y-%m-%d %H:%i:%S.%# 2003-01-02 08:11:02
2003-01-02 10:11:12 PM %Y-%m-%d %h:%i:%S %p 2003-01-02 22:11:12
2003-01-02 01:11:12.12345AM %Y-%m-%d %h:%i:%S.%f%p 2003-01-02 01:11:12.123450
2003-01-02 02:11:12.12345AM %Y-%m-%d %h:%i:%S.%f %p 2003-01-02 02:11:12.123450
2003-01-02 12:11:12.12345 am %Y-%m-%d %h:%i:%S.%f%p 2003-01-02 00:11:12.123450
2003-01-02 01:11:12.12345AM %Y-%m-%d %h:%i:%S.%f%p 2003-01-02 01:11:12
2003-01-02 02:11:12.12345AM %Y-%m-%d %h:%i:%S.%f %p 2003-01-02 02:11:12
2003-01-02 12:11:12.12345 am %Y-%m-%d %h:%i:%S.%f%p 2003-01-02 00:11:12
2003-01-02 11:11:12Pm %Y-%m-%d %h:%i:%S%p 2003-01-02 23:11:12
10:20:10 %H:%i:%s 0000-00-00 10:20:10
10:20:10 %h:%i:%s.%f 0000-00-00 10:20:10
10:20:10 %T 0000-00-00 10:20:10
10:20:10AM %h:%i:%s%p 0000-00-00 10:20:10
10:20:10AM %r 0000-00-00 10:20:10
10:20:10.44AM %h:%i:%s.%f%p 0000-00-00 10:20:10.440000
10:20:10.44AM %h:%i:%s.%f%p 0000-00-00 10:20:10
15-01-2001 12:59:58 %d-%m-%Y %H:%i:%S 2001-01-15 12:59:58
15 September 2001 %d %M %Y 2001-09-15 00:00:00
15 SEPTEMB 2001 %d %M %Y 2001-09-15 00:00:00
@ -487,7 +487,7 @@ str_to_date(a,b)
create table t2 select str_to_date(a,b) from t1;
describe t2;
Field Type Null Key Default Extra
str_to_date(a,b) datetime YES NULL
str_to_date(a,b) datetime(6) YES NULL
select str_to_date("2003-01-02 10:11:12.0012", "%Y-%m-%d %H:%i:%S.%f") as f1,
str_to_date("2003-01-02 10:11:12.0012", "%Y-%m-%d %H:%i:%S") as f2,
str_to_date("2003-01-02", "%Y-%m-%d") as f3,