database/mariadb-columnstore-engine
1
0
Fork 0
mirror of https://github.com/mariadb-corporation/mariadb-columnstore-engine.git synced 2025-07-30 19:23:07 +03:00
Code Activity

MCOL-271 empty strings should not be NULLs (#2794)

Browse Source 
This patch improves handling of NULLs in textual fields in ColumnStore.
Previously empty strings were considered NULLs and it could be a problem
if data scheme allows for empty strings. It was also one of major
reasons of behavior difference between ColumnStore and other engines in
MariaDB family.

Also, this patch fixes some other bugs and incorrect behavior, for
example, incorrect comparison for "column <= ''" which evaluates to
constant True for all purposes before this patch.
This commit is contained in:
Sergey Zefirov
2023-03-30 17:26:45 +01:00
committed by Roman Nozdrin
parent 0ea592da80
commit b53c231ca6
417 changed files with 12459 additions and 3520 deletions
Download Patch File Download Diff File Expand all files Collapse all files

32
mysql-test/columnstore/basic/t/regr-fe-conv.test Normal file
View File

@ -0,0 +1,32 @@
--source ../include/have_columnstore.inc
--disable_warnings
DROP DATABASE IF EXISTS regr_fe_conv;
--enable_warnings
CREATE DATABASE regr_fe_conv;
USE regr_fe_conv;
--disable_query_log
--source ../include/regression_create_dtypes.inc
--enable_query_log
select conv(dt, -10, -8) from dtypes where conv(dt, -10, -8) > 3731;
select dtm from dtypes where conv(dtm, -10, -8) > 3731 order by dtm, conv(dtm, 10, 8);
select conv(db, 10, 16), conv(ti, 8,16), conv(si, 16, 8), conv(i, 4, 8), conv(bi, 10, 8) from dtypes;
select conv (c1, 5, 10), conv(substr(c8,2,4), 8, 10), conv(concat(vc1, vc2), 10,8) from dtypes;
select substr(vc255,2,3), conv(substr(vc255,2,3),16,10) from dtypes where id < 50 ;
#select conv(max(d182), 10, 20) from dtypes;
#select conv(bi, 10, 24) from dtypes where id < 20;
select conv (c1, 5, 2), conv(substr(c8,2,4), 8, 2), conv(concat(vc1, vc2), 10, 2) from dtypes;
--disable_warnings
drop table if exists bug3509;
--enable_warnings
create table bug3509 (cookie varchar(32), d_datekey date) engine=columnstore;
insert into bug3509 values ('f48d2dce907ce3c54a9c12855754c0b5', 19980404);
select conv(substr(cookie,1,12),16,10), conv(substr(cookie,1,16),16,10), conv(substr(cookie,1,16),18,10) from bug3509;
drop table bug3509;
DROP DATABASE regr_fe_conv;