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Setting a variable to CAST(NULL as X) set the result type of the variable to X. (Bug #6598)

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mysql-test/r/bigint.result:
  Test to show show that the parser threats big longlong values as unsigned
mysql-test/r/user_var.result:
  Test of CAST(NULL as SIGNED/UNSIGNED)
mysql-test/t/bigint.test:
  Test to show show that the parser threats big longlong values as unsigned
mysql-test/t/user_var.test:
  Test of CAST(NULL as SIGNED/UNSIGNED)
sql/item_func.cc:
  Setting a variable to CAST(NULL as X) set the result type of the variable to X. (Bug #6598)
  Setting a variable to NULL doesn't change the old result type.
sql/item_func.h:
  Detect setting a variable to NULL
sql/unireg.cc:
  Safety fix
This commit is contained in:
unknown
2005-04-30 03:14:42 +03:00
parent 8b5b3652ec
commit ac82a2d5eb
7 changed files with 111 additions and 6 deletions
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26
mysql-test/t/user_var.test
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@@ -119,3 +119,29 @@ select coercibility(@v1),coercibility(@v2),coercibility(@v3),coercibility(@v4);
set session @honk=99;
--error 1382
set one_shot @honk=99;
#
# Bug #6598: problem with cast(NULL as signed integer);
#
set @first_var= NULL;
create table t1 select @first_var;
show create table t1;
drop table t1;
set @first_var= cast(NULL as signed integer);
create table t1 select @first_var;
show create table t1;
drop table t1;
set @first_var= NULL;
create table t1 select @first_var;
show create table t1;
drop table t1;
set @first_var= concat(NULL);
create table t1 select @first_var;
show create table t1;
drop table t1;
set @first_var=1;
set @first_var= cast(NULL as CHAR);
create table t1 select @first_var;
show create table t1;
drop table t1;