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MDEV-12143 sql_mode=ORACLE: make the CONCAT function ignore NULL arguments

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This commit is contained in:
Alexander Barkov 2017-02-27 17:47:06 +04:00
parent 915c5df865
commit 839e0947ee
4 changed files with 42 additions and 1 deletions
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34
mysql-test/suite/compat/oracle/r/func_concat.result
View file

@ -4,6 +4,11 @@ id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select 'a' || 'b' || 'c' AS "'a'||'b'||'c'"
EXPLAIN EXTENDED SELECT CONCAT('a'||'b'||'c');
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select 'a' || 'b' || 'c' AS "CONCAT('a'||'b'||'c')"
SELECT '' || '';
'' || ''
@ -169,4 +174,33 @@ NULL NULL
2 ab
2 ab
3 abc
SELECT LENGTH(CONCAT(a||b||c)), CONCAT(a||b||c) FROM t1 ORDER BY a,b,c;
LENGTH(CONCAT(a||b||c)) CONCAT(a||b||c)
NULL NULL
0
1 c
0
0
1 c
1 b
1 b
2 bc
0
0
1 c
0
0
1 c
1 b
1 b
2 bc
1 a
1 a
2 ac
1 a
1 a
2 ac
2 ab
2 ab
3 abc
DROP TABLE t1;

2
mysql-test/suite/compat/oracle/t/func_concat.test
View file

@ -5,6 +5,7 @@
SET sql_mode=ORACLE;
EXPLAIN EXTENDED SELECT 'a'||'b'||'c';
EXPLAIN EXTENDED SELECT CONCAT('a'||'b'||'c');
SELECT '' || '';
SELECT '' || 'b';
@ -79,5 +80,6 @@ INSERT INTO t1 VALUES (NULL, NULL, 'c');
INSERT INTO t1 VALUES (NULL, NULL, NULL);
SELECT LENGTH(a||b||c), a||b||c FROM t1 ORDER BY a,b,c;
SELECT LENGTH(CONCAT(a||b||c)), CONCAT(a||b||c) FROM t1 ORDER BY a,b,c;
DROP TABLE t1;

4
sql/item_create.cc
View file

@ -3857,7 +3857,9 @@ Create_func_concat::create_native(THD *thd, LEX_STRING name,
return NULL;
}
return new (thd->mem_root) Item_func_concat(thd, *item_list);
return thd->variables.sql_mode & MODE_ORACLE ?
new (thd->mem_root) Item_func_concat_operator_oracle(thd, *item_list) :
new (thd->mem_root) Item_func_concat(thd, *item_list);
}
Create_func_decode_histogram Create_func_decode_histogram::s_singleton;

3
sql/item_strfunc.h
View file

@ -297,6 +297,9 @@ public:
class Item_func_concat_operator_oracle :public Item_func_concat
{
public:
Item_func_concat_operator_oracle(THD *thd, List<Item> &list)
:Item_func_concat(thd, list)
{ }
Item_func_concat_operator_oracle(THD *thd, Item *a, Item *b)
:Item_func_concat(thd, a, b)
{ }