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MDEV-10574 / SUBSTR - sql_mode=Oracle: return null instead of empty string

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halfspawn
2018-03-13 10:34:28 +01:00
parent 1c4b6afbaa
commit 3e6893e29a
3 changed files with 75 additions and 12 deletions
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47
mysql-test/suite/compat/oracle/r/func_substr.result
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@ -1,3 +1,7 @@
#
# MDEV-14012 - sql_mode=Oracle: substr(): treat position 0 as position 1
# MDEV-10574 - sql_mode=Oracle: return null instead of empty string
#
SET sql_mode=ORACLE;
SELECT SUBSTR('abc',2,1),SUBSTR('abc',1,1), SUBSTR('abc',0,1) FROM dual;
SUBSTR('abc',2,1) SUBSTR('abc',1,1) SUBSTR('abc',0,1)
@ -22,19 +26,52 @@ SUBSTR('abc',2,null) SUBSTR('abc',1,null) SUBSTR('abc',0,null)
NULL NULL NULL
SELECT SUBSTR('abc',2,0),SUBSTR('abc',1,0), SUBSTR('abc',0,0) FROM dual;
SUBSTR('abc',2,0) SUBSTR('abc',1,0) SUBSTR('abc',0,0)
create table t1 (c1 varchar(10),start integer, length integer);
NULL NULL NULL
SELECT SUBSTR('abc',2,-1),SUBSTR('abc',1,-1), SUBSTR('abc',0,-1) FROM dual;
SUBSTR('abc',2,-1) SUBSTR('abc',1,-1) SUBSTR('abc',0,-1)
NULL NULL NULL
SELECT SUBSTR(SPACE(0),1) FROM DUAL;
SUBSTR(SPACE(0),1)
NULL
CREATE TABLE t1 (c1 VARCHAR(10),start INTEGER, length INTEGER);
INSERT INTO t1 VALUES ('abc', 1, 1);
INSERT INTO t1 VALUES ('abc', 0, 1);
INSERT INTO t1 VALUES (null, 1, 1);
INSERT INTO t1 VALUES (null, 0, 1);
select substr(c1,start,length) from t1;
substr(c1,start,length)
INSERT INTO t1 VALUES ('abc', 1, 0);
INSERT INTO t1 VALUES ('abc', 0, 0);
INSERT INTO t1 VALUES (null, 1, 0);
INSERT INTO t1 VALUES (null, 0, 0);
INSERT INTO t1 VALUES ('abc', 1, -1);
INSERT INTO t1 VALUES ('abc', 0, -1);
INSERT INTO t1 VALUES (null, 1, -1);
INSERT INTO t1 VALUES (null, 0, -1);
INSERT INTO t1 VALUES (SPACE(0), 0, 1);
SELECT SUBSTR(c1,start,length) FROM t1;
SUBSTR(c1,start,length)
a
a
NULL
NULL
drop table t1;
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
NULL
DROP TABLE t1;
CREATE TABLE t1 (c1 VARCHAR(10) NOT NULL);
CREATE TABLE t2 AS SELECT SUBSTR(C1,1,1) AS C1 from t1;
SHOW CREATE TABLE t2;
Table Create Table
t2 CREATE TABLE "t2" (
"C1" varchar(1) DEFAULT NULL
)
DROP TABLE t2;
DROP TABLE t1;
EXPLAIN EXTENDED SELECT SUBSTR('abc',2,1) ;
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