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MDEV-10342 Providing compatibility for basic SQL built-in functions

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Adding the Oracle style DECODE function:

  DECODE(operand, search, result [, search, result ...] [, default_result])
This commit is contained in:
Alexander Barkov
2016-09-19 11:39:36 +04:00
parent 02a72cf87c
commit c8822d71ef
8 changed files with 119 additions and 23 deletions
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33
mysql-test/suite/compat/oracle/r/func_decode.result Normal file
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SET sql_mode=ORACLE;
SELECT DECODE(10);
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1
SELECT DECODE(10,10);
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ')' at line 1
SELECT DECODE(10,10,'x10');
DECODE(10,10,'x10')
x10
SELECT DECODE(11,10,'x10');
DECODE(11,10,'x10')
NULL
SELECT DECODE(10,10,'x10','def');
DECODE(10,10,'x10','def')
x10
SELECT DECODE(11,10,'x10','def');
DECODE(11,10,'x10','def')
def
SELECT DECODE(10,10,'x10',11,'x11','def');
DECODE(10,10,'x10',11,'x11','def')
x10
SELECT DECODE(11,10,'x10',11,'x11','def');
DECODE(11,10,'x10',11,'x11','def')
x11
SELECT DECODE(12,10,'x10',11,'x11','def');
DECODE(12,10,'x10',11,'x11','def')
def
EXPLAIN EXTENDED SELECT DECODE(12,10,'x10',11,'x11','def');
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 (case 12 when 10 then 'x10' when 11 then 'x11' else 'def' end) AS "DECODE(12,10,'x10',11,'x11','def')"
CREATE TABLE decode (decode int);
DROP TABLE decode;