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1. When mixing NULL to a character string,

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the result takes its charset/collation
attributes from the character string,
e.g.  SELECT func(NULL, _latin2'string')
now returns a latin2 result. This is
done by introducing a new derivation
(aka coercibility) level DERIVATION_IGNORABLE,
which is used with Item_null.
2. 'Pure' NULL is now BINARY(0), not CHAR(0).
I.e. NULL is now more typeless.


mysql-test/r/metadata.result:
  Fixing test results:
  CHAR(0) -> BINARY(0) for NULLs
mysql-test/r/null.result:
  Testing mixing NULL with a character string with a number of functions.
mysql-test/r/ps_2myisam.result:
  Fixing test results:
  CHAR(0) -> BINARY(0) for NULLs
mysql-test/r/ps_3innodb.result:
  Fixing test results:
  CHAR(0) -> BINARY(0) for NULLs
mysql-test/r/ps_4heap.result:
  Fixing test results:
  CHAR(0) -> BINARY(0) for NULLs
mysql-test/r/ps_5merge.result:
  Fixing test results:
  CHAR(0) -> BINARY(0) for NULLs
mysql-test/r/ps_6bdb.result:
  Fixing test results:
  CHAR(0) -> BINARY(0) for NULLs
mysql-test/r/ps_7ndb.result:
  Fixing test results:
  CHAR(0) -> BINARY(0) for NULLs
mysql-test/t/null.test:
  Testing mixing NULL with a character string with a number of functions.
sql/item.cc:
  New derivation level.
sql/item.h:
  New derivation level.
This commit is contained in:
unknown 2004-11-10 14:05:28 +04:00
commit c5e6941e75
11 changed files with 181 additions and 17 deletions
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8
mysql-test/r/ps_5merge.result
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@ -1713,7 +1713,7 @@ t5 CREATE TABLE `t5` (
`param10` bigint(20) default NULL,
`const11` int(4) default NULL,
`param11` bigint(20) default NULL,
`const12` char(0) default NULL,
`const12` binary(0) default NULL,
`param12` bigint(20) default NULL,
`param13` double default NULL,
`param14` longtext,
@ -1743,7 +1743,7 @@ def test t5 t5 const10 const10 3 10 9 N 32769 0 63
def test t5 t5 param10 param10 8 20 9 Y 32768 0 63
def test t5 t5 const11 const11 3 4 4 Y 32768 0 63
def test t5 t5 param11 param11 8 20 4 Y 32768 0 63
def test t5 t5 const12 const12 254 0 0 Y 0 0 8
def test t5 t5 const12 const12 254 0 0 Y 128 0 63
def test t5 t5 param12 param12 8 20 0 Y 32768 0 63
def test t5 t5 param13 param13 5 20 0 Y 32768 31 63
def test t5 t5 param14 param14 252 16777215 0 Y 16 0 8
@ -4723,7 +4723,7 @@ t5 CREATE TABLE `t5` (
`param10` bigint(20) default NULL,
`const11` int(4) default NULL,
`param11` bigint(20) default NULL,
`const12` char(0) default NULL,
`const12` binary(0) default NULL,
`param12` bigint(20) default NULL,
`param13` double default NULL,
`param14` longtext,
@ -4753,7 +4753,7 @@ def test t5 t5 const10 const10 3 10 9 N 32769 0 63
def test t5 t5 param10 param10 8 20 9 Y 32768 0 63
def test t5 t5 const11 const11 3 4 4 Y 32768 0 63
def test t5 t5 param11 param11 8 20 4 Y 32768 0 63
def test t5 t5 const12 const12 254 0 0 Y 0 0 8
def test t5 t5 const12 const12 254 0 0 Y 128 0 63
def test t5 t5 param12 param12 8 20 0 Y 32768 0 63
def test t5 t5 param13 param13 5 20 0 Y 32768 31 63
def test t5 t5 param14 param14 252 16777215 0 Y 16 0 8