Commit e8e7fdb7 authored by Mats Kindahl's avatar Mats Kindahl
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Manual merge of mysql-5.0-bugteam -> mysql-5.1-bugteam

parents de35ca0d a129837f

mysql-test/r/parser.result

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mysql-test/r/parser.result.moved

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mysql-test/t/parser.test

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@@ -11,387 +11,6 @@ 
# even whitespace or comments, is significant here.

#



SET @save_sql_mode=@@sql_mode;



#

# Documenting the current behavior, to detect incompatible changes.

# In each cases:

# - no error is the correct result

# - an error is the expected result with the current implementation,

#   and is a limitation.



set SQL_MODE='';



create table ADDDATE(a int);

drop table ADDDATE;

create table ADDDATE (a int);

drop table ADDDATE;



--error ER_PARSE_ERROR

create table BIT_AND(a int);

create table BIT_AND (a int);

drop table BIT_AND;



--error ER_PARSE_ERROR

create table BIT_OR(a int);

create table BIT_OR (a int);

drop table BIT_OR;



--error ER_PARSE_ERROR

create table BIT_XOR(a int);

create table BIT_XOR (a int);

drop table BIT_XOR;



--error ER_PARSE_ERROR

create table CAST(a int);

create table CAST (a int);

drop table CAST;



--error ER_PARSE_ERROR

create table COUNT(a int);

create table COUNT (a int);

drop table COUNT;



--error ER_PARSE_ERROR

create table CURDATE(a int);

create table CURDATE (a int);

drop table CURDATE;



--error ER_PARSE_ERROR

create table CURTIME(a int);

create table CURTIME (a int);

drop table CURTIME;



--error ER_PARSE_ERROR

create table DATE_ADD(a int);

create table DATE_ADD (a int);

drop table DATE_ADD;



--error ER_PARSE_ERROR

create table DATE_SUB(a int);

create table DATE_SUB (a int);

drop table DATE_SUB;



--error ER_PARSE_ERROR

create table EXTRACT(a int);

create table EXTRACT (a int);

drop table EXTRACT;



--error ER_PARSE_ERROR

create table GROUP_CONCAT(a int);

create table GROUP_CONCAT (a int);

drop table GROUP_CONCAT;



# Limitation removed in 5.1

create table GROUP_UNIQUE_USERS(a int);

drop table GROUP_UNIQUE_USERS;

create table GROUP_UNIQUE_USERS (a int);

drop table GROUP_UNIQUE_USERS;



--error ER_PARSE_ERROR

create table MAX(a int);

create table MAX (a int);

drop table MAX;



--error ER_PARSE_ERROR

create table MID(a int);

create table MID (a int);

drop table MID;



--error ER_PARSE_ERROR

create table MIN(a int);

create table MIN (a int);

drop table MIN;



--error ER_PARSE_ERROR

create table NOW(a int);

create table NOW (a int);

drop table NOW;



--error ER_PARSE_ERROR

create table POSITION(a int);

create table POSITION (a int);

drop table POSITION;



create table SESSION_USER(a int);

drop table SESSION_USER;

create table SESSION_USER (a int);

drop table SESSION_USER;



--error ER_PARSE_ERROR

create table STD(a int);

create table STD (a int);

drop table STD;



--error ER_PARSE_ERROR

create table STDDEV(a int);

create table STDDEV (a int);

drop table STDDEV;



--error ER_PARSE_ERROR

create table STDDEV_POP(a int);

create table STDDEV_POP (a int);

drop table STDDEV_POP;



--error ER_PARSE_ERROR

create table STDDEV_SAMP(a int);

create table STDDEV_SAMP (a int);

drop table STDDEV_SAMP;



create table SUBDATE(a int);

drop table SUBDATE;

create table SUBDATE (a int);

drop table SUBDATE;



--error ER_PARSE_ERROR

create table SUBSTR(a int);

create table SUBSTR (a int);

drop table SUBSTR;



--error ER_PARSE_ERROR

create table SUBSTRING(a int);

create table SUBSTRING (a int);

drop table SUBSTRING;



--error ER_PARSE_ERROR

create table SUM(a int);

create table SUM (a int);

drop table SUM;



--error ER_PARSE_ERROR

create table SYSDATE(a int);

create table SYSDATE (a int);

drop table SYSDATE;



create table SYSTEM_USER(a int);

drop table SYSTEM_USER;

create table SYSTEM_USER (a int);

drop table SYSTEM_USER;



--error ER_PARSE_ERROR

create table TRIM(a int);

create table TRIM (a int);

drop table TRIM;



# Limitation removed in 5.1

create table UNIQUE_USERS(a int);

drop table UNIQUE_USERS;

create table UNIQUE_USERS (a int);

drop table UNIQUE_USERS;



--error ER_PARSE_ERROR

create table VARIANCE(a int);

create table VARIANCE (a int);

drop table VARIANCE;



--error ER_PARSE_ERROR

create table VAR_POP(a int);

create table VAR_POP (a int);

drop table VAR_POP;



--error ER_PARSE_ERROR

create table VAR_SAMP(a int);

create table VAR_SAMP (a int);

drop table VAR_SAMP;



set SQL_MODE='IGNORE_SPACE';



create table ADDDATE(a int);

drop table ADDDATE;

create table ADDDATE (a int);

drop table ADDDATE;



--error ER_PARSE_ERROR

create table BIT_AND(a int);

--error ER_PARSE_ERROR

create table BIT_AND (a int);



--error ER_PARSE_ERROR

create table BIT_OR(a int);

--error ER_PARSE_ERROR

create table BIT_OR (a int);



--error ER_PARSE_ERROR

create table BIT_XOR(a int);

--error ER_PARSE_ERROR

create table BIT_XOR (a int);



--error ER_PARSE_ERROR

create table CAST(a int);

--error ER_PARSE_ERROR

create table CAST (a int);



--error ER_PARSE_ERROR

create table COUNT(a int);

--error ER_PARSE_ERROR

create table COUNT (a int);



--error ER_PARSE_ERROR

create table CURDATE(a int);

--error ER_PARSE_ERROR

create table CURDATE (a int);



--error ER_PARSE_ERROR

create table CURTIME(a int);

--error ER_PARSE_ERROR

create table CURTIME (a int);



--error ER_PARSE_ERROR

create table DATE_ADD(a int);

--error ER_PARSE_ERROR

create table DATE_ADD (a int);



--error ER_PARSE_ERROR

create table DATE_SUB(a int);

--error ER_PARSE_ERROR

create table DATE_SUB (a int);



--error ER_PARSE_ERROR

create table EXTRACT(a int);

--error ER_PARSE_ERROR

create table EXTRACT (a int);



--error ER_PARSE_ERROR

create table GROUP_CONCAT(a int);

--error ER_PARSE_ERROR

create table GROUP_CONCAT (a int);



# Limitation removed in 5.1

create table GROUP_UNIQUE_USERS(a int);

drop table GROUP_UNIQUE_USERS;

create table GROUP_UNIQUE_USERS (a int);

drop table GROUP_UNIQUE_USERS;



--error ER_PARSE_ERROR

create table MAX(a int);

--error ER_PARSE_ERROR

create table MAX (a int);



--error ER_PARSE_ERROR

create table MID(a int);

--error ER_PARSE_ERROR

create table MID (a int);



--error ER_PARSE_ERROR

create table MIN(a int);

--error ER_PARSE_ERROR

create table MIN (a int);



--error ER_PARSE_ERROR

create table NOW(a int);

--error ER_PARSE_ERROR

create table NOW (a int);



--error ER_PARSE_ERROR

create table POSITION(a int);

--error ER_PARSE_ERROR

create table POSITION (a int);



create table SESSION_USER(a int);

drop table SESSION_USER;

create table SESSION_USER (a int);

drop table SESSION_USER;



--error ER_PARSE_ERROR

create table STD(a int);

--error ER_PARSE_ERROR

create table STD (a int);



--error ER_PARSE_ERROR

create table STDDEV(a int);

--error ER_PARSE_ERROR

create table STDDEV (a int);



--error ER_PARSE_ERROR

create table STDDEV_POP(a int);

--error ER_PARSE_ERROR

create table STDDEV_POP (a int);



--error ER_PARSE_ERROR

create table STDDEV_SAMP(a int);

--error ER_PARSE_ERROR

create table STDDEV_SAMP (a int);



create table SUBDATE(a int);

drop table SUBDATE;

create table SUBDATE (a int);

drop table SUBDATE;



--error ER_PARSE_ERROR

create table SUBSTR(a int);

--error ER_PARSE_ERROR

create table SUBSTR (a int);



--error ER_PARSE_ERROR

create table SUBSTRING(a int);

--error ER_PARSE_ERROR

create table SUBSTRING (a int);



--error ER_PARSE_ERROR

create table SUM(a int);

--error ER_PARSE_ERROR

create table SUM (a int);



--error ER_PARSE_ERROR

create table SYSDATE(a int);

--error ER_PARSE_ERROR

create table SYSDATE (a int);



create table SYSTEM_USER(a int);

drop table SYSTEM_USER;

create table SYSTEM_USER (a int);

drop table SYSTEM_USER;



--error ER_PARSE_ERROR

create table TRIM(a int);

--error ER_PARSE_ERROR

create table TRIM (a int);



# Limitation removed in 5.1

create table UNIQUE_USERS(a int);

drop table UNIQUE_USERS;

create table UNIQUE_USERS (a int);

drop table UNIQUE_USERS;



--error ER_PARSE_ERROR

create table VARIANCE(a int);

--error ER_PARSE_ERROR

create table VARIANCE (a int);



--error ER_PARSE_ERROR

create table VAR_POP(a int);

--error ER_PARSE_ERROR

create table VAR_POP (a int);



--error ER_PARSE_ERROR

create table VAR_SAMP(a int);

--error ER_PARSE_ERROR

create table VAR_SAMP (a int);



#

# Bug#25930 (CREATE TABLE x SELECT ... parses columns wrong when ran with

#            ANSI_QUOTES mode)

#



--disable_warnings

DROP TABLE IF EXISTS table_25930_a;

DROP TABLE IF EXISTS table_25930_b;

--enable_warnings



SET SQL_MODE = 'ANSI_QUOTES';

CREATE TABLE table_25930_a ( "blah" INT );

CREATE TABLE table_25930_b SELECT "blah" - 1 FROM table_25930_a;



# The lexer used to chop the first <">,

# not marking the start of the token "blah" correctly.

desc table_25930_b;



DROP TABLE table_25930_a;

DROP TABLE table_25930_b;





SET @@sql_mode=@save_sql_mode;



#

# Bug#26030 (Parsing fails for stored routine w/multi-statement execution

# enabled)
@@ -434,293 +53,7 @@ $$ 
delimiter ;$$

DROP PROCEDURE p26030;



#=============================================================================

#============================================================================r

# SYNTACTIC PARSER (bison)

#=============================================================================

#

#

# Bug#21114 (Foreign key creation fails to table with name format)

# 



# Test coverage with edge conditions



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select pi(3.14);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select tan();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select tan(1, 2);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select makedate(1);

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select makedate(1, 2, 3);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select maketime();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select maketime(1);

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select maketime(1, 2);

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select maketime(1, 2, 3, 4);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select atan();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select atan2(1, 2, 3);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select concat();

select concat("foo");



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select concat_ws();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select concat_ws("foo");



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select encrypt();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select encrypt(1, 2, 3);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select des_encrypt("p1", "p2", "not expected");

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select des_decrypt("p1", "p2", "not expected");



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select elt();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select elt(1);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select export_set();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select export_set("p1");

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select export_set("p1", "p2");

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select export_set("p1", "p2", "p3", "p4", "p5", "p6");



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select field();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select field("p1");



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select from_unixtime();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select from_unixtime(1, 2, 3);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select unix_timestamp(1, 2);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select greatest();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select greatest(12);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select last_insert_id(1, 2);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select least();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select least(12);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select locate();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select locate(1);

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select locate(1, 2, 3, 4);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select log();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select log(1, 2, 3);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select make_set();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select make_set(1);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select master_pos_wait();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select master_pos_wait(1);

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select master_pos_wait(1, 2, 3, 4);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select rand(1, 2, 3);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select round(1, 2, 3);



-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select yearweek();

-- error ER_WRONG_PARAMCOUNT_TO_NATIVE_FCT

select yearweek(1, 2, 3);



#

# Bug#24736: UDF functions parsed as Stored Functions

#



# Verify that the syntax for calling UDF : foo(expr AS param, ...)

# can not be used when calling native functions



# Native function with 1 argument



select abs(3);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select abs(3 AS three);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select abs(3 three);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select abs(3 AS "three");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select abs(3 "three");



# Native function with 2 arguments



set @bar="bar";

set @foobar="foobar";



select instr("foobar", "bar");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar" AS p1, "bar");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar" p1, "bar");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar" AS "p1", "bar");

## String concatenation, valid syntax

select instr("foobar" "p1", "bar");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr(@foobar "p1", "bar");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar", "bar" AS p2);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar", "bar" p2);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar", "bar" AS "p2");

## String concatenation, valid syntax

select instr("foobar", "bar" "p2");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar", @bar "p2");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select instr("foobar" AS p1, "bar" AS p2);



# Native function with 3 arguments



select conv(255, 10, 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255 AS p1, 10, 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255 p1, 10, 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255 AS "p1", 10, 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255 "p1", 10, 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10 AS p2, 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10 p2, 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10 AS "p2", 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10 "p2", 16);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10, 16 AS p3);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10, 16 p3);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10, 16 AS "p3");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255, 10, 16 "p3");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select conv(255 AS p1, 10 AS p2, 16 AS p3);



# Native function with a variable number of arguments



select atan(10);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 AS p1);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 p1);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 AS "p1");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 "p1");



select atan(10, 20);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 AS p1, 20);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 p1, 20);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 AS "p1", 20);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 "p1", 20);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10, 20 AS p2);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10, 20 p2);

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10, 20 AS "p2");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10, 20 "p2");

-- error ER_WRONG_PARAMETERS_TO_NATIVE_FCT

select atan(10 AS p1, 20 AS p2);



#

# Bug#22312 Syntax error in expression with INTERVAL()

#



--disable_warnings

DROP TABLE IF EXISTS t1;

--enable_warnings



SELECT STR_TO_DATE('10:00 PM', '%h:%i %p') + INTERVAL 10 MINUTE;

SELECT STR_TO_DATE('10:00 PM', '%h:%i %p') + INTERVAL (INTERVAL(1,2,3) + 1) MINUTE;

SELECT "1997-12-31 23:59:59" + INTERVAL 1 SECOND;

SELECT 1 + INTERVAL(1,0,1,2) + 1;

SELECT INTERVAL(1^1,0,1,2) + 1;

SELECT INTERVAL(1,0+1,2,3) * 5.5;

SELECT INTERVAL(3,3,1+3,4+4) / 0.5;

SELECT (INTERVAL(1,0,1,2) + 5) * 7 + INTERVAL(1,0,1,2) / 2;

SELECT INTERVAL(1,0,1,2) + 1, 5 * INTERVAL(1,0,1,2);

SELECT INTERVAL(0,(1*5)/2) + INTERVAL(5,4,3);



--disable_warnings

SELECT 1^1 + INTERVAL 1+1 SECOND & 1 + INTERVAL 1+1 SECOND;

SELECT 1%2 - INTERVAL 1^1 SECOND | 1%2 - INTERVAL 1^1 SECOND;

--enable_warnings



CREATE TABLE t1 (a INT, b DATETIME);

INSERT INTO t1 VALUES (INTERVAL(3,2,1) + 1, "1997-12-31 23:59:59" + INTERVAL 1 SECOND);

SELECT * FROM t1 WHERE a = INTERVAL(3,2,1) + 1;

DROP TABLE t1;



#

# Bug#28317 Left Outer Join with {oj outer-join}

#



--disable_warnings

DROP TABLE IF EXISTS t1,t2,t3;

--enable_warnings

CREATE TABLE t1 (a1 INT, a2 INT, a3 INT, a4 DATETIME);

CREATE TABLE t2 LIKE t1;

CREATE TABLE t3 LIKE t1;

SELECT t1.* FROM t1 AS t0, { OJ t2 INNER JOIN t1 ON (t1.a1=t2.a1) } WHERE t0.a3=2;

SELECT t1.*,t2.* FROM { OJ ((t1 INNER JOIN t2 ON (t1.a1=t2.a2)) LEFT OUTER JOIN t3 ON t3.a3=t2.a1)};

SELECT t1.*,t2.* FROM { OJ ((t1 LEFT OUTER JOIN t2 ON t1.a3=t2.a2) INNER JOIN t3 ON (t3.a1=t2.a2))};

SELECT t1.*,t2.* FROM { OJ (t1 LEFT OUTER JOIN t2 ON t1.a1=t2.a2) CROSS JOIN t3 ON (t3.a2=t2.a3)};

SELECT * FROM {oj t1 LEFT OUTER JOIN t2 ON t1.a1=t2.a3} WHERE t1.a2 > 10;

SELECT {fn CONCAT(a1,a2)} FROM t1;

UPDATE t3 SET a4={d '1789-07-14'} WHERE a1=0;

SELECT a1, a4 FROM t2 WHERE a4 LIKE {fn UCASE('1789-07-14')};

DROP TABLE t1, t2, t3;

mysql-test/t/parser.test.moved

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+726 −0

File added.

Preview size limit exceeded, changes collapsed.

sql/log_event.cc

+7 −1
Original line number Diff line number Diff line
@@ -4869,8 +4869,14 @@ int User_var_log_event::do_apply_event(Relay_log_info const *rli) 
  /*

    Item_func_set_user_var can't substitute something else on its place =>

    0 can be passed as last argument (reference on item)



    Fix_fields() can fail, in which case a call of update_hash() might

    crash the server, so if fix fields fails, we just return with an

    error.

  */

  e.fix_fields(thd, 0);

  if (e.fix_fields(thd, 0))

    return 1;



  /*

    A variable can just be considered as a table with

    a single record and with a single column. Thus, like