UPDATES and FIXES in VSTAR 2.1RC1.33

[danakil]

2.1 RC1.33
==========
bug fixes:
REFERENCES with multiple source/destination columns now works
correctly, e.g.:
'T1.[C1,C2]' REFERENCES 'T2.[C1,C2]'

JOIN with multiple columns (e.g. 'T1' JOIN 'T2' USING
'[C1,C2]')
Toggle type display in VUI
NEW_COLUMN in a non-empty table
OPEN 'Sys.Column'
added:
HAVING
DECODE
LEFT_JOIN
LIMIT X === PAGESIZE X PAGE 0
Alias support in CREATE_TABLE and DESCRIBE_TABLE
Default support in CREATE_TABLE
changed:
JOIN_DISTINCT renamed to SEMI_JOIN
improved error handling for initialization, GET_OPTION,
SET_OPTION, WHERE

[danakil]

>        OPEN 'Sys.Column'

This was the problem reported by Dan Guerrero last Friday. it is now
fixed.

Sys.Database, Sys.Table, Sys.Column, and Sys.Procedure, will all be
fully implemented in the final release.

[danakil]

ADDED:
> LEFT_JOIN
We have now implemented LEFT_JOIN in addition to JOIN (which is a
standard INNER_JOIN).

> LIMIT N === PAGESIZE N PAGE 0
We now have LIMIT N which is equivalent to its MySQL counterpart (it
provides the first N result rows).
It is implemented as PAGESIZE N PAGE 0 combination (Note how the
PAGESIZE N PAGE M is a more powerful scheme)

CHANGED:
> JOIN_DISTINCT renamed to SEMI_JOIN
As Wolfgang Sakuler correctly pointed out the last time we had our
VectorStar meeting in Vienna, JOIN_DISTINCT is really a SEMI_JOIN. IBM
DB2 refers to it as "SEMI_JOIN" too.
We have thus renamed it so. Thanks Wolfgang, your comments are always
very well thought-of and quite insightful.