GitHub user ardlema opened a pull request:
https://github.com/apache/metamodel/pull/82
METAMODEL-224 CONCAT function support first approach (non-functional)
These are the first steps to add support for the CONCAT scalar function.
I've got a bit bogged down with this, not sure whether I'm going down the
right path. It's been quite complicated because is the first time we're having
a function that might have one or more parameters and even the parameters might
apply to one, two... columns or they might be just literals. We might have the
following CONCAT functions:
CONCAT(column1, "hello", column2)
CONCAT("hello", "world")
CONCAT(column1, column2)
I've created a new select method with function and functionParameters where
the functionParameters are going to be the column names (or literals). But I've
found out that when I evaluate the function within my new ConcatFunction class
the selectItems from the row do not contain all the columns so I can't get the
values to create the result.
I need some help to keep working on this :(
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/ardlema/metamodel METAMODEL-224
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/metamodel/pull/82.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #82
----
commit 25e9713edf0329d152b10114f4ef3d422714c904
Author: Alberto Rodriguez <[email protected]>
Date: 2015-12-16T16:39:12Z
First approach to add concat function
commit 204e047c5e43881e533c96df851b73d201b329bb
Author: Alberto Rodriguez <[email protected]>
Date: 2015-12-16T17:26:32Z
Get the column values from SelectItem
commit 6852a15b69f7a7362d5b40f1145f6ebf1a8d8b0b
Author: Alberto Rodriguez <[email protected]>
Date: 2015-12-17T11:03:08Z
New test for CONCAT scalar function
commit d79969ef38a59eac1bf3921b4223c8dc355dc61e
Author: Alberto Rodriguez <[email protected]>
Date: 2015-12-17T11:03:13Z
Add conditions to make the new CONCAT scalar function work
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