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Notes from the TAP/ADQL splinter session on [[http://wiki.ivoa.net/twiki/bin/view/IVOA/InterOpMay2014][Wednesday 21 May 2014]] at the [[http://www.sciops.esa.int/index.php?project=CONF2014&page=IVOA2014][IVOA Interop meeting]] at ESAC.

During the meeting the group reviewed a number of proposed changes to TAP and ADQL described in the [[https://volute.googlecode.com/svn/trunk/projects/dal/TAPNotes/TAPNotes-fmt.html][TAP Implementation Notes Version 1.0]].

The following section lists the recommendations agreed at the meeting for each of the changes that were reviewed.

After each section there is a table for adding feedback. Please add your vote to indicate

   * +1 You agree with the decision
   * 0 You don't mind either way
   * -1 You disagree with the decision
If you vote to disagree please provide a brief one line explanation describing why (or a link to a new page if you prefer).

For items that need more discussion please raise them on the working group [[http://www.ivoa.net/pipermail/dal/][mailing list]].

Thank you for your feedback. -- IVOA.DaveMorris - 2014-07-18

---+++ Example item
Some text describing the item, with a reference to the [[https://volute.googlecode.com/svn/trunk/projects/dal/TAPNotes/TAPNotes-fmt.html#adql][original item]] in the TAP Implementation Notes.

---+++++ May 2014 Interop
_A brief summary of the discussion at the May Interop._

---+++++ Community feedback
| Name | date | vote | notes |
| IVOA.MarcoMolinaro | 2014-07-18 | +1 | |
| IVOA.DaveMorris | 2014-07-18 | +1 | Yes, good idea |
| IVOA.DaveMorris | 2014-07-18 | 0 | Ok, as long as it is optional |
| IVOA.DaveMorris | 2014-07-18 | -1 | It isn't the right colour, our users prefer blue background. |

---
---+++ Separator Nonterminal
This [[https://volute.googlecode.com/svn/trunk/projects/dal/TAPNotes/TAPNotes-fmt.html#ac-sep][item]] proposes two options to clarify the use of whitespace and comments in ADQL.

One option for such a clarification is to amend section 2.1 of [std:ADQL] with a subsection 2.1.4, "Tokens and literals", containing text like the following (taken essentially from [std:SQL1992]).

   1. Any token may be followed by a separator. A nondelimiter token shall be followed by a delimiter token or a separator.

Since the full rules for the separator are somewhat more complex in [std:ADQL], an attractive alternative could be to omit the separator nonterminal from the grammar and to just note:

   2. Whitespace and comments can occur wherever they can occur in [std:SQL1992].

---+++++ May 2014 Interop
It was agreed that this item should be included in the errata note for the current, [std:ADQL-20081030], version of the standard.

---+++++ Community feedback
| Name | date | vote | notes | 
| IVOA.DaveMorris | 2014-07-18 | 0 | Accept either option |

---
---+++ Type System
This [[https://volute.googlecode.com/svn/trunk/projects/dal/TAPNotes/TAPNotes-fmt.html#ac-typesystem][item]] proposes adding new section to introduce a notion of types into section 2 of the ADQL recommendation.

See the [[https://volute.googlecode.com/svn/trunk/projects/dal/TAPNotes/TAPNotes-fmt.html#ac-typesystem][original text]] for details of the proposed type mappings. 

---+++++ May 2014 Interop
It was agreed that this item should be discussed further, with a view to including it in the next (minor) version of the [std:ADQL] standard.

---+++++ Community feedback
| Name | date | vote | notes | 
| IVOA.DaveMorris | 2014-07-18 | -1 | In general yes, but some parts need further discussion (see below). |

Transporting BLOB, CLOB, TIMESTAMP, POINT and REGION as char(<literal>*</literal>) strings should *not* imply the ADQL string concatenation operator are applicable.
-- IVOA.DaveMorris - 2014-09-04

Topic revision: r4 - 2014-09-04 - DaveMorris

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