1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
<?xml version="1.0" encoding="ISO-8859-1"?>
<!--
-
- This file is part of the OpenLink Software Virtuoso Open-Source (VOS)
- project.
-
- Copyright (C) 1998-2018 OpenLink Software
-
- This project is free software; you can redistribute it and/or modify it
- under the terms of the GNU General Public License as published by the
- Free Software Foundation; only version 2 of the License, dated June 1991.
-
- This program is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License along
- with this program; if not, write to the Free Software Foundation, Inc.,
- 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-
-->
<refentry id="fn_XQ_SEQUENCE_AGG">
<refmeta>
<refentrytitle>DB.DBA.XQ_SEQUENCE_AGG</refentrytitle>
<refmiscinfo>aggr</refmiscinfo>
</refmeta>
<refnamediv>
<refname>DB.DBA.XQ_SEQUENCE_AGG</refname>
<refpurpose>Creates an XQuery sequence object that consists of all values passed the the aggregate.</refpurpose>
</refnamediv>
<refsynopsisdiv>
<funcsynopsis id="fsyn_XQ_SEQUENCE_AGG">
<funcprototype id="fproto_XQ_SEQUENCE_AGG">
<funcdef>vector <function>DB.DBA.XQ_SEQUENCE_AGG</function></funcdef>
<paramdef><parameter>value_expression</parameter> any</paramdef>
</funcprototype>
</funcsynopsis>
</refsynopsisdiv>
<refsect1 id="desc_XQ_SEQUENCE_AGG"><title>Description</title>
<para><function>DB.DBA.XQ_SEQUENCE_AGG</function> creates an XQuery sequence object that consists of all values
passed the aggregate.
</para>
</refsect1>
<refsect1 id="params_XQ_SEQUENCE_AGG"><title>Parameters</title>
<refsect2><title>value_expression</title>
<para>Values are "flatten" before being added to the sequence. It means that --- NULLs are not added at all.</para>
<para>If an XQuery sequence object is passed to the aggregate then all items of sequence are appended to the
end of the accumulated result, one after other. Thus the aggregate of a sequence ('A', 'B'), a string 'C' and
a sequence ('D', 'E', 'F') is a sequence ('A', 'B', 'C', 'D', 'E', 'F'), not something like (('A', 'B'), 'C', ('D', 'E', 'F')).
</para>
<para>If an SQL vector is passed to the aggregate then every item of the vector is appended to result separately, and if an
item is in turn a nested vector or a nested XQuery sequence then every sub-item is appended separately, in a
recursive manner. So SQL vectors are "flattened" recursively.
</para>
<para>If the argument of DB.DBA.XQ_SEQUENCE_AGG () is a narrow string or a wide string it is converted to UTF-8
before being added to the sequence. If an SQL vector contains a narrow or wide string then it is also converted
to UTF-8. However if a narrow string is an item of an XQuery sequence then it is treated as UTF-8 and not
subject to encoding.
</para>
</refsect2>
</refsect1>
<refsect1 id="ret_XQ_SEQUENCE_AGG"><title>Return Types</title>
<para>Any
</para>
</refsect1>
<refsect1 id="seealso_XQ_SEQUENCE_AGG"><title>See Also</title>
<para><link linkend="fn_xquery_eval"><function>xquery_eval()</function></link></para>
<para><link linkend="fn_VECTOR_AGG"><function>DB.DBA.VECTOR_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_OF_NONNULLS_AGG"><function>DB.DBA.VECTOR_OF_NONNULLS_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_OR_NULL_AGG"><function>DB.DBA.VECTOR_OR_NULL_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_OF_NONNULLS_OR_NULL_AGG"><function>DB.DBA.VECTOR_OF_NONNULLS_OR_NULL_AGG()</function></link></para>
<para><link linkend="fn_VECTOR_CONCAT_AGG"><function>DB.DBA.VECTOR_CONCAT_AGG()</function></link></para>
<para><link linkend="fn_BAG_AGG"><function>DB.DBA.BAG_AGG()</function></link></para>
<para><link linkend="fn_BAG_OF_NONNULLS_AGG"><function>DB.DBA.BAG_OF_NONNULLS_AGG()</function></link></para>
<para><link linkend="fn_BAG_OR_NULL_AGG"><function>DB.DBA.BAG_OR_NULL_AGG()</function></link></para>
<para><link linkend="fn_BAG_OF_NONNULLS_OR_NULL_AGG"><function>DB.DBA.BAG_OF_NONNULLS_OR_NULL_AGG()</function></link></para>
<para><link linkend="fn_BAG_CONCAT_AGG"><function>DB.DBA.BAG_CONCAT_AGG()</function></link></para>
<para><link linkend="fn_GROUP_CONCAT"><function>DB.DBA.GROUP_CONCAT()</function></link></para>
<para><link linkend="fn_GROUP_CONCAT_DISTINCT"><function>DB.DBA.GROUP_CONCAT_DISTINCT()</function></link></para>
<para><link linkend="fn_GROUP_DIGEST"><function>DB.DBA.GROUP_DIGEST()</function></link></para>
<para><link linkend="fn_SAMPLE"><function>DB.DBA.SAMPLE()</function></link></para>
</refsect1>
</refentry>
|
