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Doc: update sections 9.14 - 9.16 for new function table layout.

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Minor editorial changes in the first two sections; larger ones
in the JSON section.
This commit is contained in:
Tom Lane 2020-04-30 12:53:44 -04:00
parent eb892102e0
commit 30e82f1bc9
2 changed files with 2121 additions and 1537 deletions
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doc/src/sgml/func.sgml
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doc/src/sgml/json.sgml
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@ -648,8 +648,8 @@ SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @> '{"tags": ["qu
<para>
The semantics of SQL/JSON path predicates and operators generally follow SQL.
At the same time, to provide a most natural way of working with JSON data,
SQL/JSON path syntax uses some of the JavaScript conventions:
At the same time, to provide a natural way of working with JSON data,
SQL/JSON path syntax uses some JavaScript conventions:
</para>
<itemizedlist>
@ -701,7 +701,7 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
<para>
A path expression consists of a sequence of path elements,
which can be the following:
which can be any of the following:
<itemizedlist>
<listitem>
<para>
@ -722,7 +722,7 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
<listitem>
<para>
<type>jsonpath</type> operators and methods listed
in <xref linkend="functions-sqljson-path-operators"/>
in <xref linkend="functions-sqljson-path-operators"/>.
</para>
</listitem>
<listitem>
@ -751,7 +751,7 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
<tbody>
<row>
<entry><literal>$</literal></entry>
<entry>A variable representing the JSON text to be queried
<entry>A variable representing the JSON value being queried
(the <firstterm>context item</firstterm>).
</entry>
</row>
@ -759,9 +759,8 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
<entry><literal>$varname</literal></entry>
<entry>
A named variable. Its value can be set by the parameter
<parameter>vars</parameter> of several JSON processing functions.
See <xref linkend="functions-json-processing-table"/> and
its notes for details.
<parameter>vars</parameter> of several JSON processing functions;
see <xref linkend="functions-json-processing-table"/> for details.
<!-- TODO: describe PASSING clause once implemented !-->
</entry>
</row>
@ -797,10 +796,10 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
<entry>
<para>
Member accessor that returns an object member with
the specified key. If the key name is a named variable
the specified key. If the key name matches some named variable
starting with <literal>$</literal> or does not meet the
JavaScript rules of an identifier, it must be enclosed in
double quotes as a character string literal.
JavaScript rules for an identifier, it must be enclosed in
double quotes to make it a string literal.
</para>
</entry>
</row>
@ -845,9 +844,9 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
</entry>
<entry>
<para>
Same as <literal>.**</literal>, but with a filter over nesting
levels of JSON hierarchy. Nesting levels are specified as integers.
Zero level corresponds to the current object. To access the lowest
Like <literal>.**</literal>, but selects only the specified
levels of the JSON hierarchy. Nesting levels are specified as integers.
Level zero corresponds to the current object. To access the lowest
nesting level, you can use the <literal>last</literal> keyword.
This is a <productname>PostgreSQL</productname> extension of
the SQL/JSON standard.
@ -874,7 +873,7 @@ SELECT jdoc-&gt;'guid', jdoc-&gt;'name' FROM api WHERE jdoc @&gt; '{"tags": ["qu
<para>
The specified <replaceable>index</replaceable> can be an integer, as
well as an expression returning a single numeric value, which is
automatically cast to integer. Zero index corresponds to the first
automatically cast to integer. Index zero corresponds to the first
array element. You can also use the <literal>last</literal> keyword
to denote the last array element, which is useful for handling arrays
of unknown length.