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Document jsonpath .** accessor with nesting level filter

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It appears that some variants of .** jsonpath accessor are undocumented.  In
particular undocumented variants are:

 .**{level}
 .**{lower_level to upper_level}
 .**{lower_level to last}

This commit adds missing documentation for them.
This commit is contained in:
Alexander Korotkov 2019-05-17 05:16:31 +03:00
parent da71f98efb
commit e0e3dad770
1 changed files with 24 additions and 0 deletions
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doc/src/sgml/json.sgml
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@ -807,6 +807,30 @@ SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @> '{"tags": ["qu
</para>
</entry>
</row>
<row>
<entry>
<para>
<literal>.**{<replaceable>level</replaceable>}</literal>
</para>
<para>
<literal>.**{<replaceable>lower_level</replaceable> to
<replaceable>upper_level</replaceable>}</literal>
</para>
<para>
<literal>.**{<replaceable>lower_level</replaceable> to
last}</literal>
</para>
</entry>
<entry>
<para>
Same as <literal>.**</literal>, but with filter over nesting
level of JSON hierarchy. Levels are specified as integers.
Zero level corresponds to current object. This is a
<productname>PostgreSQL</productname> extension of the SQL/JSON
standard.
</para>
</entry>
</row>
<row>
<entry>
<para>