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| -rw-r--r-- | doc/src/sgml/json.sgml | 21 |
1 files changed, 13 insertions, 8 deletions
diff --git a/doc/src/sgml/json.sgml b/doc/src/sgml/json.sgml index fae13743984..b8246badda9 100644 --- a/doc/src/sgml/json.sgml +++ b/doc/src/sgml/json.sgml @@ -836,17 +836,22 @@ SELECT jdoc->'guid', jdoc->'name' FROM api WHERE jdoc @> '{"tags": ["qu <para> <literal>[<replaceable>subscript</replaceable>, ...]</literal> </para> - <para> - <literal>[<replaceable>subscript</replaceable> to last]</literal> - </para> </entry> <entry> <para> - Array element accessor. The provided numeric subscripts return the - corresponding array elements. The first element in an array is - accessed with [0]. The <literal>last</literal> keyword denotes - the last subscript in an array and can be used to handle arrays - of unknown length. + Array element accessor. <literal><replaceable>subscript</replaceable></literal> + might be given in two forms: <literal><replaceable>expr</replaceable></literal> + or <literal><replaceable>lower_expr</replaceable> to <replaceable>upper_expr</replaceable></literal>. + The first form specifies single array element by its index. The second + form specified array slice by the range of indexes. Zero index + corresponds to the first array element. + </para> + <para> + Expression inside subscript may consititue an integer, + numeric expression or any other <literal>jsonpath</literal> expression + returning single numeric value. The <literal>last</literal> keyword + can be used in the expression denoting the last subscript in an array. + That's helpful for handling arrays of unknown length. </para> </entry> </row> |