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Diffstat (limited to 'doc/src/sgml/func.sgml')
| -rw-r--r-- | doc/src/sgml/func.sgml | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index 2890f0e2c4d..5feb23c9371 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -10896,10 +10896,13 @@ table2-mapping <note> <para> - The <literal>||</> operator concatenates the elements at the top level of - each of its operands. It does not operate recursively. For example, if - both operands are objects with a common key field name, the value of the - field in the result will just be the value from the right hand operand. + The <literal>||</literal> operator concatenates two JSON objects by + generating an object containing the union of their keys, taking the + second object's value when there are duplicate keys. All other cases + produce a JSON array: first, any non-array input is converted into a + single-element array, and then the two arrays are concatenated. + It does not operate recursively; only the top-level array or object + structure is merged. </para> </note> |