| From: | "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com> |
|---|---|
| To: | PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | doc: array_length produces null instead of 0 |
| Date: | 2022-06-10 00:30:27 |
| Message-ID: | CAKFQuwaoBmRuWdMLzLHDCFDJDX3wvfQ7egAF0bpik_BFgG1KWg@mail.gmail.com |
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| Lists: | pgsql-hackers |
Hi,
Per discussion here:
We can now easily document the array_length behavior of returning null
instead of zero for an empty array/dimension.
I added an example to the json_array_length function to demonstrate that it
does return 0 as one would expect, but contrary to the SQL array behavior.
I did not bother to add examples to the other half dozen or so "_length"
functions that all produce 0 as expected. Just the surprising case and the
adjacent one.
David J.
| Attachment | Content-Type | Size |
|---|---|---|
| 0001-doc-array_length-produces-null-instead-of-0.patch | application/octet-stream | 1.4 KB |
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