Hi, Per discussion here:
https://www.postgresql.org/message-id/163636931138.8076.5140809232053731248%40wrigleys.postgresql.org 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.
0001-doc-array_length-produces-null-instead-of-0.patch
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