A field with one value
On this page11
The Recyclable specification appears on 117 of the 238 containers
Which is just under half the shelf. And across all 238 rows it takes exactly one value, which is Yes.
A field that only ever says Yes cannot separate anything
There is no row it excludes and no row it distinguishes. As a filter it either keeps the rows that carry it or keeps everything, depending on how a blank is treated.
And the 117 rows carrying it are exactly the 117 PET rows
The two sets are identical, which was checked rather than assumed. No polypropylene row carries the field and no glass row carries it.
So its presence is a restatement of the material field
Recyclable equals Yes is PET equals PET under another name, in the same way the temperature range field is on this shelf. Two of the ten labels are reporting the same underlying fact.
The more serious problem is how its absence reads
A buyer filtering for Recyclable equals Yes gets 117 rows and loses 121. The 71 polypropylene rows and 50 glass rows look like they failed a test, and there is no test and no failure.
Nothing on these pages says any material is or is not recyclable
That depends on local collection and it is not in this record. The observation is about what the field can distinguish, not about any material.
Catalog wide the field behaves the same way at larger scale
It appears on 803 of 2,150 products and still takes one value. So the pattern is not an artifact of this shelf being a subset.
Which puts it in a different category from a sparse field
Width on 14 rows is incomplete and honest: where it is present it says something. Recyclable is complete in form and empty in content, and that is a worse state to be in.
And it is the inverse of a finding on another shelf
One shelf in this catalog records a shipping weight on nearly every row where the figure is sometimes per unit and sometimes per case. That field is populated and ambiguous. This one is populated and vacuous.
Both fail the same test, which is whether every row answers one question
A usable column answers the same question on every row and gives at least two different answers across them. Three fields on this shelf pass that test comfortably and three fail it in three different ways.