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(parent: 8873c5b) | patch
Doc: clarify handling of duplicate elements in array containment tests.
authorTom Lane <tgl@sss.pgh.pa.us>
Mon, 23 Sep 2019 16:37:04 +0000 (12:37 -0400)
committerTom Lane <tgl@sss.pgh.pa.us>
Mon, 23 Sep 2019 16:37:04 +0000 (12:37 -0400)
commit7cd99d39472e913c0849cfb5f75cd0173ab98735
tree506f8a730856bad3b0ae8b934d2517c4a7e959cctree | snapshot
parent8873c5b2017f87f8f7626782e67f5cd177cc4dffcommit | diff
Doc: clarify handling of duplicate elements in array containment tests.

The array <@ and @> operators do not worry about duplicates: if every
member of array X matches some element of array Y, then X is contained
in Y, even if several members of X get matched to the same Y member.
This was not explicitly stated in the docs though, so improve matters.

Discussion: https://postgr.es/m/156614120484.1310.310161642239149585@wrigleys.postgresql.org
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