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171633ff5d
Since commit 044c99bc5, eqjoinsel passes the passed-in collation
to any operators it invokes. However, neqjoinsel failed to pass
on whatever collation it got, so that if we invoked a
collation-dependent operator via that code path, we'd get "could not
determine which collation to use for string comparison" or the like.
Per report from Justin Pryzby. Back-patch to v12, like the previous
commit.
Discussion: https://postgr.es/m/20200721191606.GL5748@telsasoft.com