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b4cc35fbb7
Coverity complained about this code's practice of using scalar variables as single-element arrays. While that's really just nitpicking, it probably is more readable to declare them as arrays, so let's do that. A more important point is that the code was just blithely assuming that the result tupledesc has exactly one column; if it doesn't, we'd likely get a crash of some sort in tuplestore_putvalues. Since the tupledesc is manufactured outside of plperl, that seems like an uncomfortably long chain of assumptions. We can nail it down at little cost with a sanity check earlier in the function.