Log Message:
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Add some missing HeapTupleIsValid() controls for cache lookups.
Modified Files:
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plscheme:
plscheme.c (r1.13 -> r1.14)
(http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/plscheme/plscheme/plscheme.c.diff?r1=1.13&r2=1.14)