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src

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Modify UPDATE/DELETE WHERE CURRENT OF to use the FOR UPDATE infrastructure to
Tom Lane authored 
locate the target row, if the cursor was declared with FOR UPDATE or FOR
SHARE.  This approach is more flexible and reliable than digging through the
plan tree; for instance it can cope with join cursors.  But we still provide
the old code for use with non-FOR-UPDATE cursors.  Per gripe from Robert Haas.
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