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tsqueryrecv() calls findoprnd() even when the input has no query items, so it fails on an empty tsquery, which is legal data. This breaks, for example, binary COPY of a table containing an empty tsquery. Skip the operand walk for an empty query, as parse_tsquery() does. Bug: #19778 Reported-by: Shay Rojansky <roji@roji.org> Author: Ayush Tiwari <ayushtiwari.slg01@gmail.com> Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/19778-1befc1fba593ab1b@postgresql.org Backpatch-through: 14