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This commit updates the pgbench documentation to list \gset and \aset as separate terms for easier reading. It also clarifies that \gset raises an error if the query returns zero or multiple rows, and explains how to detect cases where the query with \aset returned no rows. Author: Yugo Nagata <nagata@sraoss.co.jp> Reviewed-by: Fujii Masao <masao.fujii@gmail.com> Discussion: https://postgr.es/m/20250626180125.5b896902a3d0bcd93f86c240@sraoss.co.jp