pgbench: Fix error reporting in readCommandResponse().

pgbench uses readCommandResponse() to process server responses.
When readCommandResponse() encounters an error during a call to
PQgetResult() to fetch the current result, it attempts to report it
with an additional error message from PQerrorMessage(). However,
previously, this extra error message could be lost or become incorrect.

The cause was that after fetching the current result (and detecting
an error), readCommandResponse() called PQgetResult() again to
peek at the next result. This second call could overwrite the libpq
connection's error message before the original error was reported,
causing the error message retrieved from PQerrorMessage() to be
lost or overwritten.

This commit fixes the issue by updating readCommandResponse()
to use PQresultErrorMessage() instead of PQerrorMessage()
to retrieve the error message generated when the PQgetResult()
for the current result causes an error, ensuring the correct message
is reported.

Backpatch to all supported versions.

Author: Yugo Nagata <nagata@sraoss.co.jp>
Reviewed-by: Chao Li <lic@highgo.com>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/20250925110940.ebacc31725758ec47d5432c6@sraoss.co.jp
Backpatch-through: 13

diff --git a/src/bin/pgbench/pgbench.c b/src/bin/pgbench/pgbench.c
index bef07be392580c2e71fad9a5f092cd3af2648bfe..445d4ae72c2698972a7e997c533f072428ec24ab 100644 (file)
--- a/src/bin/pgbench/pgbench.c
+++ b/src/bin/pgbench/pgbench.c
@@ -3083,14 +3083,14 @@ readCommandResponse(CState *st, MetaCommand meta, char *varprefix)
                                pg_log_debug("client %d pipeline ending", st->id);
                                if (PQexitPipelineMode(st->con) != 1)
                                        pg_log_error("client %d failed to exit pipeline mode: %s", st->id,
-                                                                PQerrorMessage(st->con));
+                                                                PQresultErrorMessage(res));
                                break;
 
                        default:
                                /* anything else is unexpected */
                                pg_log_error("client %d script %d aborted in command %d query %d: %s",
                                                         st->id, st->use_file, st->command, qrynum,
-                                                        PQerrorMessage(st->con));
+                                                        PQresultErrorMessage(res));
                                goto error;
                }