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postgres_fdw: Fix bug in checking of return value of PQsendQuery().

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When postgres_fdw begins an asynchronous data fetch, it submits FETCH query
by using PQsendQuery(). If PQsendQuery() fails and returns 0, postgres_fdw
should report an error. But, previously, postgres_fdw reported an error
only when the return value is less than 0, though PQsendQuery() never return
the values other than 0 and 1. Therefore postgres_fdw could not handle
the failure to send FETCH query in an asynchronous data fetch.

This commit fixes postgres_fdw so that it reports an error
when PQsendQuery() returns 0.

Back-patch to v14 where asynchronous execution was supported in postgres_fdw.

Author: Fujii Masao
Reviewed-by: Japin Li, Tom Lane
Discussion: https://postgr.es/m/b187a7cf-d4e3-5a32-4d01-8383677797f3@oss.nttdata.com
This commit is contained in:
Fujii Masao 2022-07-21 22:52:50 +09:00
parent d5623c447c
commit 63a8c689b0
1 changed files with 1 additions and 1 deletions
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contrib/postgres_fdw/postgres_fdw.c
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@ -7078,7 +7078,7 @@ fetch_more_data_begin(AsyncRequest *areq)
snprintf(sql, sizeof(sql), "FETCH %d FROM c%u",
fsstate->fetch_size, fsstate->cursor_number);
if (PQsendQuery(fsstate->conn, sql) < 0)
if (!PQsendQuery(fsstate->conn, sql))
pgfdw_report_error(ERROR, NULL, fsstate->conn, false, fsstate->query);
/* Remember that the request is in process */