From 8a70d8ae7501141d283e56b31e10c66697c986d5 Mon Sep 17 00:00:00 2001 From: Tom Lane Date: Sat, 14 Jan 2017 13:27:47 -0500 Subject: [PATCH] Throw suitable error for COPY TO STDOUT/FROM STDIN in a SQL function. A client copy can't work inside a function because the FE/BE wire protocol doesn't support nesting of a COPY operation within query results. (Maybe it could, but the protocol spec doesn't suggest that clients should support this, and libpq for one certainly doesn't.) In most PLs, this prohibition is enforced by spi.c, but SQL functions don't use SPI. A comparison of _SPI_execute_plan() and init_execution_state() shows that rejecting client COPY is the only discrepancy in what they allow, so there's no other similar bugs. This is an astonishingly ancient oversight, so back-patch to all supported branches. Report: https://postgr.es/m/BY2PR05MB2309EABA3DEFA0143F50F0D593780@BY2PR05MB2309.namprd05.prod.outlook.com --- src/backend/executor/functions.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/src/backend/executor/functions.c b/src/backend/executor/functions.c index 470db5bb4a..40a26cb956 100644 --- a/src/backend/executor/functions.c +++ b/src/backend/executor/functions.c @@ -500,7 +500,16 @@ init_execution_state(List *queryTree_list, fcache->readonly_func ? CURSOR_OPT_PARALLEL_OK : 0, NULL); - /* Precheck all commands for validity in a function */ + /* + * Precheck all commands for validity in a function. This should + * generally match the restrictions spi.c applies. + */ + if (IsA(stmt, CopyStmt) && + ((CopyStmt *) stmt)->filename == NULL) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + errmsg("cannot COPY to/from client in a SQL function"))); + if (IsA(stmt, TransactionStmt)) ereport(ERROR, (errcode(ERRCODE_FEATURE_NOT_SUPPORTED),