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Diffstat (limited to 'src/backend/storage/buffer/localbuf.c')
| -rw-r--r-- | src/backend/storage/buffer/localbuf.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/src/backend/storage/buffer/localbuf.c b/src/backend/storage/buffer/localbuf.c index 201ce2668fd..53981794b98 100644 --- a/src/backend/storage/buffer/localbuf.c +++ b/src/backend/storage/buffer/localbuf.c @@ -15,6 +15,7 @@ */ #include "postgres.h" +#include "access/parallel.h" #include "catalog/catalog.h" #include "executor/instrument.h" #include "storage/buf_internals.h" @@ -412,6 +413,19 @@ InitLocalBuffers(void) HASHCTL info; int i; + /* + * Parallel workers can't access data in temporary tables, because they + * have no visibility into the local buffers of their leader. This is a + * convenient, low-cost place to provide a backstop check for that. Note + * that we don't wish to prevent a parallel worker from accessing catalog + * metadata about a temp table, so checks at higher levels would be + * inappropriate. + */ + if (IsParallelWorker()) + ereport(ERROR, + (errcode(ERRCODE_INVALID_TRANSACTION_STATE), + errmsg("cannot access temporary tables during a parallel operation"))); + /* Allocate and zero buffer headers and auxiliary arrays */ LocalBufferDescriptors = (BufferDesc *) calloc(nbufs, sizeof(BufferDesc)); LocalBufferBlockPointers = (Block *) calloc(nbufs, sizeof(Block)); |