From 53290bc3f70b9896a0c581fb0ed7eb235840890c Mon Sep 17 00:00:00 2001
From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Thu, 12 Dec 2019 20:34:03 -0600
Subject: [PATCH v12 2/5] add errcontext callback in lazy_vacuum_heap, too

---
 src/backend/access/heap/vacuumlazy.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c
index 0c4ec7b..9f30344 100644
--- a/src/backend/access/heap/vacuumlazy.c
+++ b/src/backend/access/heap/vacuumlazy.c
@@ -1792,11 +1792,21 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats)
 	int			npages;
 	PGRUsage	ru0;
 	Buffer		vmbuffer = InvalidBuffer;
+	ErrorContextCallback errcallback;
 
 	/* Report that we are now vacuuming the heap */
 	pgstat_progress_update_param(PROGRESS_VACUUM_PHASE,
 								 PROGRESS_VACUUM_PHASE_VACUUM_HEAP);
 
+	/* Setup error traceback support for ereport() */
+	/* vacrelstats->relnamespace already set */
+	/* vacrelstats->relname already set */
+	vacrelstats->blkno = InvalidBlockNumber; /* Not known yet */
+	errcallback.callback = vacuum_error_callback;
+	errcallback.arg = (void *) vacrelstats;
+	errcallback.previous = error_context_stack;
+	error_context_stack = &errcallback;
+
 	pg_rusage_init(&ru0);
 	npages = 0;
 
@@ -1811,6 +1821,7 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats)
 		vacuum_delay_point();
 
 		tblk = ItemPointerGetBlockNumber(&vacrelstats->dead_tuples->itemptrs[tupindex]);
+		vacrelstats->blkno = tblk;
 		buf = ReadBufferExtended(onerel, MAIN_FORKNUM, tblk, RBM_NORMAL,
 								 vac_strategy);
 		if (!ConditionalLockBufferForCleanup(buf))
@@ -1831,6 +1842,9 @@ lazy_vacuum_heap(Relation onerel, LVRelStats *vacrelstats)
 		npages++;
 	}
 
+	/* Pop the error context stack */
+	error_context_stack = errcallback.previous;
+
 	if (BufferIsValid(vmbuffer))
 	{
 		ReleaseBuffer(vmbuffer);
-- 
2.7.4

