release memory used while flushing logical mappings

Patch by Ants Aasma

diff --git a/src/backend/access/heap/rewriteheap.c b/src/backend/access/heap/rewriteheap.c
index 4cf07eaa2e4cfae2e2928a75599fd3e90d40caca..ae439e8d6f1454b6ef4abe3c8fa4aca4ccfb2610 100644 (file)
--- a/src/backend/access/heap/rewriteheap.c
+++ b/src/backend/access/heap/rewriteheap.c
@@ -897,7 +897,7 @@ logical_heap_rewrite_flush_mappings(RewriteState state)
 
        /* write all mappings consecutively */
        len = src->num_mappings * sizeof(LogicalRewriteMappingData);
-       waldata = palloc(len);
+       waldata = MemoryContextAlloc(state->rs_cxt, len);
        waldata_start = waldata;
 
        /*
@@ -943,6 +943,7 @@ logical_heap_rewrite_flush_mappings(RewriteState state)
        /* write xlog record */
        XLogInsert(RM_HEAP2_ID, XLOG_HEAP2_REWRITE, rdata);
 
+       pfree(waldata);
    }
    Assert(state->rs_num_rewrite_mappings == 0);
 }