2 files changed, 35 insertions, 0 deletions
diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h
index 0db5d18ba22..69396a9d7f8 100644
--- a/src/include/executor/executor.h
+++ b/src/include/executor/executor.h
@@ -158,6 +158,40 @@ extern TupleHashEntry FindTupleHashEntry(TupleHashTable hashtable,
 										 ExprState *hashexpr);
 extern void ResetTupleHashTable(TupleHashTable hashtable);
 
+#ifndef FRONTEND
+/*
+ * Return size of the hash bucket. Useful for estimating memory usage.
+ */
+static inline size_t
+TupleHashEntrySize(void)
+{
+	return sizeof(TupleHashEntryData);
+}
+
+/*
+ * Return tuple from hash entry.
+ */
+static inline MinimalTuple
+TupleHashEntryGetTuple(TupleHashEntry entry)
+{
+	return entry->firstTuple;
+}
+
+/*
+ * Get a pointer into the additional space allocated for this entry. The
+ * memory will be maxaligned and zeroed.
+ *
+ * The amount of space available is the additionalsize requested in the call
+ * to BuildTupleHashTable(). If additionalsize was specified as zero, return
+ * NULL.
+ */
+static inline void *
+TupleHashEntryGetAdditional(TupleHashTable hashtable, TupleHashEntry entry)
+{
+	return entry->additional;
+}
+#endif
+
 /*
  * prototypes from functions in execJunk.c
  */
diff --git a/src/include/nodes/execnodes.h b/src/include/nodes/execnodes.h
index b5539ddb41e..7df25d7e64f 100644
--- a/src/include/nodes/execnodes.h
+++ b/src/include/nodes/execnodes.h
@@ -863,6 +863,7 @@ typedef struct TupleHashTableData
 	Oid		   *tab_collations; /* collations for hash and comparison */
 	MemoryContext tablecxt;		/* memory context containing table */
 	MemoryContext tempcxt;		/* context for function evaluations */
+	Size		additionalsize; /* size of additional data */
 	TupleTableSlot *tableslot;	/* slot for referencing table entries */
 	/* The following fields are set transiently for each table search: */
 	TupleTableSlot *inputslot;	/* current input tuple's slot */