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-rw-r--r--src/include/utils/selfuncs.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/include/utils/selfuncs.h b/src/include/utils/selfuncs.h
index 2fa4c4fc1b0..f2563ad1cb3 100644
--- a/src/include/utils/selfuncs.h
+++ b/src/include/utils/selfuncs.h
@@ -117,6 +117,9 @@ typedef struct VariableStatData
* Callers should initialize all fields of GenericCosts to zero. In addition,
* they can set numIndexTuples to some positive value if they have a better
* than default way of estimating the number of leaf index tuples visited.
+ * Similarly, they can set num_sa_scans to some value >= 1 for an index AM
+ * that doesn't necessarily perform exactly one primitive index scan per
+ * distinct combination of ScalarArrayOp array elements.
*/
typedef struct
{