[Tarantool-patches] [PATCH v2 13/15] WIP: module api: expose box_key_def_merge()

[Alexander Turenko <alexander.turenko@tarantool.org>]

Part of #5273
---
 src/box/key_def.c |  6 ++++++
 src/box/key_def.h | 14 ++++++++++++++
 src/exports.h     |  1 +
 3 files changed, 21 insertions(+)

diff --git a/src/box/key_def.c b/src/box/key_def.c
index e7ecb6ec5..25a8decf0 100644
--- a/src/box/key_def.c
+++ b/src/box/key_def.c
@@ -614,6 +614,12 @@ box_tuple_compare_with_key(box_tuple_t *tuple_a, const char *key_b,
 
 }
 
+box_key_def_t *
+box_key_def_merge(const box_key_def_t *first, const box_key_def_t *second)
+{
+	return key_def_merge(first, second);
+}
+
 /* }}} Module API functions */
 
 int
diff --git a/src/box/key_def.h b/src/box/key_def.h
index f33c20430..224b56eb9 100644
--- a/src/box/key_def.h
+++ b/src/box/key_def.h
@@ -498,6 +498,20 @@ API_EXPORT int
 box_tuple_compare_with_key(box_tuple_t *tuple_a, const char *key_b,
 			   box_key_def_t *key_def);
 
+/**
+ * Allocate a new key_def with a set union of key parts from
+ * first and second key defs.
+ *
+ * Parts of the new key_def consist of the first key_def's parts
+ * and those parts of the second key_def that were not among the
+ * first parts.
+ *
+ * @retval not NULL  Ok.
+ * @retval NULL      Memory error.
+ */
+API_EXPORT box_key_def_t *
+box_key_def_merge(const box_key_def_t *first, const box_key_def_t *second);
+
 /** \endcond public */
 
 /*
diff --git a/src/exports.h b/src/exports.h
index 71ec1a9b5..223390d52 100644
--- a/src/exports.h
+++ b/src/exports.h
@@ -31,6 +31,7 @@ EXPORT(box_iterator_free)
 EXPORT(box_iterator_next)
 EXPORT(box_key_def_delete)
 EXPORT(box_key_def_dump_parts)
+EXPORT(box_key_def_merge)
 EXPORT(box_key_def_new)
 EXPORT(box_key_def_new_v2)
 EXPORT(box_key_def_validate_tuple)
-- 
2.25.0