[Tarantool-patches] [PATCH 12/14] WIP: module api: expose box_key_def_merge()

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

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

diff --git a/src/box/key_def_api.c b/src/box/key_def_api.c
index b8a0d5807..740fb4339 100644
--- a/src/box/key_def_api.c
+++ b/src/box/key_def_api.c
@@ -292,4 +292,10 @@ 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);
+}
+
 /* }}} API functions implementations */
diff --git a/src/box/key_def_api.h b/src/box/key_def_api.h
index 16934eeb4..0cef7d1ea 100644
--- a/src/box/key_def_api.h
+++ b/src/box/key_def_api.h
@@ -229,6 +229,20 @@ 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 45a62421e..be8144036 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_ex)
 EXPORT(box_key_part_def_create)
-- 
2.25.0