update: add tests related to multiple update to the same field

These are misc tests that can be related to the issue. Not sure all of
them do not work before the patch set for the issue. It is nice to have
them and be sure everything works fine.

Closes #8658

NO_DOC=minor

changelogs/unreleased/gh-8226-multiple-same-field-update.md

@@ -0,0 +1,3 @@
+## feature/box
+
+* Allowed multiple updates to the same tuple field in a single call (gh-8226).

test/box/update.result

@@ -2607,3 +2607,49 @@ t:update({{'+', '[2].a', 1}, {'!', '[2].b', {x = 2, y = 3}}, {'=', '[2].b.y', 4}
 ---
 - [7, {'b': {'y': 4, 'x': 2}, 'a': 2}, 11]
 ...
+-- Test removing field and then inserting it
+t = box.tuple.new({7, 5, 11})
+---
+...
+t:update({{'#', 2, 1}, {'!', 2, 6}})
+---
+- [7, 6, 11]
+...
+t = box.tuple.new{7, {a = 2, b = 5}, 11}
+---
+...
+t:update({{'+', '[2].a', 2}, {'#', '[2].b', 1}, {'!', '[2].b', 6}})
+---
+- [7, {'b': 6, 'a': 4}, 11]
+...
+t:update({{'#', '[2].b', 1}, {'!', '[2].b', 6}})
+---
+- [7, {'b': 6, 'a': 2}, 11]
+...
+-- Test inserting field and then removing it
+t = box.tuple.new({7, 11})
+---
+...
+t:update({{'!', 2, 5}, {'#', 2, 1}})
+---
+- [7, 11]
+...
+t = box.tuple.new({7, {a = 2}, 11})
+---
+...
+t:update({{'+', '[2].a', 2}, {'!', '[2].b', 7}, {'#', '[2].b', 1}})
+---
+- [7, {'a': 4}, 11]
+...
+t:update({{'!', '[2].b', 7}, {'#', '[2].b', 1}})
+---
+- [7, {'a': 2}, 11]
+...
+-- Test bar insert of non scalar value and then changing inside it
+t = box.tuple.new({7, {a = {a = 2}}, 11})
+---
+...
+t:update({{'!', '[2].a.b', {x = {x = {y = 2}}}}, {'+', '[2].a.b.x.x.y', 2}})
+---
+- [7, {'a': {'b': {'x': {'x': {'y': 4}}}, 'a': 2}}, 11]
+...

test/box/update.test.lua

@@ -956,3 +956,18 @@ t:update({{'+', '[2].a', 1}, {'!', '[2].b', {x = 2}}, {'+', '[2].b.x', 2}})
 t:update({{'+', '[2].a', 1}, {'!', '[2].b', {x = 2}}, {'!', '[2].b.y', 3}})
 t:update({{'+', '[2].a', 1}, {'!', '[2].b', {x = 2, y = 3}}, {'#', '[2].b.y', 1}})
 t:update({{'+', '[2].a', 1}, {'!', '[2].b', {x = 2, y = 3}}, {'=', '[2].b.y', 4}})
+-- Test removing field and then inserting it
+t = box.tuple.new({7, 5, 11})
+t:update({{'#', 2, 1}, {'!', 2, 6}})
+t = box.tuple.new{7, {a = 2, b = 5}, 11}
+t:update({{'+', '[2].a', 2}, {'#', '[2].b', 1}, {'!', '[2].b', 6}})
+t:update({{'#', '[2].b', 1}, {'!', '[2].b', 6}})
+-- Test inserting field and then removing it
+t = box.tuple.new({7, 11})
+t:update({{'!', 2, 5}, {'#', 2, 1}})
+t = box.tuple.new({7, {a = 2}, 11})
+t:update({{'+', '[2].a', 2}, {'!', '[2].b', 7}, {'#', '[2].b', 1}})
+t:update({{'!', '[2].b', 7}, {'#', '[2].b', 1}})
+-- Test bar insert of non scalar value and then changing inside it
+t = box.tuple.new({7, {a = {a = 2}}, 11})
+t:update({{'!', '[2].a.b', {x = {x = {y = 2}}}}, {'+', '[2].a.b.x.x.y', 2}})