crud: fix Get options

Before this patch, `vshard_router`, `fields`, `bucket_id`, `mode`,
`prefer_replica`, `balance` were either ignored or had a wrong name.
This patch fixes the issue.

CHANGELOG.md

@@ -55,6 +55,8 @@ Versioning](http://semver.org/spec/v2.0.0.html) except to the first release.
 - Incorrect decoding of an MP_DECIMAL when the `scale` value is negative (#314)
 - Incorrect options (`after`, `batch_size` and `force_map_call`) setup for
   crud.SelectRequest (#320)
+- Incorrect options (`vshard_router`, `fields`, `bucket_id`, `mode`,
+  `prefer_replica`, `balance`) setup for crud.GetRequest (#335)
 
 ## [1.12.0] - 2023-06-07
 

crud/get.go

@@ -42,10 +42,11 @@ func (opts GetOpts) EncodeMsgpack(enc *msgpack.Encoder) error {
 	exists := [optsCnt]bool{}
 	values[0], exists[0] = opts.Timeout.Get()
 	values[1], exists[1] = opts.VshardRouter.Get()
-	values[1], exists[1] = opts.BucketId.Get()
-	values[2], exists[2] = opts.Mode.Get()
-	values[3], exists[3] = opts.PreferReplica.Get()
-	values[4], exists[4] = opts.Balance.Get()
+	values[2], exists[2] = opts.Fields.Get()
+	values[3], exists[3] = opts.BucketId.Get()
+	values[4], exists[4] = opts.Mode.Get()
+	values[5], exists[5] = opts.PreferReplica.Get()
+	values[6], exists[6] = opts.Balance.Get()
 
 	return encodeOptions(enc, names[:], values[:], exists[:])
 }

crud/tarantool_test.go

@@ -57,6 +57,7 @@ var countOpts = crud.CountOpts{
 
 var getOpts = crud.GetOpts{
 	Timeout: crud.MakeOptUint(timeout),
+	Mode:    crud.MakeOptString("read"),
 }
 
 var minOpts = crud.MinOpts{