Support CASESENSITIVE on Tag field (#161)

* Support CASESENSITIVE on Tag field
Co-authored-by: Chayim <chayim@users.noreply.github.com>

Author: Avital-Fine

redisearch/schema.go

@@ -169,10 +169,11 @@ type TextFieldOptions struct {
 // TagFieldOptions options for indexing tag fields
 type TagFieldOptions struct {
 	// Separator is the custom separator between tags. defaults to comma (,)
-	Separator byte
-	NoIndex   bool
-	Sortable  bool
-	As        string
+	Separator     byte
+	NoIndex       bool
+	Sortable      bool
+	CaseSensitive bool
+	As            string
 }
 
 // NumericFieldOptions Options for numeric fields
@@ -232,7 +233,7 @@ func NewTagField(name string) Field {
 	return Field{
 		Name:    name,
 		Type:    TagField,
-		Options: TagFieldOptions{Separator: ',', NoIndex: false},
+		Options: TagFieldOptions{Separator: ',', NoIndex: false, CaseSensitive: false},
 	}
 }
 
@@ -427,6 +428,9 @@ func serializeField(f Field, args redis.Args) (argsOut redis.Args, err error) {
 			if opts.NoIndex {
 				argsOut = append(argsOut, "NOINDEX")
 			}
+			if opts.CaseSensitive {
+				argsOut = append(argsOut, "CASESENSITIVE")
+			}
 		}
 	case GeoField:
 		argsOut = append(argsOut, f.Name, "GEO")

redisearch/schema_test.go

@@ -75,6 +75,7 @@ func TestSerializeSchema(t *testing.T) {
 		{"default-and-tag", args{NewSchema(DefaultOptions).AddField(NewTagField("tag-field")), redis.Args{}}, redis.Args{"SCHEMA", "tag-field", "TAG", "SEPARATOR", ","}, false},
 		{"default-and-tag-with-options", args{NewSchema(DefaultOptions).AddField(NewTagFieldOptions("tag-field", TagFieldOptions{Sortable: true, NoIndex: false, Separator: byte(','), As: "field"})), redis.Args{}}, redis.Args{"SCHEMA", "tag-field", "AS", "field", "TAG", "SEPARATOR", ",", "SORTABLE"}, false},
 		{"default-and-tag-with-options_2", args{NewSchema(DefaultOptions).AddField(NewTagFieldOptions("tag-field", TagFieldOptions{Sortable: true, NoIndex: true, Separator: byte(','), As: "field"})), redis.Args{}}, redis.Args{"SCHEMA", "tag-field", "AS", "field", "TAG", "SEPARATOR", ",", "SORTABLE", "NOINDEX"}, false},
+		{"default-and-tag-with-options_3", args{NewSchema(DefaultOptions).AddField(NewTagFieldOptions("tag-field", TagFieldOptions{Separator: byte(','), CaseSensitive: true, As: "field"})), redis.Args{}}, redis.Args{"SCHEMA", "tag-field", "AS", "field", "TAG", "SEPARATOR", ",", "CASESENSITIVE"}, false},
 		{"default-geo-with-options", args{NewSchema(DefaultOptions).AddField(NewGeoFieldOptions("location", GeoFieldOptions{As: "loc"})), redis.Args{}}, redis.Args{"SCHEMA", "location", "AS", "loc", "GEO"}, false},
 		{"default-geo-with-options_2", args{NewSchema(DefaultOptions).AddField(NewGeoFieldOptions("location", GeoFieldOptions{As: "loc", NoIndex: true})), redis.Args{}}, redis.Args{"SCHEMA", "location", "AS", "loc", "GEO", "NOINDEX"}, false},
 		{"default-vector", args{NewSchema(DefaultOptions).AddField(NewVectorFieldOptions("vec", VectorFieldOptions{Algorithm: Flat, Attributes: map[string]interface{}{"DIM": 128}})), redis.Args{}}, redis.Args{"SCHEMA", "vec", "VECTOR", Flat, 2, "DIM", 128}, false},