chore: import upstream snapshot with attribution

server/functions/rtrim.go

@@ -0,0 +1,62 @@
+// Copyright 2024 Dolthub, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package functions
+
+import (
+	"github.com/dolthub/go-mysql-server/sql"
+
+	"github.com/dolthub/doltgresql/server/functions/framework"
+	pgtypes "github.com/dolthub/doltgresql/server/types"
+)
+
+// initRtrim registers the functions to the catalog.
+func initRtrim() {
+	framework.RegisterFunction(rtrim_text)
+	framework.RegisterFunction(rtrim_text_text)
+}
+
+// rtrim_text represents the PostgreSQL function of the same name, taking the same parameters.
+var rtrim_text = framework.Function1{
+	Name:       "rtrim",
+	Return:     pgtypes.Text,
+	Parameters: [1]*pgtypes.DoltgresType{pgtypes.Text},
+	Strict:     true,
+	Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val1 any) (any, error) {
+		var unusedTypes [3]*pgtypes.DoltgresType
+		return rtrim_text_text.Callable(ctx, unusedTypes, val1, " ")
+	},
+}
+
+// rtrim_text_text represents the PostgreSQL function of the same name, taking the same parameters.
+var rtrim_text_text = framework.Function2{
+	Name:       "rtrim",
+	Return:     pgtypes.Text,
+	Parameters: [2]*pgtypes.DoltgresType{pgtypes.Text, pgtypes.Text},
+	Strict:     true,
+	Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, str any, characters any) (any, error) {
+		runes := []rune(str.(string))
+		trimChars := make(map[rune]struct{})
+		for _, c := range characters.(string) {
+			trimChars[c] = struct{}{}
+		}
+		trimIdx := len(runes)
+		for ; trimIdx > 0; trimIdx-- {
+			if _, ok := trimChars[runes[trimIdx-1]]; !ok {
+				break
+			}
+		}
+		return string(runes[:trimIdx]), nil
+	},
+}