chore: import upstream snapshot with attribution

server/functions/binary/mod.go

@@ -0,0 +1,104 @@
+// 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 binary
+
+import (
+	"github.com/cockroachdb/apd/v3"
+	"github.com/cockroachdb/errors"
+	"github.com/dolthub/go-mysql-server/sql"
+	"github.com/dolthub/go-mysql-server/sql/types"
+
+	"github.com/dolthub/doltgresql/server/functions/framework"
+	pgtypes "github.com/dolthub/doltgresql/server/types"
+)
+
+// These functions can be gathered using the following query from a Postgres 15 instance:
+// SELECT * FROM pg_operator o WHERE o.oprname = '%' ORDER BY o.oprcode::varchar;
+
+// initBinaryMod registers the functions to the catalog.
+func initBinaryMod() {
+	framework.RegisterBinaryFunction(framework.Operator_BinaryMod, int2mod)
+	framework.RegisterBinaryFunction(framework.Operator_BinaryMod, int4mod)
+	framework.RegisterBinaryFunction(framework.Operator_BinaryMod, int8mod)
+	framework.RegisterBinaryFunction(framework.Operator_BinaryMod, numeric_mod)
+}
+
+// int2mod represents the PostgreSQL function of the same name, taking the same parameters.
+var int2mod = framework.Function2{
+	Name:       "int2mod",
+	Return:     pgtypes.Int16,
+	Parameters: [2]*pgtypes.DoltgresType{pgtypes.Int16, pgtypes.Int16},
+	Strict:     true,
+	Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
+		if val2.(int16) == 0 {
+			return nil, errors.Errorf("division by zero")
+		}
+		return val1.(int16) % val2.(int16), nil
+	},
+}
+
+// int4mod represents the PostgreSQL function of the same name, taking the same parameters.
+var int4mod = framework.Function2{
+	Name:       "int4mod",
+	Return:     pgtypes.Int32,
+	Parameters: [2]*pgtypes.DoltgresType{pgtypes.Int32, pgtypes.Int32},
+	Strict:     true,
+	Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
+		if val2.(int32) == 0 {
+			return nil, errors.Errorf("division by zero")
+		}
+		return val1.(int32) % val2.(int32), nil
+	},
+}
+
+// int8mod represents the PostgreSQL function of the same name, taking the same parameters.
+var int8mod = framework.Function2{
+	Name:       "int8mod",
+	Return:     pgtypes.Int64,
+	Parameters: [2]*pgtypes.DoltgresType{pgtypes.Int64, pgtypes.Int64},
+	Strict:     true,
+	Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
+		if val2.(int64) == 0 {
+			return nil, errors.Errorf("division by zero")
+		}
+		return val1.(int64) % val2.(int64), nil
+	},
+}
+
+// numeric_mod represents the PostgreSQL function of the same name, taking the same parameters.
+var numeric_mod = framework.Function2{
+	Name:       "numeric_mod",
+	Return:     pgtypes.Numeric,
+	Parameters: [2]*pgtypes.DoltgresType{pgtypes.Numeric, pgtypes.Numeric},
+	Strict:     true,
+	Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
+		num1 := val1.(*apd.Decimal)
+		num2 := val2.(*apd.Decimal)
+		if num1.Form == apd.NaN || num2.Form == apd.NaN ||
+			(num1.Form == apd.Infinite && num2.Form == apd.Infinite) {
+			return pgtypes.NumericNaN, nil
+		}
+		if num2.IsZero() {
+			return nil, errors.Errorf("division by zero")
+		}
+		if num1.Form == apd.Infinite {
+			return num1, nil
+		}
+		if num2.Form == apd.Infinite {
+			return apd.New(0, 0), nil
+		}
+		return types.DecimalMod(num1, num2)
+	},
+}