cherrypick from 2.0.1hotfix to 2.0dev: use fixed function id (#20830)

原因：原先的function id用的是iota递增值。如果在中间新增了函数，会导致后面的id发生变化。
修改：functionid 用const值。新增函数追加用不重复的值。

Approved by: @badboynt1, @m-schen, @sukki37, @aunjgr, @ouyuanning

pkg/sql/plan/build_update.go

@@ -145,7 +145,12 @@ func rewriteUpdateQueryLastNode(builder *QueryBuilder, planCtxs []*dmlPlanCtx, l
 			} else {
 				pos := idx + colIdx
 				if col.OnUpdate != nil && col.OnUpdate.Expr != nil {
-					lastNode.ProjectList[pos] = col.OnUpdate.Expr
+					newDefExpr := DeepCopyExpr(col.OnUpdate.Expr)
+					err = replaceFuncId(builder.GetContext(), newDefExpr)
+					if err != nil {
+						return err
+					}
+					lastNode.ProjectList[pos] = newDefExpr
 				}
 
 				if col != nil && col.Typ.Id == int32(types.T_enum) {

pkg/sql/plan/build_util.go

@@ -30,6 +30,7 @@ import (
 	"github.com/matrixorigin/matrixone/pkg/sql/colexec"
 	"github.com/matrixorigin/matrixone/pkg/sql/parsers/dialect"
 	"github.com/matrixorigin/matrixone/pkg/sql/parsers/tree"
+	"github.com/matrixorigin/matrixone/pkg/sql/plan/function"
 	"github.com/matrixorigin/matrixone/pkg/vm/process"
 )
 
@@ -478,7 +479,33 @@ func getDefaultExpr(ctx context.Context, d *plan.ColDef) (*Expr, error) {
 			},
 		}, nil
 	}
-	return d.Default.Expr, nil
+	newDefExpr := DeepCopyExpr(d.Default.Expr)
+	err := replaceFuncId(ctx, newDefExpr)
+	return newDefExpr, err
+}
+
+func replaceFuncId(ctx context.Context, expr *Expr) error {
+	switch fun := expr.Expr.(type) {
+	case *plan.Expr_F:
+		for _, arg := range fun.F.Args {
+			err := replaceFuncId(ctx, arg)
+			if err != nil {
+				return err
+			}
+		}
+
+		fnName := fun.F.Func.ObjName
+		newFID, err := function.GetFunctionIdByName(ctx, fnName)
+		if err != nil {
+			return err
+		}
+		oldFID, oldIdx := function.DecodeOverloadID(fun.F.Func.Obj)
+		if oldFID != newFID {
+			fun.F.Func.Obj = function.EncodeOverloadID(newFID, oldIdx)
+		}
+	default:
+	}
+	return nil
 }
 
 func judgeUnixTimestampReturnType(timestr string) types.T {

pkg/sql/plan/build_util_test.go

@@ -0,0 +1,61 @@
+// Copyright 2024 Matrix Origin
+//
+// 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 plan
+
+import (
+	"context"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/matrixorigin/matrixone/pkg/pb/plan"
+	"github.com/matrixorigin/matrixone/pkg/sql/plan/function"
+)
+
+func Test_replaceFuncId(t *testing.T) {
+	case1 := &Expr{
+		Expr: &plan.Expr_F{
+			F: &plan.Function{
+				Func: &ObjectRef{
+					ObjName: "current_timestamp",
+					Obj:     function.CURRENT_TIMESTAMP,
+				},
+				Args: []*Expr{
+					{
+						Expr: &plan.Expr_Col{
+							Col: &plan.ColRef{
+								RelPos: 1,
+								ColPos: 10,
+								Name:   "a",
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+
+	err := replaceFuncId(context.Background(), case1)
+	assert.NoError(t, err)
+
+	case1ColDef := &plan.ColDef{
+		Default: &plan.Default{
+			Expr: case1,
+		},
+	}
+	case1Expr, err := getDefaultExpr(context.Background(), case1ColDef)
+	assert.NoError(t, err)
+	assert.NotNil(t, case1Expr)
+}

pkg/sql/plan/function/function.go

@@ -510,3 +510,6 @@ func (selectList *FunctionSelectList) Contains(row uint64) bool {
 	}
 	return !selectList.SelectList[row]
 }
+
+var EncodeOverloadID = encodeOverloadID
+var GetFunctionIdByName = getFunctionIdByName