fix: fix import data with null value

Author: nichenqin

packages/persistence/src/record/record.mutate-visitor.ts

@@ -69,10 +69,6 @@ export class RecordMutateVisitor extends AbstractQBMutationVisitor implements IR
     private readonly eb: ExpressionBuilder<any, any>,
   ) {
     super()
-    const mutableFields = this.table.schema.mutableFields
-    for (const field of mutableFields) {
-      this.setData(field.id.value, null)
-    }
   }
 
   idIn(spec: IdIn): void {

packages/table/src/modules/records/record/record-values.vo.ts

@@ -29,7 +29,7 @@ export class RecordValuesVO extends ValueObject {
     const values: RecordValues = {}
 
     for (const field of fields) {
-      const value = dto[field.id.value] ?? dto[field.name.value]
+      const value = dto[field.id.value] ?? dto[field.name.value] ?? null
       const fieldValue: Option<MutableFieldValue> = value === undefined ? None : FieldValueFactory.create(field, value)
 
       let v: MutableFieldValue | undefined = undefined