[fix](Nereids) fix insert into table with null literal default value (#…

…39122) (#39669)

cherry-pick: #39122

Problem:
when use insert with default value null, it can not be insert
successfully
Solved:
when column is allow to be null, it can be null in create table with
null default value

## Proposed changes

Issue Number: close #xxx

<!--Describe your changes.-->

fe/fe-core/src/main/java/org/apache/doris/analysis/NativeInsertStmt.java

@@ -920,11 +920,15 @@ private void analyzeRow(Analyzer analyzer, List<Column> targetColumns, List<Arra
  Column col = targetColumns.get(i);
 
  if (expr instanceof DefaultValueExpr) {
- if (targetColumns.get(i).getDefaultValue() == null) {
+ if (targetColumns.get(i).getDefaultValue() == null && !targetColumns.get(i).isAllowNull()) {
  throw new AnalysisException("Column has no default value, column="
  + targetColumns.get(i).getName());
  }
- expr = new StringLiteral(targetColumns.get(i).getDefaultValue());
+ if (targetColumns.get(i).getDefaultValue() == null) {
+ expr = new NullLiteral();
+ } else {
+ expr = new StringLiteral(targetColumns.get(i).getDefaultValue());
+ }
  }
  if (expr instanceof Subquery) {
  throw new AnalysisException("Insert values can not be query");

fe/fe-core/src/main/java/org/apache/doris/catalog/Column.java

@@ -498,6 +498,9 @@ public String getDefaultValue() {
  }
 
  public Expr getDefaultValueExpr() throws AnalysisException {
+ if (defaultValue == null) {
+ return null;
+ }
  StringLiteral defaultValueLiteral = new StringLiteral(defaultValue);
  if (getDataType() == PrimitiveType.VARCHAR) {
  return defaultValueLiteral;

fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/BindSink.java

@@ -344,7 +344,7 @@ private static Map<String, NamedExpression> getColumnToOutput(
  } else if (column.getDefaultValue() == null) {
  // throw exception if explicitly use Default value but no default value present
  // insert into table t values(DEFAULT)
- if (columnToChildOutput.get(column) instanceof DefaultValueSlot) {
+ if (columnToChildOutput.get(column) instanceof DefaultValueSlot && !column.isAllowNull()) {
  throw new AnalysisException("Column has no default value,"
  + " column=" + column.getName());
  }

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/plans/commands/insert/InsertUtils.java

@@ -397,7 +397,9 @@ public static TableIf getTargetTable(Plan plan, ConnectContext ctx) {
  private static NamedExpression generateDefaultExpression(Column column) {
  try {
  if (column.getDefaultValue() == null) {
- throw new AnalysisException("Column has no default value, column=" + column.getName());
+ if (!column.isAllowNull()) {
+ throw new AnalysisException("Column has no default value, column=" + column.getName());
+ }
  }
  if (column.getDefaultValueExpr() != null) {
  Expression defualtValueExpression = new NereidsParser().parseExpression(