How to use

getSource

method

in

com.facebook.presto.sql.tree.RenameColumn

@Override
protected Void visitRenameColumn(RenameColumn node, Integer context)
{
  builder.append("ALTER TABLE ")
      .append(node.getTable())
      .append(" RENAME COLUMN ")
      .append(node.getSource())
      .append(" TO ")
      .append(node.getTarget());
  return null;
}

    .orElseThrow(() -> new SemanticException(MISSING_TABLE, statement, "Table '%s' does not exist", tableName));
String source = statement.getSource().getValue().toLowerCase(ENGLISH);
String target = statement.getTarget().getValue().toLowerCase(ENGLISH);

@Override
protected Void visitRenameColumn(RenameColumn node, Integer context) {
  builder.append("ALTER TABLE ")
      .append(node.getTable())
      .append(" RENAME COLUMN ")
      .append(node.getSource())
      .append(" TO ")
      .append(node.getTarget());
  return null;
}

@Override
protected Void visitRenameColumn(RenameColumn node, Integer context)
{
  builder.append("ALTER TABLE ")
      .append(node.getTable())
      .append(" RENAME COLUMN ")
      .append(node.getSource())
      .append(" TO ")
      .append(node.getTarget());
  return null;
}

@Override
protected Void visitRenameColumn(RenameColumn node, Integer context)
{
  builder.append("ALTER TABLE ")
      .append(node.getTable())
      .append(" RENAME COLUMN ")
      .append(node.getSource())
      .append(" TO ")
      .append(node.getTarget());
  return null;
}

@Override
protected Void visitRenameColumn(RenameColumn node, Integer context)
{
  builder.append("ALTER TABLE ")
      .append(node.getTable())
      .append(" RENAME COLUMN ")
      .append(node.getSource())
      .append(" TO ")
      .append(node.getTarget());
  return null;
}

  @Override
  public CompletableFuture<?> execute(RenameColumn statement, TransactionManager transactionManager, Metadata metadata, AccessControl accessControl, QueryStateMachine stateMachine)
  {
    Session session = stateMachine.getSession();
    QualifiedObjectName tableName = createQualifiedObjectName(session, statement, statement.getTable());
    Optional<TableHandle> tableHandle = metadata.getTableHandle(session, tableName);

    String source = statement.getSource().toLowerCase(ENGLISH);
    String target = statement.getTarget().toLowerCase(ENGLISH);

    if (!tableHandle.isPresent()) {
      throw new SemanticException(MISSING_TABLE, statement, "Table '%s' does not exist", tableName);
    }
    accessControl.checkCanRenameColumn(session.getRequiredTransactionId(), session.getIdentity(), tableName);

    Map<String, ColumnHandle> columnHandles = metadata.getColumnHandles(session, tableHandle.get());
    if (!columnHandles.containsKey(source)) {
      throw new SemanticException(MISSING_COLUMN, statement, "Column '%s' does not exist", source);
    }

    if (columnHandles.containsKey(target)) {
      throw new SemanticException(COLUMN_ALREADY_EXISTS, statement, "Column '%s' already exists", target);
    }
    metadata.renameColumn(session, tableHandle.get(), columnHandles.get(source), target);

    return completedFuture(null);
  }
}