class_docstr: Delete Table Statement constructed after parsing the input query
  
  Attributes:
      TableRef: table reference in the delete table statement
      _where_clause : predicate of the select query, represented as a expression tree.
code: def __str__(self) -> str:
      delete_str = f"DELETE FROM {self._table_ref}"
      if self._where_clause is not None:
          delete_str += " WHERE " + str(self._where_clause)
  
      return delete_str
  
file_path: evadb/evadb/parser/delete_statement.py
imports: from evadb.expression.abstract_expression import AbstractExpression
  from evadb.parser.statement import AbstractStatement
  from evadb.parser.table_ref import TableRef
  from evadb.parser.types import StatementType
label_desc: Use image node_id 2 for calling the DeleteTableStatement obj's underlying member method code with example usage: obj.__str__() and returns: delete_str