code: def string_literal(self, tree):
      text = tree.children[0]
      assert text is not None
      return ConstantValueExpression(text[1:-1], ColumnType.TEXT)
  
imports: import numpy
  from lark import Tree
  from evadb.catalog.catalog_type import ColumnType
  from evadb.expression.abstract_expression import ExpressionType
  from evadb.expression.comparison_expression import ComparisonExpression
  from evadb.expression.constant_value_expression import ConstantValueExpression
  from evadb.expression.logical_expression import LogicalExpression
  from evadb.utils.generic_utils import string_comparison_case_insensitive
label_desc: Use image node_id 1 for calling the Expressions obj's underlying member method code with example usage: obj.string_literal(tree) and returns: ConstantValueExpression