How to use the ddlparse.DdlParse.NAME_CASE.lower function in ddlparse

parser.source_database = DdlParse.DATABASE.oracle
parser.ddl = sample_ddl
table = parser.parse()

print("* BigQuery Fields * : Oracle")
print(table.to_bigquery_fields())


print("* TABLE *")
print("schema = {} : name = {} : is_temp = {}".format(table.schema, table.name, table.is_temp))

print("* BigQuery Fields *")
print(table.to_bigquery_fields())

print("* BigQuery Fields - column name to lower case / upper case *")
print(table.to_bigquery_fields(DdlParse.NAME_CASE.lower))
print(table.to_bigquery_fields(DdlParse.NAME_CASE.upper))

print("* COLUMN *")
for col in table.columns.values():
    col_info = {}
    col_info["name"] = col.name
    col_info["data_type"] = col.data_type
    col_info["length"] = col.length
    col_info["precision(=length)"] = col.precision
    col_info["scale"] = col.scale
    col_info["is_unsigned"] = col.is_unsigned
    col_info["is_zerofill"] = col.is_zerofill
    col_info["constraint"] = col.constraint
    col_info["not_null"] = col.not_null
    col_info["PK"] = col.primary_key
    col_info["unique"] = col.unique

col_info["constraint"] = col.constraint
    col_info["not_null"] = col.not_null
    col_info["PK"] = col.primary_key
    col_info["unique"] = col.unique
    col_info["bq_legacy_data_type"] = col.bigquery_legacy_data_type
    col_info["bq_standard_data_type"] = col.bigquery_standard_data_type
    col_info["comment"] = col.comment
    col_info["description(=comment)"] = col.description
    col_info["bigquery_field"] = json.loads(col.to_bigquery_field())
    print(json.dumps(col_info, indent=2, ensure_ascii=False))

print("* DDL (CREATE TABLE) statements *")
print(table.to_bigquery_ddl())

print("* DDL (CREATE TABLE) statements - dataset name, table name and column name to lower case / upper case *")
print(table.to_bigquery_ddl(DdlParse.NAME_CASE.lower))
print(table.to_bigquery_ddl(DdlParse.NAME_CASE.upper))

print("* Get Column object (case insensitive) *")
print(table.columns["total"])