How can I get col_names?

[hai1y1kr]

cursor.description return None

[anikolaienko]

What's your query? My returns correctly in cursor.description

[hai1y1kr]

What's your query? My returns correctly in cursor.description
This is my function，and all the cursor.description is None for different querys.
def read_table(self, sql_sentence= r'show tables'):
if self.is_connected():
logger.debug('='*40)
logger.debug('Executing: ' + sql_sentence)
start_time = time.time()
try:
if self.plantform == 'presto':
sentence_1 = 'set session hive.parquet_fail_with_corrupted_statistics = false'
self.cursor.execute(sentence_1)
self.cursor.fetchall()
self.cursor.execute(sql_sentence)
self.con.commit()
col_names = self.cursor.description
rows = self.cursor.fetchall()
logger.info('Got rows: ' + str(len(rows)) + ' time consumed: ' + str(time.time() - start_time))
except Exception as e:
logger.error('read table failed: ' + str(e))
return rows, col_names
else:
logger.warn('warning: disconnected')