Fetching data with snowflake connector throws EmptyPyArrowIterator error

Question

I use python snowflake connector in my python script (plotly dash app) and today the app stopped working without me changing the code. I tried a couple of things to find out what might be the issue and I even tried to run the example code from Snowflake documentation and I got the same error:

code:

cur = conn.cursor()
try:
    cur.execute("SELECT col1, col2 FROM test_table ORDER BY col1")
    for (col1, col2) in cur:
        print('{0}, {1}'.format(col1, col2))
finally:
    cur.close()

error:

Traceback (most recent call last):
  File "db_connection.py", line 48, in <module>
    cur.execute("SELECT col1, col2 FROM test_table ORDER BY col1")
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/snowflake/connector/cursor.py", line 580, in execute
    self._init_result_and_meta(data, _use_ijson)
  File "/Library/Frameworks/Python.framework/Versions/3.7/lib/python3.7/site-packages/snowflake/connector/cursor.py", line 630, in _init_result_and_meta
    self._result = ArrowResult(data, self, use_dict_result=self._use_dict_result)
  File "arrow_result.pyx", line 42, in snowflake.connector.arrow_result.ArrowResult.__init__
  File "arrow_result.pyx", line 156, in snowflake.connector.arrow_result.ArrowResult._reset
NameError: name 'EmptyPyArrowIterator' is not defined

The connection is established, I am capable of creating a table in my database but I cannot seem to query and iterate the data.

I am on macOS Catalina 10.15.1, snowflake-connector-python==2.1.0, Python 3.7.0.

Answer 1

You have to install pyarrow module via

pip3 install pyarrow

Installation of the snowflake connector does not automatically install it.