Fix: Incorrect PyArrow input syntax

[andresvalle]

Iván shared with me some of the .lag files so I could finally test this repo. I got this error when trying to run the changes in PR #1 :

File "/Users/polaris/tss/LAGO_data_model/lago_data_model/reader.py", line 47, in save_as_parquet_streaming
    table = pa.table(chunk_data, schema=schema)
  File "pyarrow/table.pxi", line 6200, in pyarrow.lib.table
  File "pyarrow/table.pxi", line 4895, in pyarrow.lib.Table.from_arrays
  File "pyarrow/table.pxi", line 1621, in pyarrow.lib._sanitize_arrays
ValueError: Schema and number of arrays unequal

This happened because PyArrow expects columnar data (separate arrays for each column), not row-based dictionaries. I originally wrote chunk_data as list of dictionaries, this is a fix proposal.

[andresvalle]

Did you run into the same problem when trying to execute the code?

[andresvalle]

@ErickDiaz Also, this is how the parquet output looks like. Does it match what you where expecting?