bug: BigQuery backend table.to_pyarrow_batches is not honoring the chunk_size parameter

[ruiyang2015]

What happened?

for following code for bigquery:

c = ibis.bigquery.connect(...)
t = c.table('some table')
for y in t.to_pyarrow_batches(chunk_size=1_000_000):  # <- change this parameter does not take effect
  print(y.num_rows)

for our case, the record returned is always 4k rows instead of larger set we expect. tried same code for Duckdb/Snowflake, both can return proper sized pyarrow table

What version of ibis are you using?

9.0.0

What backend(s) are you using, if any?

BigQuery

Relevant log output

No response

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