message: fix csv related issue in test
diff: @@ -11,7 +11,7 @@ statement ok
  pragma threads=4;
  statement ok
  -CREATE TABLE bigdata AS FROM generate_series (9999);
  +CREATE TABLE bigdata AS SELECT i AS col_a, i AS col_b FROM range(0,10000) tbl(i);
  statement ok
  COPY (FROM bigdata) TO '__TEST_DIR__/per_thread_output' (FORMAT PARQUET, PER_THREAD_OUTPUT TRUE);
  @@ -34,7 +34,7 @@ statement ok
  COPY (FROM bigdata) TO '__TEST_DIR__/per_thread_output_csv' (FORMAT CSV, HEADER TRUE, PER_THREAD_OUTPUT TRUE);
  query I
  -SELECT COUNT(*) FROM '__TEST_DIR__/per_thread_output_csv/*.csv';
  +SELECT COUNT(*) FROM read_csv('__TEST_DIR__/per_thread_output_csv/*.csv', columns={'col_a': 'INT', 'col_b' : 'INT'}, header=True);
  ----
  10000
  