fix: Respect parallel argument in parquet

pola-rs · Dec 6, 2024 · 56a3f6a · 56a3f6a
1 parent e9ddd37
commit 56a3f6a
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/crates/polars-io/src/parquet/read/read_impl.rs b/crates/polars-io/src/parquet/read/read_impl.rs
@@ -886,7 +886,8 @@ pub fn read_parquet<R: MmapBytesReader>(
         let mut do_prefilter = false;
 
         do_prefilter |= prefilter_env == Ok("1"); // Force enable
-        do_prefilter |= num_live_variables * n_row_groups >= POOL.current_num_threads()
+        do_prefilter |= matches!(parallel, ParallelStrategy::Auto)
+            && num_live_variables * n_row_groups >= POOL.current_num_threads()
             && materialized_projection.len() >= num_live_variables;
 
         do_prefilter &= prefilter_env != Ok("0"); // Force disable