Add comment about randomized testing

apache · Mar 27, 2024 · c936ef0 · c936ef0
1 parent 224df9f
commit c936ef0
Showing 1 changed file with 4 additions and 0 deletions.
diff --git a/arrow-ipc/src/writer.rs b/arrow-ipc/src/writer.rs
@@ -2275,6 +2275,10 @@ mod tests {
     fn test_decimal128_alignment16() {
         const IPC_ALIGNMENT: u8 = 16;
 
+        // Test a bunch of different dimensions to ensure alignment is never an issue.
+        // For example, if we only test `num_cols = 1` then even with alignment 8 this
+        // test would _happen_ to pass, even though for different dimensions like
+        // `num_cols = 2` it would fail.
         for num_cols in 1..100 {
             let num_rows = (num_cols * 7 + 11) % 100; // Deterministic swizzle