diff --git a/bolt/dwio/common/tests/utils/DataSetBuilder.h b/bolt/dwio/common/tests/utils/DataSetBuilder.h
index cb74f2f08..62e7e78cb 100644
--- a/bolt/dwio/common/tests/utils/DataSetBuilder.h
+++ b/bolt/dwio/common/tests/utils/DataSetBuilder.h
@@ -111,7 +111,7 @@ class DataSetBuilder {
         if (counter % 100 < repeats) {
           numbers->set(row, T(counter % repeats));
         } else if (counter % 100 > 90 && row > 0) {
-          numbers->copy(numbers, row - 1, row, 1);
+          numbers->copy(numbers, row, row - 1, 1);
         } else {
           int64_t value;
           if (rareFrequency && counter % rareFrequency == 0) {
diff --git a/bolt/dwio/parquet/tests/reader/E2EFilterTest.cpp b/bolt/dwio/parquet/tests/reader/E2EFilterTest.cpp
index a09d21cc7..c62b49b06 100644
--- a/bolt/dwio/parquet/tests/reader/E2EFilterTest.cpp
+++ b/bolt/dwio/parquet/tests/reader/E2EFilterTest.cpp
@@ -344,9 +344,11 @@ TEST_F(E2EFilterTest, floatAndDouble) {
 }
 
 TEST_F(E2EFilterTest, shortDecimalDictionary) {
+  // decimal(8, 5) maps to 4 bytes FLBA in Parquet.
   // decimal(10, 5) maps to 5 bytes FLBA in Parquet.
   // decimal(17, 5) maps to 8 bytes FLBA in Parquet.
   for (const auto& type : {
+           "shortdecimal_val:decimal(8, 5)",
            "shortdecimal_val:decimal(10, 5)",
            "shortdecimal_val:decimal(17, 5)",
        }) {
@@ -373,9 +375,11 @@ TEST_F(E2EFilterTest, shortDecimalDirect) {
   options_.enableDictionary = false;
   options_.dataPageSize = 4 * 1024;
 
+  // decimal(8, 5) maps to 4 bytes FLBA in Parquet.
   // decimal(10, 5) maps to 5 bytes FLBA in Parquet.
   // decimal(17, 5) maps to 8 bytes FLBA in Parquet.
   for (const auto& type : {
+           "shortdecimal_val:decimal(8, 5)",
            "shortdecimal_val:decimal(10, 5)",
            "shortdecimal_val:decimal(17, 5)",
        }) {