fix: Fix withIntDistributionForField copy (#11644)

Summary:
For decimal(8, 5) data build, Arrow reports below error due to out of range.
The reason is in the copy of 'withIntDistributionForField', the target index
and source index are reversed.
```
`C++ exception with description "Invalid: Invalid cast from Decimal128 to 4 byte integer" thrown in the test body.
```

Pull Request resolved: #11644

Reviewed By: Yuhta

Differential Revision: D66560309

Pulled By: bikramSingh91

fbshipit-source-id: bd594f67a58b92915ea3bf24bee3a311db11eb04

velox/dwio/common/tests/utils/DataSetBuilder.h

@@ -98,7 +98,7 @@ 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) {

velox/dwio/parquet/tests/reader/E2EFilterTest.cpp

@@ -357,9 +357,11 @@ 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)",
        }) {
@@ -386,9 +388,11 @@ 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)",
        }) {