Fix TableWriteTest compression selection (facebookincubator#7141)

Summary:
The test was reading the wrong bits representing the compression value.
Instead it was reading the multiDriver (0 or 1) setting which resulted in either no compression or ZLIB compression (1) instead of ZSTD (4).

Pull Request resolved: facebookincubator#7141

Reviewed By: amitkdutta

Differential Revision: D50539168

Pulled By: xiaoxmeng

fbshipit-source-id: 1a7fff44f44fc1e49333a1c894f2508e65ba2fb7

velox/exec/tests/TableWriteTest.cpp

@@ -137,7 +137,7 @@ struct TestParam {
 
   CompressionKind compressionKind() const {
     return static_cast<facebook::velox::common::CompressionKind>(
-        (value & ((1L << 48) - 1)) >> 40);
+        (value & ((1L << 56) - 1)) >> 48);
   }
 
   bool multiDrivers() const {
@@ -167,13 +167,14 @@ struct TestParam {
 
   std::string toString() const {
     return fmt::format(
-        "FileFormat[{}] TestMode[{}] commitStrategy[{}] bucketKind[{}] bucketSort[{}] multiDrivers[{}]",
+        "FileFormat[{}] TestMode[{}] commitStrategy[{}] bucketKind[{}] bucketSort[{}] multiDrivers[{}] compression[{}]",
         fileFormat(),
         testMode(),
         commitStrategy(),
         bucketKind(),
         bucketSort(),
-        multiDrivers());
+        multiDrivers(),
+        compressionKindToString(compressionKind()));
   }
 };