xiarixiaoyao commented on a change in pull request #4253:
URL: https://github.com/apache/hudi/pull/4253#discussion_r765414682



##########
File path: 
hudi-client/hudi-spark-client/src/main/java/org/apache/hudi/io/storage/row/HoodieRowParquetWriteSupport.java
##########
@@ -46,13 +53,32 @@
   public HoodieRowParquetWriteSupport(Configuration conf, StructType 
structType, BloomFilter bloomFilter, HoodieWriteConfig writeConfig) {
     super();
     Configuration hadoopConf = new Configuration(conf);
-    hadoopConf.set("spark.sql.parquet.writeLegacyFormat", 
writeConfig.parquetWriteLegacyFormatEnabled());
+    hadoopConf.set("spark.sql.parquet.writeLegacyFormat", 
findSmallPrecisionDecimalType(structType) ? "true" : 
writeConfig.parquetWriteLegacyFormatEnabled());

Review comment:
       @codope  thanks for your review。
   yes,I think if findsmallprecisiondecimaltype returns false, we need respect 
the user's settings; if findsmallprecisiondecimaltype returns true,we need 
ignore user's choice, because the user's choosie may lead  the failure of 
subsequent updating of the Hudi table




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