xiarixiaoyao commented on a change in pull request #3668:
URL: https://github.com/apache/hudi/pull/3668#discussion_r717192565



##########
File path: 
hudi-client/hudi-client-common/src/main/java/org/apache/hudi/client/AbstractHoodieWriteClient.java
##########
@@ -213,6 +224,27 @@ protected void commit(HoodieTable table, String 
commitActionType, String instant
                       List<HoodieWriteStat> stats) throws IOException {
     LOG.info("Committing " + instantTime + " action " + commitActionType);
     HoodieActiveTimeline activeTimeline = table.getActiveTimeline();
+    // do save internal schema to support Implicitly add columns in write 
process

Review comment:
       > We need to introduce a config to enable/disable schema evolution. Only 
if the config is enables, we should let any side-effects of schema evolution to 
take effect.
   
   may no need introduce a config.  only when user execute alter SQL /alter api 
explicitly, schema evolution will take effect; Otherwise, everything goes 
through the original process




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