kasakrisz commented on code in PR #4832:
URL: https://github.com/apache/hive/pull/4832#discussion_r1391220149
##########
ql/src/java/org/apache/hadoop/hive/ql/parse/MergeSemanticAnalyzer.java:
##########
@@ -17,40 +17,31 @@
*/
package org.apache.hadoop.hive.ql.parse;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.HashSet;
-import java.util.List;
-import java.util.Map;
-import java.util.Set;
-
-import org.apache.commons.lang3.StringUtils;
-import org.apache.hadoop.fs.Path;
+import org.antlr.runtime.TokenRewriteStream;
import org.apache.hadoop.hive.conf.HiveConf;
-import org.apache.hadoop.hive.metastore.Warehouse;
import org.apache.hadoop.hive.metastore.api.FieldSchema;
-import org.apache.hadoop.hive.metastore.api.MetaException;
import org.apache.hadoop.hive.ql.Context;
import org.apache.hadoop.hive.ql.ErrorMsg;
import org.apache.hadoop.hive.ql.QueryState;
-import org.apache.hadoop.hive.ql.io.AcidUtils;
import org.apache.hadoop.hive.ql.lib.Node;
-import org.apache.hadoop.hive.ql.metadata.HiveException;
import org.apache.hadoop.hive.ql.metadata.HiveUtils;
import org.apache.hadoop.hive.ql.metadata.Table;
-import org.apache.hadoop.hive.ql.parse.ParseUtils.ReparseResult;
-import org.apache.hadoop.hive.ql.session.SessionState;
+import org.apache.hadoop.hive.ql.parse.rewrite.MergeRewriter;
+import org.apache.hadoop.hive.ql.parse.rewrite.MergeRewriterFactory;
-/**
- * A subclass of the {@link org.apache.hadoop.hive.ql.parse.SemanticAnalyzer}
that just handles
- * merge statements. It works by rewriting the updates and deletes into insert
statements (since
- * they are actually inserts) and then doing some patch up to make them work
as merges instead.
- */
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.IdentityHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+
Review Comment:
added
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