kangpinghuang commented on a change in pull request #2573: implements create 
drop show index syntax for bitmap index [#2487]
URL: https://github.com/apache/incubator-doris/pull/2573#discussion_r361605201
 
 

 ##########
 File path: fe/src/main/java/org/apache/doris/analysis/AlterTableStmt.java
 ##########
 @@ -61,7 +66,41 @@ public void analyze(Analyzer analyzer) throws 
AnalysisException, UserException {
             
ErrorReport.reportAnalysisException(ErrorCode.ERR_NO_ALTER_OPERATION);
         }
         for (AlterClause op : ops) {
-            op.analyze(analyzer);
+            if (op instanceof CreateIndexClause) {
+                Table table = 
Catalog.getInstance().getDb(tbl.getDb()).getTable(tbl.getTbl());
+                if (table instanceof OlapTable) {
+                    op.analyze(analyzer);
+                    List<Index> indexes = ((OlapTable) table).getIndexes();
+                    IndexDef indexDef = ((CreateIndexClause) op).getIndexDef();
+                    for (Index idx : indexes) {
+                        if 
(idx.getIndexName().equalsIgnoreCase(indexDef.getIndexName())) {
+                            throw new AnalysisException("index `" + 
indexDef.getIndexName()  + "` already exist.");
+                        }
+                    }
+                }
+            } else if (op instanceof DropIndexClause) {
 
 Review comment:
   do we support just modifying index name?

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