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https://issues.apache.org/jira/browse/PHOENIX-6343?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17273771#comment-17273771
 ] 

ASF GitHub Bot commented on PHOENIX-6343:
-----------------------------------------

gjacoby126 commented on a change in pull request #1118:
URL: https://github.com/apache/phoenix/pull/1118#discussion_r566146481



##########
File path: 
phoenix-core/src/it/java/org/apache/phoenix/end2end/CreateTableIT.java
##########
@@ -90,6 +91,113 @@ public void testStartKeyStopKey() throws SQLException {
         assertTrue(splits.size() > 0);
     }
 
+    @Test
+    public void testCreateAlterTableWithDuplicateColumn() throws Exception {
+        Properties props = new Properties();
+        int failureCount = 0;
+        int expectedExecCount = 0;
+        String tableName = generateUniqueName();
+        String viewName = generateUniqueName();
+        try (Connection conn = DriverManager.getConnection(getUrl(), props)) {
+            try {
+                conn.createStatement().execute(String.format("CREATE TABLE %s"

Review comment:
       nit: Would be good if before each case there was a brief comment 
explaining it -- e.g "Same column name, different column type" for the third 
one. 




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> Phoenix allows duplicate column names when one of them is a primary key
> -----------------------------------------------------------------------
>
>                 Key: PHOENIX-6343
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-6343
>             Project: Phoenix
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 5.0.0, 4.15.0
>            Reporter: Istvan Toth
>            Assignee: Viraj Jasani
>            Priority: Major
>             Fix For: 5.1.0, 4.16.1, 4.17.0
>
>
> {code:sql}
> CREATE TABLE IF NOT EXISTS test_duplicate_columns (
> name VARCHAR NOT NULL PRIMARY KEY,
> city VARCHAR, name VARCHAR);
> {code}
> {noformat}
> select * from test_duplicate_columns;
> +------+------+------+
> | NAME | CITY | NAME |
> +------+------+------+
> +------+------+------+
> No rows selected (0.015 seconds)
> {noformat}



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