AmatyaAvadhanula commented on code in PR #12404:
URL: https://github.com/apache/druid/pull/12404#discussion_r887043479


##########
server/src/main/java/org/apache/druid/metadata/SQLMetadataConnector.java:
##########
@@ -327,6 +331,29 @@ tableName, getPayloadType()
         )
     );
   }
+  
+  public boolean tableContainsColumn(Handle handle, String table, String 
column)
+  {
+    try {
+      DatabaseMetaData databaseMetaData = handle.getConnection().getMetaData();
+      ResultSet columns = databaseMetaData.getColumns(
+          null,
+          null,
+          table,
+          column
+      );
+      return columns.next();
+    }
+    catch (SQLException e) {
+      return false;
+    }
+  }
+  
+  public void prepareTaskEntryTable(final String tableName)
+  {
+    createEntryTable(tableName);

Review Comment:
   Also wanted to confirm if you meant avoiding additional db calls to check 
and update the schema by "no alert needs to be run". Could you please clarify 
that?



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