odps-sdk/odps-sdk-mapred/src/main/java/com/aliyun/odps/pipeline/Pipeline.java [152:161]:
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    private String getPrefixedJoinedString(String[] colList, String prefix) {
      StringBuilder sb = new StringBuilder();
      for (String s : colList) {
        if (sb.length() > 0) {
          sb.append(",");
        }
        sb.append(prefix).append(s);
      }
      return sb.toString();
    }
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odps-sdk-impl/odps-mapred-bridge/src/main/java/com/aliyun/odps/mapred/bridge/sqlgen/SqlGenContext.java [156:165]:
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  private String getPrefixedJoinedString(String[] colList, String prefix) {
    StringBuilder sb = new StringBuilder();
    for (String s : colList) {
      if (sb.length() > 0) {
        sb.append(",");
      }
      sb.append(prefix).append(s);
    }
    return sb.toString();
  }
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