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  1. Flink
  2. FLINK-16526

Fix exception when computed column expression references a keyword column name

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      json_row          ROW<`timestamp` BIGINT>,
      `timestamp`   AS `json_row`.`timestamp`
      

      It translate to "SELECT json_row.timestamp FROM _temp_table_"
      Throws exception "Encountered ". timestamp" at line 1, column 157. Was expecting one of:..."

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              jark Jark Wu
              liuyufei YufeiLiu
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