SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 8)
    Identifier event_type
    Identifier merge_reason
    Identifier table
    Identifier part_name
    Identifier partition_id
    Identifier partition
    Identifier rows
    Identifier merged_from
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.part_log
   Function and (children 1)
    ExpressionList (children 2)
     Function equals (children 1)
      ExpressionList (children 2)
       Identifier database
       Function currentDatabase (children 1)
        ExpressionList
     Function in (children 1)
      ExpressionList (children 2)
       Identifier event_type
       Literal Tuple_(\'MergePartsStart\', \'MergeParts\', \'MutatePartStart\', \'MutatePart\')
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier event_time_microseconds
 Identifier Vertical
