SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Function arrayFilter (children 1)
     ExpressionList (children 2)
      Function lambda (children 1)
       ExpressionList (children 2)
        Function tuple (children 1)
         ExpressionList (children 1)
          Identifier x
        Function notEmpty (children 1)
         ExpressionList (children 1)
          Function concat (children 1)
           ExpressionList (children 2)
            Identifier x
            Literal \'hello\'
      Literal Array_[\'\']
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.one
    TablesInSelectQueryElement (children 1)
     ArrayJoin (children 1)
      ExpressionList (children 2)
       Literal Array_[UInt64_0] (alias elem)
       Function arrayMap (alias unused) (children 1)
        ExpressionList (children 2)
         Function lambda (children 1)
          ExpressionList (children 2)
           Function tuple (children 1)
            ExpressionList (children 1)
             Identifier x
           Function concat (children 1)
            ExpressionList (children 3)
             Identifier x
             Function ignore (children 1)
              ExpressionList (children 4)
               Function ignore (children 1)
                ExpressionList (children 8)
                 Function toLowCardinality (children 1)
                  ExpressionList (children 1)
                   Literal \'03147_parquet_memory_tracking.parquet\'
                 Literal UInt64_37
                 Literal UInt64_37
                 Function toUInt128 (children 1)
                  ExpressionList (children 1)
                   Literal UInt64_37
                 Literal UInt64_37
                 Literal UInt64_37
                 Function toLowCardinality (children 1)
                  ExpressionList (children 1)
                   Literal UInt64_37
                 Literal UInt64_37
               Literal UInt64_8
               Function ignore (children 1)
                ExpressionList (children 1)
                 Function ignore (children 1)
                  ExpressionList (children 4)
                   Literal Float64_1
                   Literal UInt64_36
                   Literal UInt64_8
                   Literal UInt64_8
               Asterisk
             Literal \'hello\'
         Literal Array_[\'\']
   Function not (children 1)
    ExpressionList (children 1)
     Function ignore (children 1)
      ExpressionList (children 1)
       Identifier elem
   ExpressionList (children 2)
    Function sum (children 1)
     ExpressionList (children 1)
      Function ignore (children 1)
       ExpressionList (children 2)
        Function ignore (children 1)
         ExpressionList (children 7)
          Function ignore (children 1)
           ExpressionList (children 5)
            Literal Float64_1
            Literal UInt64_1
            Literal UInt64_36
            Literal UInt64_8
            Literal UInt64_8
          Function ignore (children 1)
           ExpressionList (children 12)
            Literal UInt64_52
            Literal UInt64_37
            Literal UInt64_37
            Literal \'03147_parquet_memory_tracking.parquet\'
            Literal UInt64_37
            Literal UInt64_37
            Function toUInt256 (children 1)
             ExpressionList (children 1)
              Literal UInt64_37
            Literal UInt64_37
            Literal UInt64_37
            Function toNullable (children 1)
             ExpressionList (children 1)
              Literal UInt64_37
            Literal UInt64_37
            Literal UInt64_37
          Literal Float64_1
          Literal UInt64_1
          Literal UInt64_36
          Literal UInt64_8
          Literal UInt64_8
        Function emptyArrayToSingle (children 1)
         ExpressionList (children 1)
          Function arrayMap (children 1)
           ExpressionList (children 2)
            Function lambda (children 1)
             ExpressionList (children 2)
              Function tuple (children 1)
               ExpressionList (children 1)
                Identifier x
              Function toString (children 1)
               ExpressionList (children 1)
                Identifier x
            Function arrayMap (children 1)
             ExpressionList (children 2)
              Function lambda (children 1)
               ExpressionList (children 2)
                Function tuple (children 1)
                 ExpressionList (children 1)
                  Identifier x
                Function nullIf (children 1)
                 ExpressionList (children 2)
                  Identifier x
                  Literal UInt64_2
              Function arrayJoin (children 1)
               ExpressionList (children 1)
                Literal Array_[Array_[UInt64_1]]
    Function modulo (children 1)
     ExpressionList (children 3)
      Function toLowCardinality (children 1)
       ExpressionList (children 1)
        Literal \'03147_parquet_memory_tracking.parquet\'
      Identifier number
      Function toLowCardinality (children 1)
       ExpressionList (children 1)
        Literal UInt64_3