CreateQuery tab (children 3)
 Identifier tab
 Columns definition (children 1)
  ExpressionList (children 5)
   ColumnDeclaration a (children 2)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Int64
    Function STATISTICS (children 1)
     ExpressionList (children 4)
      Function countmin
      Function minmax
      Function tdigest
      Function uniq
   ColumnDeclaration b (children 2)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType String
    Function STATISTICS (children 1)
     ExpressionList (children 2)
      Function countmin
      Function uniq
   ColumnDeclaration c (children 2)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType Nullable (children 1)
       ExpressionList (children 1)
        DataType Int64
    Function STATISTICS (children 1)
     ExpressionList (children 4)
      Function countmin
      Function minmax
      Function tdigest
      Function uniq
   ColumnDeclaration d (children 2)
    DataType DateTime
    Function STATISTICS (children 1)
     ExpressionList (children 4)
      Function countmin
      Function minmax
      Function tdigest
      Function uniq
   ColumnDeclaration pk (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier pk
