CreateQuery test_groupConcat (children 3)
 Identifier test_groupConcat
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration p_int (children 1)
    DataType Int32
   ColumnDeclaration p_string (children 1)
    DataType String
   ColumnDeclaration p_array (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType Int32
 Storage definition (children 2)
  Function MergeTree
  Identifier id
