CreateQuery check_query_comment_column (children 3)
 Identifier check_query_comment_column
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration first_column (children 2)
    DataType UInt8
    Literal \'comment 1\'
   ColumnDeclaration second_column (children 2)
    DataType UInt8
    Literal \'comment 2\'
   ColumnDeclaration third_column (children 2)
    DataType UInt8
    Literal \'comment 3\'
 Storage definition (children 4)
  Function MergeTree (children 1)
   ExpressionList
  Identifier second_column
  Identifier first_column
  Identifier first_column