CreateQuery check_comments (children 3)
 Identifier check_comments
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration column_name1 (children 3)
    DataType UInt8
    Literal UInt64_1
    Literal \'comment\'
   ColumnDeclaration column_name2 (children 2)
    DataType UInt8
    Literal \'non default comment\'
 Storage definition (children 2)
  Function ReplicatedMergeTree (children 1)
   ExpressionList (children 2)
    Literal \'/clickhouse/tables/{database}/test_00753/comments\'
    Literal \'r1\'
  Identifier column_name1