CreateQuery test_length_string (children 3)
 Identifier test_length_string
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration s.size (children 1)
    DataType UInt64
   ColumnDeclaration s (children 1)
    DataType String
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
