CreateQuery parent (children 3)
 Identifier parent
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration a_id (children 1)
    DataType Int64
   ColumnDeclaration b_id (children 1)
    DataType Int64
   ColumnDeclaration c_id (children 1)
    DataType Int64
   ColumnDeclaration created_at (children 1)
    DataType Int64
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList (children 4)
    Identifier a_id
    Identifier b_id
    Identifier c_id
    Identifier created_at
