CreateQuery a (children 3)
 Identifier a
 Columns definition (children 1)
  ExpressionList (children 1)
   ColumnDeclaration a_id (children 1)
    DataType String
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList
  Function tuple (children 1)
   ExpressionList
