CreateQuery session (children 3)
 Identifier session
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration day (children 1)
    DataType Date
   ColumnDeclaration uid (children 1)
    DataType String
   ColumnDeclaration dummy (children 2)
    DataType String
    Literal \'\'
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier day
    Identifier uid
