CreateQuery test_simple_projection (children 3)
 Identifier test_simple_projection
 Columns definition (children 2)
  ExpressionList (children 5)
   ColumnDeclaration id (children 1)
    DataType UInt64
   ColumnDeclaration event_date (children 1)
    DataType Date
   ColumnDeclaration user_id (children 1)
    DataType UInt32
   ColumnDeclaration url (children 1)
    DataType String
   ColumnDeclaration region (children 1)
    DataType String
  ExpressionList (children 2)
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 1)
      Identifier _part_offset
     Identifier region
   Projection (children 1)
    ProjectionSelectQuery (children 2)
     ExpressionList (children 1)
      Identifier _part_offset
     Identifier user_id
 Storage definition (children 3)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList (children 2)
    Identifier event_date
    Identifier id
  Set
