CreateQuery DATABASE_IO (children 3)
 Identifier DATABASE_IO
 Columns definition (children 1)
  ExpressionList (children 4)
   ColumnDeclaration Application (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration Base (children 1)
    DataType LowCardinality (children 1)
     ExpressionList (children 1)
      DataType String
   ColumnDeclaration Date (children 1)
    DataType DateTime
   ColumnDeclaration Ios (children 1)
    DataType UInt32
 Storage definition (children 2)
  Function MergeTree (children 1)
   ExpressionList
  Identifier Date
