CreateQuery alter_test (children 3)
 Identifier alter_test
 Columns definition (children 1)
  ExpressionList (children 6)
   ColumnDeclaration CounterID (children 1)
    DataType UInt32
   ColumnDeclaration StartDate (children 1)
    DataType Date
   ColumnDeclaration UserID (children 1)
    DataType UInt32
   ColumnDeclaration VisitID (children 1)
    DataType UInt32
   ColumnDeclaration NestedColumn (children 1)
    DataType Nested (children 1)
     ExpressionList (children 2)
      NameTypePair A (children 1)
       DataType UInt8
      NameTypePair S (children 1)
       DataType String
   ColumnDeclaration ToDrop (children 1)
    DataType UInt32
 Storage definition (children 1)
  Function MergeTree (children 1)
   ExpressionList (children 4)
    Identifier StartDate
    Function intHash32 (children 1)
     ExpressionList (children 1)
      Identifier UserID
    Function tuple (children 1)
     ExpressionList (children 4)
      Identifier CounterID
      Identifier StartDate
      Function intHash32 (children 1)
       ExpressionList (children 1)
        Identifier UserID
      Identifier VisitID
    Literal UInt64_8192