CreateQuery alter_drop_version (children 3)
 Identifier alter_drop_version
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration key (children 1)
    DataType UInt64
   ColumnDeclaration value (children 1)
    DataType String
   ColumnDeclaration ver (children 1)
    DataType Int8
 Storage definition (children 2)
  Function ReplacingMergeTree (children 1)
   ExpressionList (children 1)
    Identifier ver
  Identifier key