CreateQuery alter_bug (children 3)
 Identifier alter_bug
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration epoch (children 2)
    DataType UInt64
    Function CODEC (children 1)
     ExpressionList (children 2)
      Function Delta
      Function LZ4
   ColumnDeclaration _time_dec (children 1)
    DataType Float64
 Storage definition (children 2)
  Function MergeTree
  Identifier epoch
