CreateQuery alter_attach (children 3)
 Identifier alter_attach
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration x (children 1)
    DataType UInt64
   ColumnDeclaration p (children 1)
    DataType UInt8
 Storage definition (children 3)
  Function MergeTree
  Identifier p
  Function tuple (children 1)
   ExpressionList