CreateQuery mt_compact (children 3)
 Identifier mt_compact
 Columns definition (children 1)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType Int
   ColumnDeclaration s (children 1)
    DataType String
 Storage definition (children 4)
  Function MergeTree
  Identifier a
  Identifier a
  Set