CreateQuery optimize_lazy_materialization_with_compact_mt (children 3)
 Identifier optimize_lazy_materialization_with_compact_mt
 Columns definition (children 1)
  ExpressionList (children 5)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration b (children 1)
    DataType UInt64
   ColumnDeclaration c (children 1)
    DataType UInt64
   ColumnDeclaration d (children 1)
    DataType UInt64
   ColumnDeclaration n (children 1)
    DataType Nested (children 1)
     ExpressionList (children 1)
      NameTypePair x (children 1)
       DataType String
 Storage definition (children 4)
  Function MergeTree (children 1)
   ExpressionList
  Identifier b
  Identifier a
  Set
