CreateQuery t_serialization_hints (children 3)
 Identifier t_serialization_hints
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration b (children 1)
    DataType UInt64
   ColumnDeclaration c (children 1)
    DataType Array (children 1)
     ExpressionList (children 1)
      DataType String
 Storage definition (children 3)
  Function MergeTree
  Identifier a
  Set
