CreateQuery t_uniq_exact (children 3)
 Identifier t_uniq_exact
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration a (children 1)
    DataType UInt64
   ColumnDeclaration b (children 1)
    DataType String
   ColumnDeclaration c (children 1)
    DataType UInt64
 Storage definition (children 2)
  Function MergeTree
  Identifier a
