CreateQuery t1__fuzz_26 (children 3)
 Identifier t1__fuzz_26
 Columns definition (children 1)
  ExpressionList (children 3)
   ColumnDeclaration a (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Float64
   ColumnDeclaration b (children 1)
    DataType Nullable (children 1)
     ExpressionList (children 1)
      DataType Float32
   ColumnDeclaration pk (children 1)
    DataType Int64
 Storage definition (children 2)
  Function MergeTree
  Identifier pk
