CreateQuery t_bad_constraint (children 3)
 Identifier t_bad_constraint
 Columns definition (children 2)
  ExpressionList (children 2)
   ColumnDeclaration a (children 1)
    DataType UInt32
   ColumnDeclaration s (children 1)
    DataType String
  ExpressionList (children 1)
   Constraint (children 1)
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier a
      Function toUInt32 (children 1)
       ExpressionList (children 1)
        Identifier s
 Storage definition (children 2)
  Function MergeTree
  Function tuple (children 1)
   ExpressionList