[GitHub] flink pull request #4128: [FLINK-6893][table]Add BIN supported in SQL

[haohui]

Github user haohui commented on a diff in the pull request:

    https://github.com/apache/flink/pull/4128#discussion_r140702758
  
    --- Diff: 
flink-libraries/flink-table/src/main/scala/org/apache/flink/table/functions/sql/ScalarSqlFunctions.scala
 ---
    @@ -33,6 +33,14 @@ object ScalarSqlFunctions {
         OperandTypes.NILADIC,
         SqlFunctionCategory.NUMERIC)
     
    +  val BIN = new SqlFunction(
    +    "BIN",
    +    SqlKind.OTHER_FUNCTION,
    +    ReturnTypes.explicit(SqlTypeName.VARCHAR),
    +    null,
    +    OperandTypes.NUMERIC,
    --- End diff --
    
    You can construct a checker easily using `OperandTypes.or()` in Calcite.


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