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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2018/08/21 06:01:50 UTC

[GitHub] xccui commented on issue #6576: [FLINK-10145][table] Add replace supported in TableAPI and SQL

xccui commented on issue #6576: [FLINK-10145][table] Add replace supported in TableAPI and SQL
URL: https://github.com/apache/flink/pull/6576#issuecomment-414559283
 
 
   Hi @Guibo-Pan, in SQL convention, any null argument will lead to a null result. Thus when generating a scalar function call, all the arguments (expressions) will be first checked to ensure not null. See https://github.com/apache/flink/blob/d5de2bcf122fd931080ac7a9edc704c93dbe15ee/flink-libraries/flink-table/src/main/scala/org/apache/flink/table/codegen/CodeGenerator.scala#L406

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