在flink sql中，如何检查字符串是数字，as
select * from input where str like '\d+'
正则表达式似乎没有用，"类似于"操作员也无法正常工作。有一些想法吗？
尝试在此处定义标量函数，
https://ci.apache.org/projects/flink/flink/flink-docs-release-1.7/dev/table/udfs.html#scalar-functions
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