Youjun Yuan created CALCITE-3395:
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Summary: add BuiltinMethod for Substring(String, int)
Key: CALCITE-3395
URL: https://issues.apache.org/jira/browse/CALCITE-3395
Project: Calcite
Issue Type: Improvement
Components: core
Reporter: Youjun Yuan
substring function has two versoins:
1, Substring(String, int, int)
2, Substring(String, int)
currently in BuiltinMethod.java, only the first one is defined. Need to define
the second one as well, so that we can use both of them.
Apache Flink(FunctionGenerator.scala), reference the BuiltinMethod, since
Calcite only defines 1, not 2, Flink always resolve SUBSTRING to
Substring(String, int, int) even if there is only 2 parameters. This problem
happens to be covered by method overloading of java, but it's still a potential
problem.
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