Liya Fan created CALCITE-4363:
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Summary: Need a utility to check if a SQL operator is standard
Key: CALCITE-4363
URL: https://issues.apache.org/jira/browse/CALCITE-4363
Project: Calcite
Issue Type: Wish
Components: core
Reporter: Liya Fan
Assignee: Liya Fan
Currently, all standard SQL operators are defined in SqlStdOperatorTable.java
as static members, not as enums. This makes it difficult to check if a SQL
function is a standard one.
In many scenarios, we need such a check. For example, some optimizations can be
performed, if we know the function is standard (not user-defined), because
user-defined functions may have some unknown side-effects.
To support the check, we only need to maintain a set that contains all standard
operators.
Do you think such a utility should be supported?
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