chucheng92 commented on code in PR #3458:
URL: https://github.com/apache/calcite/pull/3458#discussion_r1350418693
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core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
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@@ -532,26 +532,30 @@ static RelDataType deriveTypeSplit(SqlOperatorBinding
operatorBinding,
public static final SqlFunction EXTRACT_VALUE =
SqlBasicFunction.create("EXTRACTVALUE",
ReturnTypes.VARCHAR_2000.andThen(SqlTypeTransforms.FORCE_NULLABLE),
- OperandTypes.STRING_STRING);
+ OperandTypes.STRING_STRING,
Review Comment:
Hi, @mihaibudiu. thanks for reviewing. good question.
Frankly speaking, `SqlFunctionCategory` is a very loose field now. In fact,
there is no strict verification during lookup, so no test case covers it.
However, it is currently widely used and cannot be deleted for subsequent
expansion. We can refer to the comments of the current
`lookupOperatorOverloads` and use it immediately when we need it. WDYT?
https://github.com/apache/calcite/blob/597b53dbb075ab72700d40f66db81d2ac9c182b8/core/src/main/java/org/apache/calcite/sql/util/ReflectiveSqlOperatorTable.java#L94
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