xuzifu666 commented on code in PR #4703:
URL: https://github.com/apache/calcite/pull/4703#discussion_r2648077878
##########
core/src/main/java/org/apache/calcite/sql/fun/SqlLibraryOperators.java:
##########
@@ -2774,4 +2774,33 @@ private static RelDataType
deriveTypeMapFromEntries(SqlOperatorBinding opBinding
public static final SqlFunction RANDOM = SqlStdOperatorTable.RAND
.withName("RANDOM")
.withOperandTypeChecker(OperandTypes.NILADIC);
+
+
+ /**
+ * AGE function for PostgreSQL.
+ * Returns the interval between two timestamps in DAY TO SECOND format.
+ *
+ * @see <a
href="https://www.postgresql.org/docs/current/functions-datetime.html";>PostgreSQL
AGE</a>
+ */
+ @LibraryOperator(libraries = {POSTGRESQL}, exceptLibraries = {REDSHIFT})
Review Comment:
Currently, there is no ```DuckDB``` library, only a ```DuckDB``` dialect, so
```DuckDB``` maybe cannot be considered here.
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