NobiGo commented on code in PR #4462:
URL: https://github.com/apache/calcite/pull/4462#discussion_r2193697860
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core/src/main/java/org/apache/calcite/sql/validate/SqlConformance.java:
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@@ -662,4 +662,18 @@ enum SelectAliasLookup {
* True when the unsigned versions of integer types are supported.
*/
boolean supportsUnsignedTypes();
+
+ /**
+ * Whether to convert empty string to null..
+ *
+ * <p>Consider the {@code SUBSTRING} operator. SUBSTRING('abc', 0, 0) will
+ * return null in Oracle, and return an empty string in other databases
+ * like MySQL, PostgreSQL, SQL Server that support SUBSTRING function.
+ *
+ * <p>Among the built-in conformance levels, true in
+ * {@link SqlConformanceEnum#ORACLE_10},
+ * {@link SqlConformanceEnum#ORACLE_12};
+ * false otherwise.
+ */
+ boolean emptyStringIsNull();
Review Comment:
Ok
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