mihaibudiu commented on code in PR #4289:
URL: https://github.com/apache/calcite/pull/4289#discussion_r2038528682
##########
core/src/main/java/org/apache/calcite/sql/validate/SqlConformance.java:
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@@ -102,6 +102,28 @@ public interface SqlConformance {
*/
boolean isGroupByAlias();
+ /**
+ * Value describing how to perform lookup for values defined in a SELECT
statement.
+ */
+ enum SelectAliasLookup {
+ /** Values defined in a SELECT statement are not visible within the
statement. */
+ UNSUPPORTED,
+ /** Values defined in a SELECT statement are visible to the right of their
definition. */
+ LEFT_TO_RIGHT,
Review Comment:
If 'x' exists in the FROM, it is used from the FROM.
Only when lookup in the FROM fails it is made in the local SELECT.
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