caicancai commented on code in PR #4289:
URL: https://github.com/apache/calcite/pull/4289#discussion_r2033568451
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core/src/main/java/org/apache/calcite/sql/validate/SqlConformance.java:
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@@ -102,6 +102,16 @@ public interface SqlConformance {
*/
boolean isGroupByAlias();
+ /**
+ * Whether to allow aliases from the {@code SELECT} clause to be used as
+ * column names in the same {@code SELECT} clause.
+ * E.g., SELECT 1 as X, X+1 as Y;
+ * Name lookup considers an identifier in the same SELECT only
+ * if other lookups failed.
+ * Supported by Spark, Snowflake, BigQuery.
Review Comment:
I see. @NobiGo Which version of Spark did you verify this on? Can you tell
me? I can verify this on DataRisks later.
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