abhishekrb19 commented on code in PR #14441:
URL: https://github.com/apache/druid/pull/14441#discussion_r1241009757
##########
sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlParserUtils.java:
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@@ -302,6 +309,82 @@ public static SqlOrderBy convertClusterByToOrderBy(SqlNode
query, SqlNodeList cl
);
}
+ /**
+ * Return resolved clustered by columns specified to output columns.
+ * For example,
+ * EXPLAIN PLAN FOR
+ * INSERT INTO w000
+ * SELECT
+ * TIME_PARSE("timestamp") AS __time,
+ * page AS page_alias,
+ * FLOOR("cost"),
+ * country,
+ * citName
+ * FROM ...
+ * PARTITIONED BY DAY
+ * CLUSTERED BY 1, 2, 3, cityName
+ *
+ * The above SQL will return the following clusteredBy columns: ["__time",
"page_alias", "FLOOR(\"cost\")", cityName"]
+ * Any ordinal and expression specified in the CLUSTERED BY clause will
resolve to the final output column name.
+ * @param clusteredByNodes List of {@link SqlNode}s representing columns to
be clustered by.
+ * @param sourceNode The select or order by source node.
+ */
+ @Nullable
+ public static List<String>
resolveClusteredByColumnsToOutputColumns(SqlNodeList clusteredByNodes, SqlNode
sourceNode)
+ {
+ // CLUSTERED BY is an optional clause
+ if (clusteredByNodes == null) {
+ return null;
+ }
+
+ Preconditions.checkArgument(sourceNode instanceof SqlOrderBy || sourceNode
instanceof SqlSelect,
Review Comment:
This is basically where the output names can be extracted from:
[SqlSelect](https://calcite.apache.org/javadocAggregate/org/apache/calcite/sql/SqlSelect.html)
projections or `SqlOrderBy` since we convert them
[here](https://github.com/apache/druid/blob/master/sql/src/main/java/org/apache/druid/sql/calcite/parser/DruidSqlParserUtils.java#L278)
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