lincoln-lil commented on code in PR #20359:
URL: https://github.com/apache/flink/pull/20359#discussion_r938582541
##########
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/hint/FlinkHints.java:
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@@ -75,4 +85,77 @@ public static Map<String, String> mergeTableOptions(
newProps.putAll(hints);
return Collections.unmodifiableMap(newProps);
}
+
+ public static Optional<String> getTableAlias(RelNode node) {
+ if (node instanceof Hintable) {
+ Hintable aliasNode = (Hintable) node;
+ List<String> aliasNames =
+ aliasNode.getHints().stream()
+ .filter(h ->
h.hintName.equalsIgnoreCase(FlinkHints.HINT_ALIAS))
+ .flatMap(h -> h.listOptions.stream())
+ .collect(Collectors.toList());
+ if (aliasNames.size() > 0) {
+ return Optional.of(aliasNames.get(0));
+ } else {
+ if (canTransposeToTableScan(node)) {
+ return getTableAlias(node.getInput(0));
+ }
+ }
+ }
+ return Optional.empty();
+ }
+
+ public static boolean canTransposeToTableScan(RelNode node) {
+ // TODO support look up join
+ return node instanceof LogicalProject // computed column on table
+ || node instanceof LogicalFilter;
+ }
+
+ /** Returns the qualified name of a table scan, otherwise returns empty. */
+ public static Optional<String> getTableName(RelOptTable table) {
+ if (table == null) {
+ return Optional.empty();
+ }
+ List<String> qualifiedNames = table.getQualifiedName();
Review Comment:
should use table identifier instead?
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