zstan commented on code in PR #4328:
URL: https://github.com/apache/calcite/pull/4328#discussion_r2065966787
##########
core/src/main/java/org/apache/calcite/sql2rel/RelFieldTrimmer.java:
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@@ -473,6 +479,107 @@ public TrimResult trimFields(
return result(newCalc, mapping, calc);
}
+ /**
+ * Shuttle that finds all {@link TableScan}`s inside a given {@link RelNode}.
+ */
+ private static class TableScanCollector extends RelHomogeneousShuttle {
+ private ImmutableSet.Builder<List<String>> builder =
ImmutableSet.builder();
+
+ /** Qualified names. */
+ Set<List<String>> tables() {
+ return builder.build();
+ }
+
+ @Override public RelNode visit(TableScan scan) {
+ builder.add(scan.getTable().getQualifiedName());
+ return super.visit(scan);
+ }
+ }
+
+ /**
+ * Shuttle that finds all {@link TableScan}`s inside a given {@link RexNode}.
+ */
+ private static class InputTablesVisitor extends RexVisitorImpl<Void> {
Review Comment:
if you talk about `RexVisitorImpl(boolean deep)` i\`l fix it
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