yanlin-Lynn commented on a change in pull request #1534: [CALCITE-3450] Support
Intersect and Minus in RelMdTableReferences.
URL: https://github.com/apache/calcite/pull/1534#discussion_r339289527
##########
File path:
core/src/main/java/org/apache/calcite/rel/metadata/RelMdTableReferences.java
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@@ -183,6 +185,72 @@ protected RelMdTableReferences() {}
return result;
}
+ /**
+ * Table references from Intersect.
+ */
+ public Set<RelTableRef> getTableReferences(Intersect intersect, final
RelMetadataQuery mq) {
+ final Set<RelTableRef> result = new HashSet<>();
+
+ final Multimap<List<String>, RelTableRef> qualifiedNamesToRefs =
HashMultimap.create();
+ for (RelNode input : intersect.getInputs()) {
+ final Map<RelTableRef, RelTableRef> currentTablesMapping = new
HashMap<>();
+ final Set<RelTableRef> inputTableRefs = mq.getTableReferences(input);
+ if (inputTableRefs == null) {
+ return null;
+ }
+ for (RelTableRef tableRef : inputTableRefs) {
+ int shift = 0;
+ Collection<RelTableRef> lRefs = qualifiedNamesToRefs.get(
+ tableRef.getQualifiedName());
+ if (lRefs != null) {
+ shift = lRefs.size();
+ }
+ RelTableRef shiftTableRef = RelTableRef.of(
+ tableRef.getTable(), shift + tableRef.getEntityNumber());
+ assert !result.contains(shiftTableRef);
+ result.add(shiftTableRef);
+ currentTablesMapping.put(tableRef, shiftTableRef);
+ }
+ for (RelTableRef newRef : currentTablesMapping.values()) {
+ qualifiedNamesToRefs.put(newRef.getQualifiedName(), newRef);
+ }
+ }
+ return result;
+ }
+
+ /**
+ * Table references from Minus.
+ */
+ public Set<RelTableRef> getTableReferences(Minus minus, final
RelMetadataQuery mq) {
+ final Set<RelTableRef> result = new HashSet<>();
+
+ final Multimap<List<String>, RelTableRef> qualifiedNamesToRefs =
HashMultimap.create();
+ for (RelNode input : minus.getInputs()) {
+ final Map<RelTableRef, RelTableRef> currentTablesMapping = new
HashMap<>();
+ final Set<RelTableRef> inputTableRefs = mq.getTableReferences(input);
+ if (inputTableRefs == null) {
+ return null;
+ }
+ for (RelTableRef tableRef : inputTableRefs) {
+ int shift = 0;
+ Collection<RelTableRef> lRefs = qualifiedNamesToRefs.get(
+ tableRef.getQualifiedName());
+ if (lRefs != null) {
+ shift = lRefs.size();
+ }
+ RelTableRef shiftTableRef = RelTableRef.of(
+ tableRef.getTable(), shift + tableRef.getEntityNumber());
+ assert !result.contains(shiftTableRef);
+ result.add(shiftTableRef);
+ currentTablesMapping.put(tableRef, shiftTableRef);
+ }
+ for (RelTableRef newRef : currentTablesMapping.values()) {
+ qualifiedNamesToRefs.put(newRef.getQualifiedName(), newRef);
+ }
+ }
+ return result;
+ }
+
Review comment:
The implementation for getTableReferences of `Minus` and `Intersect` is
basically the same with `Union`. Can you just put them together?
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