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[CALCITE-1389] Add a rule to rewrite queries to use materialized views involving joins #284

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[CALCITE-1389] Add a rule to rewrite queries to use materialized views involving joins #284

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25 changes: 25 additions & 0 deletions core/src/main/java/org/apache/calcite/plan/RelOptUtil.java
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,7 @@
import org.apache.calcite.rel.core.RelFactories;
import org.apache.calcite.rel.core.SemiJoin;
import org.apache.calcite.rel.core.Sort;
import org.apache.calcite.rel.core.TableScan;
import org.apache.calcite.rel.externalize.RelJsonWriter;
import org.apache.calcite.rel.externalize.RelWriterImpl;
import org.apache.calcite.rel.externalize.RelXmlWriter;
Expand Down Expand Up @@ -196,6 +197,30 @@ public static boolean isOrder(RelNode rel) {
return false;
}

/**
* Returns a set of tables used by this expression or its children
*/
public static Set<RelOptTable> findTables(RelNode rel) {
return new LinkedHashSet<RelOptTable>(findAllTables(rel));
}

/**
* Returns a list of all tables used by this expression or its children
*/
public static List<RelOptTable> findAllTables(RelNode rel) {
final List<RelOptTable> usedTables = new ArrayList<>();
new RelVisitor() {
@Override public void visit(RelNode node, int ordinal, RelNode parent) {
if (node instanceof TableScan) {
usedTables.add(node.getTable());
}
super.visit(node, ordinal, parent);
}
// CHECKSTYLE: IGNORE 1
}.go(rel);
return usedTables;
}

/**
* Returns a list of variables set by a relational expression or its
* descendants.
Expand Down
22 changes: 3 additions & 19 deletions core/src/main/java/org/apache/calcite/plan/volcano/VolcanoPlanner.java
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Original file line number Diff line number Diff line change
Expand Up @@ -47,7 +47,6 @@
import org.apache.calcite.rel.RelVisitor;
import org.apache.calcite.rel.convert.Converter;
import org.apache.calcite.rel.convert.ConverterRule;
import org.apache.calcite.rel.core.TableScan;
import org.apache.calcite.rel.metadata.JaninoRelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMetadataProvider;
import org.apache.calcite.rel.metadata.RelMetadataQuery;
Expand Down Expand Up @@ -103,7 +102,6 @@
import java.util.HashSet;
import java.util.IdentityHashMap;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Map;
import java.util.Set;
Expand Down Expand Up @@ -460,7 +458,7 @@ private void useApplicableMaterializations() {
final List<RelOptMaterialization> applicableMaterializations =
getApplicableMaterializations(originalRoot, materializations);
useMaterializations(originalRoot, applicableMaterializations);
final Set<RelOptTable> queryTables = findTables(originalRoot);
final Set<RelOptTable> queryTables = RelOptUtil.findTables(originalRoot);

// Use a lattice if the query uses at least the central (fact) table of the
// lattice.
Expand Down Expand Up @@ -503,7 +501,7 @@ public static List<RelOptMaterialization> getApplicableMaterializations(RelNode
final List<String> qname = materialization.table.getQualifiedName();
qnameMap.put(qname, materialization);
for (RelOptTable usedTable
: findTables(materialization.queryRel)) {
: RelOptUtil.findTables(materialization.queryRel)) {
usesGraph.addVertex(qname);
usesGraph.addVertex(usedTable.getQualifiedName());
usesGraph.addEdge(usedTable.getQualifiedName(), qname);
Expand All @@ -516,7 +514,7 @@ public static List<RelOptMaterialization> getApplicableMaterializations(RelNode
// actually use.)
final Graphs.FrozenGraph<List<String>, DefaultEdge> frozenGraph =
Graphs.makeImmutable(usesGraph);
final Set<RelOptTable> queryTablesUsed = findTables(root);
final Set<RelOptTable> queryTablesUsed = RelOptUtil.findTables(root);
final List<RelOptMaterialization> applicableMaterializations = Lists.newArrayList();
for (List<String> qname : TopologicalOrderIterator.of(usesGraph)) {
RelOptMaterialization materialization = qnameMap.get(qname);
Expand Down Expand Up @@ -546,20 +544,6 @@ private static boolean usesTable(
return false;
}

private static Set<RelOptTable> findTables(RelNode rel) {
final Set<RelOptTable> usedTables = new LinkedHashSet<>();
new RelVisitor() {
@Override public void visit(RelNode node, int ordinal, RelNode parent) {
if (node instanceof TableScan) {
usedTables.add(node.getTable());
}
super.visit(node, ordinal, parent);
}
// CHECKSTYLE: IGNORE 1
}.go(rel);
return usedTables;
}

/**
* Finds an expression's equivalence set. If the expression is not
* registered, returns null.
Expand Down
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