refactor(interactive): Support Unfold Operation in Cypher Queries (#…

…4241)

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## What do these changes do?
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Fixes

---------

Co-authored-by: BingqingLyu <[email protected]>

.github/workflows/gaia.yml

@@ -88,8 +88,9 @@ jobs:
       run: |
         cd ${GITHUB_WORKSPACE}/interactive_engine/executor/ir/integrated
         cargo test --features=mimalloc
-        cd ${GITHUB_WORKSPACE}/interactive_engine/executor/store/groot
-        cargo test --features=mimalloc
+        # TODO: With mimalloc, it may occur buffer overflow in groot store test sometimes. Currently, we do not use mimalloc (as default) in groot store.
+        # cd ${GITHUB_WORKSPACE}/interactive_engine/executor/store/groot
+        # cargo test --features=mimalloc
 
     - name: Ir Integration Test on Experimental Store
       run: |

docs/interactive_engine/neo4j/supported_cypher.md

@@ -140,6 +140,7 @@ RETURN a, b, c;
 | WHERE NOT EXIST (an edge/path) | implements as anti join  |  <input type="checkbox" checked  />|  |
 | ORDER BY |  | <input type="checkbox" disabled checked />  |  |
 | LIMIT |  | <input type="checkbox" disabled checked />  |    |
+| UNFOLD | The operation is similar to SQL's 'UNSET', as it unfolds elements from a collection type | <input type="checkbox" disabled checked />  |    |
 
 Additionally, we support two types of procedure call invocations in Cypher:
 - We offer a set of built-in procedures that can be invoked directly within Cypher queries. These procedures are all prefixed with `gs.procedure.`.

interactive_engine/compiler/src/main/antlr4/CypherGS.g4

@@ -52,7 +52,7 @@ CALL : ( 'C' | 'c' ) ( 'A' | 'a' ) ( 'L' | 'l' ) ( 'L' | 'l' ) ;
 YIELD : ( 'Y' | 'y' ) ( 'I' | 'i' ) ( 'E' | 'e' ) ( 'L' | 'l' ) ( 'D' | 'd' ) ;
 
 oC_RegularQuery
-     :  oC_Match ( SP? ( oC_Match | oC_With ) )* ( SP oC_Return ) ;
+     :  oC_Match ( SP? ( oC_Match | oC_With | oC_Unwind ) )* ( SP oC_Return ) ;
 
 oC_Match
      :  ( OPTIONAL SP )? MATCH SP? oC_Pattern ( SP? oC_Where )? ;
@@ -61,6 +61,11 @@ MATCH : ( 'M' | 'm' ) ( 'A' | 'a' ) ( 'T' | 't' ) ( 'C' | 'c' ) ( 'H' | 'h' ) ;
 
 OPTIONAL : ( 'O' | 'o' ) ( 'P' | 'p' ) ( 'T' | 't' ) ( 'I' | 'i' ) ( 'O' | 'o' ) ( 'N' | 'n' ) ( 'A' | 'a' ) ( 'L' | 'l' ) ;
 
+oC_Unwind
+      :  UNWIND SP? oC_Expression SP AS SP oC_Variable ;
+
+UNWIND : ( 'U' | 'u' ) ( 'N' | 'n' ) ( 'W' | 'w' ) ( 'I' | 'i' ) ( 'N' | 'n' ) ( 'D' | 'd' ) ;
+
 // multiple sentences
 oC_Pattern
        :  oC_PatternPart ( SP? ',' SP? oC_PatternPart )* ;

interactive_engine/compiler/src/main/java/com/alibaba/graphscope/common/ir/rel/GraphLogicalUnfold.java

@@ -0,0 +1,95 @@
+/*
+ *
+ *  * Copyright 2020 Alibaba Group Holding Limited.
+ *  *
+ *  * Licensed under the Apache License, Version 2.0 (the "License");
+ *  * you may not use this file except in compliance with the License.
+ *  * You may obtain a copy of the License at
+ *  *
+ *  * http://www.apache.org/licenses/LICENSE-2.0
+ *  *
+ *  * Unless required by applicable law or agreed to in writing, software
+ *  * distributed under the License is distributed on an "AS IS" BASIS,
+ *  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  * See the License for the specific language governing permissions and
+ *  * limitations under the License.
+ *
+ */
+
+package com.alibaba.graphscope.common.ir.rel;
+
+import com.alibaba.graphscope.common.ir.tools.AliasInference;
+import com.alibaba.graphscope.common.ir.tools.Utils;
+
+import org.apache.calcite.plan.GraphOptCluster;
+import org.apache.calcite.plan.RelTraitSet;
+import org.apache.calcite.rel.RelNode;
+import org.apache.calcite.rel.RelShuttle;
+import org.apache.calcite.rel.RelWriter;
+import org.apache.calcite.rel.SingleRel;
+import org.apache.calcite.rel.type.*;
+import org.apache.calcite.rex.RexNode;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.util.List;
+import java.util.stream.Collectors;
+
+public class GraphLogicalUnfold extends SingleRel {
+    private final RexNode key;
+    private final String aliasName;
+    private final int aliasId;
+
+    public GraphLogicalUnfold(
+            GraphOptCluster cluster, RelNode input, RexNode key, @Nullable String aliasName) {
+        super(cluster, RelTraitSet.createEmpty(), input);
+        this.key = key;
+        this.aliasName =
+                AliasInference.inferDefault(
+                        aliasName, AliasInference.getUniqueAliasList(input, true));
+        this.aliasId = cluster.getIdGenerator().generate(this.aliasName);
+    }
+
+    public RexNode getUnfoldKey() {
+        return this.key;
+    }
+
+    @Override
+    public RelWriter explainTerms(RelWriter pw) {
+        return super.explainTerms(pw).item("key", key).item("alias", aliasName);
+    }
+
+    @Override
+    public RelDataType deriveRowType() {
+        RelDataType inputOutputType = Utils.getOutputType(input);
+        List<RelDataTypeField> fields =
+                inputOutputType.getFieldList().stream()
+                        .filter(k -> k.getIndex() != AliasInference.DEFAULT_ID)
+                        .collect(Collectors.toList());
+        fields.add(
+                new RelDataTypeFieldImpl(
+                        this.aliasName, this.aliasId, key.getType().getComponentType()));
+        return new RelRecordType(StructKind.FULLY_QUALIFIED, fields);
+    }
+
+    @Override
+    public GraphLogicalUnfold copy(RelTraitSet traitSet, List<RelNode> inputs) {
+        return new GraphLogicalUnfold(
+                (GraphOptCluster) getCluster(), inputs.get(0), this.key, this.aliasName);
+    }
+
+    @Override
+    public RelNode accept(RelShuttle shuttle) {
+        if (shuttle instanceof GraphShuttle) {
+            return ((GraphShuttle) shuttle).visit(this);
+        }
+        return shuttle.visit(this);
+    }
+
+    public String getAliasName() {
+        return this.aliasName;
+    }
+
+    public int getAliasId() {
+        return this.aliasId;
+    }
+}

interactive_engine/compiler/src/main/java/com/alibaba/graphscope/common/ir/rel/GraphShuttle.java

@@ -101,6 +101,10 @@ public RelNode visit(LogicalJoin join) {
         return visitChildren(join);
     }
 
+    public RelNode visit(GraphLogicalUnfold unfold) {
+        return visitChildren(unfold);
+    }
+
     @Override
     public RelNode visit(RelNode other) {
         if (other instanceof MultiJoin) {

interactive_engine/compiler/src/main/java/com/alibaba/graphscope/common/ir/runtime/proto/GraphRelToProtoConverter.java

@@ -962,6 +962,37 @@ public RelNode visit(MultiJoin multiJoin) {
         return multiJoin;
     }
 
+    @Override
+    public RelNode visit(GraphLogicalUnfold unfold) {
+        visitChildren(unfold);
+        RexNode unfoldKey = unfold.getUnfoldKey();
+        Preconditions.checkArgument(
+                unfoldKey instanceof RexGraphVariable,
+                "unfold key should be a variable, but is [%s]",
+                unfoldKey);
+        int keyAliasId = ((RexGraphVariable) unfoldKey).getAliasId();
+        GraphAlgebraPhysical.Unfold.Builder unfoldBuilder =
+                GraphAlgebraPhysical.Unfold.newBuilder().setTag(Utils.asAliasId(keyAliasId));
+        if (unfold.getAliasId() != AliasInference.DEFAULT_ID) {
+            unfoldBuilder.setAlias(Utils.asAliasId(unfold.getAliasId()));
+        }
+        List<RelDataTypeField> fullFields = unfold.getRowType().getFieldList();
+        Preconditions.checkArgument(!fullFields.isEmpty(), "there is no fields in unfold row type");
+        RelDataType curRowType =
+                new RelRecordType(
+                        StructKind.FULLY_QUALIFIED,
+                        fullFields.subList(fullFields.size() - 1, fullFields.size()));
+        physicalBuilder.addPlan(
+                GraphAlgebraPhysical.PhysicalOpr.newBuilder()
+                        .setOpr(
+                                GraphAlgebraPhysical.PhysicalOpr.Operator.newBuilder()
+                                        .setUnfold(unfoldBuilder)
+                                        .build())
+                        .addAllMetaData(Utils.physicalProtoRowType(curRowType, isColumnId))
+                        .build());
+        return unfold;
+    }
+
     private List<RexGraphVariable> getLeftRightVariables(RexNode condition) {
         List<RexGraphVariable> vars = Lists.newArrayList();
         if (condition instanceof RexCall) {

interactive_engine/compiler/src/main/java/com/alibaba/graphscope/common/ir/tools/GraphBuilder.java

@@ -1655,6 +1655,20 @@ public GraphBuilder dedupBy(Iterable<? extends RexNode> nodes) {
         return this;
     }
 
+    public GraphBuilder unfold(RexNode unfoldKey, @Nullable String aliasName) {
+        RelNode input = requireNonNull(peek(), "frame stack is empty");
+        RelDataType keyType = unfoldKey.getType();
+        Preconditions.checkArgument(
+                keyType.getComponentType() != null,
+                "input type of 'unfold' should be set or array with single component type, but is"
+                        + " [%s]",
+                keyType);
+        GraphLogicalUnfold unfold =
+                new GraphLogicalUnfold((GraphOptCluster) getCluster(), input, unfoldKey, aliasName);
+        replaceTop(unfold);
+        return this;
+    }
+
     @Override
     public RelBuilder join(
             JoinRelType joinType, RexNode condition, Set<CorrelationId> variablesSet) {

interactive_engine/compiler/src/main/java/com/alibaba/graphscope/common/ir/tools/GraphRexBuilder.java

@@ -81,8 +81,15 @@ public RexNode makeIn(RexNode arg, List<? extends RexNode> ranges) {
                         makeSearchArgumentLiteral(sarg, sargType));
             }
         }
-        if (ranges.size() == 1 && ranges.get(0).getKind() == SqlKind.DYNAMIC_PARAM) {
-            return makeCall(GraphStdOperatorTable.IN, arg, ranges.get(0));
+        if (ranges.size() == 1) {
+            RexNode range = ranges.get(0);
+            switch (range.getKind()) {
+                    // right operand is a dynamic parameter ( name in $names ), or a variable ( name
+                    // in names )
+                case DYNAMIC_PARAM:
+                case INPUT_REF:
+                    return makeCall(GraphStdOperatorTable.IN, arg, ranges.get(0));
+            }
         }
         return RexUtil.composeDisjunction(
                 this,

interactive_engine/compiler/src/main/java/com/alibaba/graphscope/common/ir/tools/GraphStdOperatorTable.java

@@ -297,7 +297,7 @@ public static final SqlFunction USER_DEFINED_PROCEDURE(StoredProcedureMeta meta)
                     true,
                     ReturnTypes.BOOLEAN_NULLABLE,
                     GraphInferTypes.IN_OPERANDS_TYPE,
-                    OperandTypes.ANY);
+                    GraphOperandTypes.ANY_ANY);
 
     public static final SqlOperator PATH_CONCAT =
             new SqlFunction(

interactive_engine/compiler/src/main/java/com/alibaba/graphscope/cypher/antlr4/visitor/GraphBuilderVisitor.java

@@ -63,6 +63,13 @@ public GraphBuilder visitOC_Cypher(CypherGSParser.OC_CypherContext ctx) {
         return visitOC_Statement(ctx.oC_Statement());
     }
 
+    @Override
+    public GraphBuilder visitOC_Unwind(CypherGSParser.OC_UnwindContext ctx) {
+        RexNode expr = expressionVisitor.visitOC_Expression(ctx.oC_Expression()).getExpr();
+        String alias = ctx.oC_Variable() == null ? null : ctx.oC_Variable().getText();
+        return builder.unfold(expr, alias);
+    }
+
     @Override
     public GraphBuilder visitOC_Match(CypherGSParser.OC_MatchContext ctx) {
         int childCnt = ctx.oC_Pattern().getChildCount();

interactive_engine/compiler/src/main/java/org/apache/calcite/sql/type/GraphOperandTypes.java

@@ -74,6 +74,9 @@ public abstract class GraphOperandTypes {
     public static final SqlSingleOperandTypeChecker INTERVALINTERVAL_INTERVALDATETIME =
             OperandTypes.or(INTERVAL_SAME_SAME, INTERVAL_DATETIME);
 
+    public static final SqlSingleOperandTypeChecker ANY_ANY =
+            family(SqlTypeFamily.ANY, SqlTypeFamily.ANY);
+
     /**
      * create {@code RexFamilyOperandTypeChecker} to validate type based on {@code RexNode}
      * @param families

interactive_engine/compiler/src/test/java/com/alibaba/graphscope/common/ir/planner/cbo/BITest.java

@@ -212,6 +212,56 @@ public void bi3_test() {
                 com.alibaba.graphscope.common.ir.tools.Utils.toString(after).trim());
     }
 
+    @Test
+    public void bi4_test() {
+        GraphBuilder builder = Utils.mockGraphBuilder(optimizer, irMeta);
+        RelNode before =
+                com.alibaba.graphscope.cypher.antlr4.Utils.eval(
+                                "MATCH (forum:FORUM)\n"
+                                    + "WITH collect(forum) AS topForums\n"
+                                    + "UNWIND topForums AS topForums1\n"
+                                    + "MATCH"
+                                    + " (topForums1:FORUM)-[:CONTAINEROF]->(post:POST)<-[:REPLYOF*0..10]-(message:POST|COMMENT)-[:HASCREATOR]->(person:PERSON)<-[:HASMEMBER]-(topForums2:FORUM)\n"
+                                    + "WHERE topForums2 IN topForums\n"
+                                    + "RETURN\n"
+                                    + "  person.id AS personId\n"
+                                    + "  ORDER BY\n"
+                                    + "  personId ASC\n"
+                                    + "  LIMIT 100;",
+                                builder)
+                        .build();
+        RelNode after = optimizer.optimize(before, new GraphIOProcessor(builder, irMeta));
+        Assert.assertEquals(
+                "GraphLogicalSort(sort0=[personId], dir0=[ASC], fetch=[100])\n"
+                    + "  GraphLogicalProject(personId=[person.id], isAppend=[false])\n"
+                    + "    LogicalJoin(condition=[AND(=(topForums1, topForums1), IN(topForums2,"
+                    + " topForums))], joinType=[inner])\n"
+                    + "      GraphLogicalUnfold(key=[topForums], alias=[topForums1])\n"
+                    + "        GraphLogicalAggregate(keys=[{variables=[], aliases=[]}],"
+                    + " values=[[{operands=[forum], aggFunction=COLLECT, alias='topForums',"
+                    + " distinct=false}]])\n"
+                    + "          GraphLogicalSource(tableConfig=[{isAll=false, tables=[FORUM]}],"
+                    + " alias=[forum], opt=[VERTEX])\n"
+                    + "      GraphPhysicalExpand(tableConfig=[{isAll=false, tables=[HASMEMBER]}],"
+                    + " alias=[topForums2], startAlias=[person], opt=[IN], physicalOpt=[VERTEX])\n"
+                    + "        GraphPhysicalExpand(tableConfig=[{isAll=false,"
+                    + " tables=[HASCREATOR]}], alias=[person], startAlias=[message], opt=[OUT],"
+                    + " physicalOpt=[VERTEX])\n"
+                    + "          GraphLogicalGetV(tableConfig=[{isAll=false, tables=[POST,"
+                    + " COMMENT]}], alias=[message], opt=[END])\n"
+                    + "           "
+                    + " GraphLogicalPathExpand(fused=[GraphPhysicalExpand(tableConfig=[{isAll=false,"
+                    + " tables=[REPLYOF]}], alias=[_], opt=[IN], physicalOpt=[VERTEX])\n"
+                    + "], fetch=[10], path_opt=[ARBITRARY], result_opt=[END_V], alias=[_],"
+                    + " start_alias=[post])\n"
+                    + "              GraphPhysicalExpand(tableConfig=[{isAll=false,"
+                    + " tables=[CONTAINEROF]}], alias=[post], startAlias=[topForums1], opt=[OUT],"
+                    + " physicalOpt=[VERTEX])\n"
+                    + "                GraphLogicalSource(tableConfig=[{isAll=false,"
+                    + " tables=[FORUM]}], alias=[topForums1], opt=[VERTEX])",
+                after.explain().trim());
+    }
+
     @Test
     public void bi5_test() {
         GraphBuilder builder = Utils.mockGraphBuilder(optimizer, irMeta);